Sparcraft FM-580 Mast

NG2 Masthead Sheave: NG2-3: Factory standard Acetyl Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 22mm (7/8") ID.
NG2 Masthead Sheave - Aluminum: NG2-3A: Anodized Aluminum Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 22mm (7/8") ID, and is much sturdier than the plastic version.
*NG2 Long (Forward) Masthead Sheave Axle: NG2-6L:* Long SS 'Drop-in' Tubular Masthead Sheave Axle is 22mm (7/8") OD x 81mm (3 1/4") long. Hollow Axle fits in Forward side of NG2 Masthead and supports 4 Jib/Spinnaker Halyard Sheaves (NG2-3 or *NG2-3A*).
*NG2 Short (Aft) Masthead Sheave Axle: NG2-6S:* Short SS 'Drop-in' Tubular Masthead Sheave Axle is 22mm (7/8") OD x 46mm (1 3/4") long. Hollow Axle fits in Aft side of NG2 Masthead and supports 2 Main Halyard Sheaves (NG2-3 or *NG2-3A*).
*NG2 Masthead Clevis Pin: NG2-6P:* SS Clevis Pin is used in NG2 Masthead for attachment of topping lift, lazy jacks, or other items. This item is not standard on all masts and your Masthead may not have a hole drilled for this Pin, but, if not drilled, hole position is marked by an indent. Masthead can be easily drilled to add this item if required. Clevis Pin is 8mm (5/16") diameter with a 52mm (2 1/16") grip length. CPM8-52

French Extruded Masthead Parts FM-580 Masts produced in France commonly use a variety of 6 different Extruded Mastheads. Parts common to most French Extruded Mastheads are listed below. For complete Masthead Assemblies and Parts not listed, Please contact us with full details.

	FM2 Masthead Sheave - 80mm: SM80R15-12: Turned Delrin Sheave is 80mm (3 3/16") OD x 15mm (<5/8") wide x 12mm (7/16") ID.
	FM2 Masthead Sheave Axle Clevis Pin: FM2-6P: SS Clevis Pin is used as a Sheave Axle in some FM2 Double Channel Extruded Mastheads. Clevis Pin is 12mm (<1/2") diameter with a 52mm (2") grip length. CPM12-52
	Double Masthead Spinnaker Bail: FM2-2: Double Masthead Spinnaker Bail is cut from 5mm SS plate and attaches to the top of the masthead with (6) 6mm (1/4") screws and locknuts. Plate has (2) slots (7/8" x 7/16") for attachment of any Swivel Blocks. Plate is (maximum) 3 3/4" long x 4 1/4" wide. Screw holes are in 2 rows, 7/8" apart. Mounting requires drilling (6) 1/4" holes.

US Extruded Masthead Parts FM-580 Masts produced in the US commonly use a variety of different Extruded FM2C and NG2 Mastheads. FM2C Mastheads are easily identifiable by their use of 'Drop-in' Sheave Axles. NG2 Extruded Mastheads use Clevis Pins, or Sheave Axle Pins with Tab, as Sheave Axles. Parts common to most US-manufactured Mastheads are listed below. For complete Masthead Assemblies and Parts not listed, Please contact us with full details.
Sheaves and Axles for US Mastheads using 22mm Sheave Axles.

	FM2C Masthead Sheave w/ 22mm ID: NG2-3: Factory standard Acetyl Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 22mm (7/8") ID. Med C MHO
	FM2C Masthead Sheave w/ 22mm ID - Alu.: NG2-3A: Anodized Aluminum Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 22mm (7/8") ID, and is much sturdier than the plastic version.
	FM2C Masthead Sheave Axle - 22mm: NG2-6S: SS 'Drop-in' Tubular Sheave Axle pin is used in some FM2C Double Channel Extruded Mastheads. 'Drop-in' Sheave Axle pin is 22mm (7/8") diameter x 46mm (1 13/16") long, and is used with NG2-3 or *NG2-3A* Sheaves.

Sheaves and Axles for US Mastheads using 12mm Sheave Axles.

	FM2C Masthead Sheave w/ 12mm ID: NG2-3B12: Acetyl Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 12mm (7/16") ID. As NG2-3, above, with a Bushing to reduce the ID to 12mm. Med C MHN
	FM2C Masthead Sheave w/ 12mm ID - Aluminum: NG2-3AB12:
	Anodized Aluminum Sheave is 85mm (3 3/8") x 15mm (5/8") wide x 12mm (7/16") ID. As NG2-3A, above, with a Bushing to reduce the ID to 12mm.
	FM2C Masthead Sheave Axle - 12mm: FM2C-6P: SS 'Drop-in' Sheave Axle pin is used in FM2C Double Channel Extruded Mastheads. 'Drop-in' Sheave Axle pin is 12mm (<1/2") diameter x 50.5mm (2") long.

Parts Common to all FM2C Mastheads

	*FM2C Masthead Toggle w/ 1/2" Pin: K-10469H:* Heavy-Duty Slotted SS Masthead Toggle used in FM2C Masthead is formed to sit on 5/8" cross-pin going through masthead channel, and *includes 1/2" (lower) Clevis Pin, CP8-42.* Toggle measures 1 1/2" (38mm) wide x 1/4" thick, with 2 1/4" between pin centers, and will accommodate eyes up to 5/8" thick. Slot is 3/8" wide x 2" deep.
	*FM2C Masthead Toggle w/ 5/8" Pin: K-10469H-1:* Heavy-Duty Slotted SS Masthead Toggle used in FM2C Masthead is formed to sit on 5/8" cross-pin going through masthead channel, and *includes 5/8" (lower) Clevis Pin, CP10-42M.* Toggle measures 1 1/2" (38mm) wide x 1/4" thick, with 2 1/4" between pin centers, and will accommodate eyes up to 5/8" thick. Slot is 3/8" wide x 2" deep.
	FM2C Masthead Toggle Attachment Pin - 5/8": CP10-80:
	SS Clevis Pin is used in FM2C Masthead for attachment of Headstay and Backstay Toggles. Toggle attachment Pin is 5/8" (16mm) diameter with a 2 1/2" (64mm) grip length.
	*FM2C Masthead Clevis Pin - 1/2" x 2 1/2": CP8-80:* SS Clevis Pin is used in FM2C Masthead for attachment of topping lift, lazy jacks, or other items. Clevis Pin is 5/8" (16mm) diameter with a 2 1/2" (64mm) grip length.
	*FM2C Masthead Cover Plate: FM2C-CP:* Masthead Cover Plate is used on FM2C Masthead to cover and contain Sheaves and halyards. Anodized Aluminum Cover Plate is 10 1/4" long x 3" wide x 1/8" thick, with 3/16" holes for 10-24 screws on opposing corners.
	FM2C Spinnaker Crane Doubler Plate: FM2C-DP: Doubler Plate is used on FM2C Masthead to reinforce Masthead where Spinnaker Crane U-bolts are mounted. Anodized Aluminum Doubler Plate is 2" long x 7" wide x 3/8" thick, with 10mm mounting holes for Masthead Spinnaker Crane U-bolts, FM2C-2U. Med C MH 3001.316.7403.
	Masthead Spinnaker Crane U-bolt - 10mm: FM2C-2U: SS U-bolt assembly is 10mm (3/8") diameter x 2 1/2" LOA x 1 1/4" ID (1 5/8" centers). Comes with (2) SS nuts for underside of Masthead, and (2) SS Locknuts for upper side. mc-a

FM-580 Mast – Tangs A wide variety of Tangs are used on the FM-580 Mast Section, but most commonly used are Stemball Backing Shell Tangs. See also, other Tangs.

FM-580 Mast – Jib Boxes & Forestay Attachments Several other varieties of Jib Boxes and Forestay Attachments are used on the FM-580 Mast Section, See Isomat Jib Boxes and Forestay/Staysail Tangs.
*NG2 Jib Box Ass'y w/ Toggle - 12mm Pin: NG2-30-12A:* *NG2 Jib Box Ass'y w/ Toggle - 14mm Pin: NG2-30-14A:* *NG2 Jib Box Ass'y w/ Toggle - 16mm Pin: NG2-30-16A:* Cast aluminum Jib Box and Forestay Toggle Assembly is designed to be welded in Mast Section. Unit provides a single sheave for an internal Jib or Staysail halyard up to 5/8" diameter and a secure attachment point for Forestays up to 3/8" (10mm) diameter. Assembly uses an 85mm (3 3/8") Acetyl Sheave (NG2-4-16) on a 16mm Axle, (NG2-6B). Toggle mounts on removable 19mm Clevis Pin which can be used to mount optional Spinnaker halyard Spectacle Assembly (NG2-31S), below. Stainless Steel Toggle with Pin (in various pin sizes) is included. Other Pin sizes (1/2" - 5/8") are available, please specify. 12-000055
	NG2 Jib Box Sheave: NG2-4-16: Acetyl Sheave is 85mm (3 3/8") OD x 20mm (3/4") wide x 16mm (5/8") ID.
	NG2 Jib Box Sheave Axle: NG2-6B: SS 'Drop-in' Sheave Axle pin is 16mm (5/8") diameter x 29.5mm (1 5/32") long. 1104
	*NG2 Jib Box Toggle, 12mm Pin: NG2-30-12T:* *NG2 Jib Box Toggle, 14mm Pin: NG2-30-14T:* *NG2 Jib Box Toggle, 16mm Pin: NG2-30-16T:* Stainless Steel Forestay Toggle for use with NG2 Cast Jib Box. Toggle rides on 19mm Pin in casting, lower Clevis pin (in various sizes) is included. Other Pin sizes (1/2" - 5/8") are available, please specify.
	*NG2 Jib Box Toggle Attachment Pin: NG2-30P:* SS Clevis Pin is used in NG2 Cast Jib Box for attachment of Forestay Toggle. Clevis Pin is 19mm (3/4") diameter with a 52mm (2 1/16") grip length. Single Pin is also used for attachment of optional Spinnaker halyard Spectacle Assembly (NG2-31S), below. CPM19-52
	NG2 Jib Box Spinnaker Spectacles: NG2-31S: Optional SS Spectacle Assembly for NG2 Cast Jib Box allows for two (2) Spinnaker halyards and mounts easily on Jib Box Toggle Pin. Cast Stainless 'eyes' are smoothly faired to minimize chafe on halyards up to 1/2" diameter. Spinnaker halyards exit mast through staggered Exit Blocks mounted several feet above Jib Box Assembly and go straight down through Spectacle 'eyes' and forward. 562109

FM-580 Mast – Exit Blocks Several varieties of Exit Blocks are used on the FM-580 Mast Section, See Isomat Exit Blocks.

FM-580 Mast – Spreaders The FM-580 Mast Section is commonly used with BF-3 Spreaders, and BF-4 Spreaders. For Spreaders, Spreader Parts, and Spreader Bars and Bases not listed here, See Sparcraft Spreaders & Components.

FM-580 Mast – Spreader Bases The FM-580 Mast Section is commonly used with Cast SS Spreader Bars, listed below. Other Spreader Bars and Bases have been used, See Sparcraft Spreaders & Components. Early FM-580 Masts used Francespar Spreaders and stamped SS Spreader Bases that are no longer available.
*SS Spreader Bar for FM-580 & BF-3 Spreader: BF3-43-121:*
New-style cast SS Spreader Bar for FM-580 Mast and BF3 Spreaders incorporates seats for NG1 wire or rod Stemballs and is suitable for Spreaders angled up to 25° aft. SS Spreader Bar is (maximum) 1.275" (32.5mm) high x 2 3/4" (70.5mm) wide, and incorporates a 5 degree vertical angle; length of center section is 121mm. This item requires a contoured cut-out in the Mast wall. Cast SS Spreader Bar is available in a variety of other lengths for use with other Mast Sections from FM135 - FM580. For Spreaders, Spreader Parts, and other Spreader Bars and Bases, See BF-3 Spreaders & Components. sbsl=1
	Spreader Base Clevis Pin: BF3-30: Attaches BF3 Spreader to SS Spreader Bar. SS Clevis Pin is 8mm diameter x 32mm (1 1/4") long. Two (2) Required per Spreader.
	*Doubler Plate for BF-3 SS Spreader Bar: BF3-43F:* Formed Aluminum Doubler Plate is contoured to fit the mast section and reinforces it for use with any size BF3-43 SS Spreader Bar. Plate is (maximum) 4 3/8" (112mm) long x 2 9/16" (65mm) high. Slot in plate is (maximum) 2 3/4" (70.5mm) long x 1.3" (32.5mm) high. Plates (2 required) are attached to the mast with (4) 1/4" (6mm) rivets. For use with Mast Sections from FM135 - FM580, and others. +52893

*SS Spreader Bar for FM-580 & BF-4 Spreader: BF4-43-121:*
New-style cast SS Spreader Bar for FM-580 Mast and BF4 Spreaders incorporates seats for NG1 wire or rod Stemballs and is suitable for Spreaders angled up to 25° aft. SS Spreader Bar is (maximum) 1 3/8" (35mm) high x 3 5/8" (93mm) wide, and incorporates a 5 degree vertical angle; length of center section is 121mm. This item requires a contoured cut-out in the Mast wall, and is available in a variety of lengths for use with other Mast Sections from FM385 - FM1060. For Spreaders, Spreader Parts, and other Spreader Bars and Bases, See BF-4 Spreaders & Components. sbsl=1
	Spreader Base Clevis Pin - 12mm: BF4-30: Attaches BF4 Spreader to standard Spreader Bar or Base. SS Clevis Pin is 12mm diameter x 38mm (1 1/2") long. Two (2) Required per Spreader.
	*Doubler Plate for BF-4 SS Spreader Bar: BF4-43F:* Formed Aluminum Doubler Plate is contoured to fit the mast section and reinforces it for use with any size BF4-43 SS Spreader Bar. Plate is (maximum) 5 5/8" (144mm) long x 3" (77mm) high. Slot in plate is (maximum) 3 5/8" (93mm) long x 1 3/8" (35mm) high. Plates (2 required) are attached to the mast with (6) 3/16" (5mm) rivets. Used with FM385-1060 Mast Sections. +52903

FM-580 Mast – Spinnaker Cars Spinnaker Cars on the FM-580 Mast Section, normally run of one of several sizes of added T-Track, See Spinnaker Cars for T-Track.
Spinnaker Car only, w/ Tow Shackles: FM 32TC-T: *Spinnaker Car only, w/ Pin Stop: FM 32TC-P:* Spinnaker Car only for 32mm T-Track, as used in a wide variety configurations. Chrome-plated cast Bronze slide has plastic liners to minimize friction and is available with towing shackles, OR with Spring Pin Stop. Car is (maximum) 4 5/8" long x 1 13/16" wide, and accepts Toggle up to 1 1/2" (39mm) high using a 10mm Pin. Includes plastic liners, FM 32TC-LP. Spinnaker Car fits 1 1/4" and 32mm T-Track. Also available Complete with various Bell and Toggle Assemblies, See: Spinnaker Cars for 1 1/4" T-Track.
	Liners for FM 32TC Spinnaker Car: FM 32TC-LP:
	Replacement Liners for *FM 32TC* Spinnaker Cars are sold in pairs only. Black Plastic Liners are (maximum) 3 9/16" (90mm) long. Fits into slot on Car that is 3/8" wide x 3 3/8" long.
	End Stop for 32mm T-Track: FM 32T-ESB:
	End Stop for 32mm x 5.5mm T-Track attaches to Mast with 8mm FH screw. Black Plastic End Stop projects (maximum) 32mm (1 1/4") from Track end.
FM2 Spinnaker Pole Mast Eye: FM2-37: Fixed Eye for attachment of whisker or spinnaker pole on the front of the mast. Used where vertical adjustment of inboard pole end is not required, Cast SS Pole eye is curved to fit the front of the Mast. Base is 58mm (2 1/4") square, and attaches to Mast with (4) 1/4" screws or rivets. 10mm Ring has 50mm (2") ID. Used with FM-305 and larger Mast Sections. Part is marked 33501000104.

FM-580 Mast – Exit Plates Several varieties of Exit Plates are used on the FM-580 Mast Section, See Isomat Exit Plates.

FM-580 Mast – Cleats Several sizes of Cleats are used on the FM-580 Mast Section, See Isomat Cleats.

FM-580 Mast – Mainsail Gates & Feeders
FM3 Aluminum Mainsail Gate & Screw Kit: FM3-9K: Cast aluminum Mainsail Gate Kit fits FM-580 through FM-3360 Mast Sections. Gate has slot for Thumbscrews, NGA-10; Gate is 'opened' by loosening Thumbscrews and sliding gate up and over. Kit includes Gate casting, FM3-9, and (2) SS Thumbscrews, NGA-10.
	FM3 Aluminum Mainsail Gate: FM3-9: Cast aluminum Mainsail Gate only, as in Kit FM3-9K, above. Gate casting is 3 5/16" (85mm) high x (maximum) 2" (50mm) wide.
	NG1 Mainsail Gate Screw: NGA-10: SS Thumbscrew is 4mm diameter with 5/8" (15mm) long thread and has serrated plastic head.
	NG1 Mainsail Gate Screw - All Stainless: NGA-10SS: All Stainless Thumbscrew is 4mm diameter with 5/8" (15mm) long thread and knurled head.
FM2 SS Short Mainsail Gate & Screw Kit: FM2-9S-SK: Formed SS Short Mainsail Gate Kit fits FM-135 through FM-3360 Mast Sections. Gate is 2 3/8" long, and has horizontal slots for Thumbscrews, Gate is 'opened' by loosening Thumbscrews and sliding gate away from Mainsail track. SS Short Gate is 2 3/8" (60mm) high x 1 5/16" (36mm) wide, slots are on 1 5/8" (41mm) centers. Kit includes SS Short Gate, FM2-9S-S, and (2) SS Thumbscrews, NGA-10.
FM2 SS Long Mainsail Gate & Screw Kit: FM2-9S-LK: Formed SS Long Mainsail Gate Kit fits FM-135 through FM-3360 Mast Sections. Gate is 3" long, and has horizontal slots for Thumbscrews, Gate is 'opened' by loosening Thumbscrews and sliding gate away from Mainsail track. SS Long Gate is 3" (76mm) high x 1 5/16" (36mm) wide, slots are on 1 5/8" (41mm) centers. Kit includes SS Long Gate, FM2-9S-L, and (2) SS Thumbscrews, NGA-10.
FM2 SS Mainsail Slide Stop: FM2-10A: SS Mainsail Gate Slide Stop fits FM-135 through FM-3360 Mast Sections and all mast sections with track for 7/8" or 15/16" internal flat slides. Design allows Slide Stop to remain captive in mast track. Gate cutout (1 3/4" high) is made 2" above Gooseneck bracket. Thumbscrews fits in 1/4" holes drilled at top of cutout, and slides down into recess beneath Gooseneck Bracket when Thumbscrews are loosened. This design allows sail slides to come as close as possible to the gooseneck while remaining in track, and eliminates problems associated with slides snagging while going past a normal sail gate. Investment cast SS Slide is 100mm (4") long x 24.5mm (15/16") wide, assembly includes (2) Thumbscrews, NGA-10. Part is marked 34211690154.

FM2 Large Boltrope Feeder: FM2-BRF: SS Boltrope Feeder fits FM-305 through FM-580, and other Mast Sections. Cast SS Feeder is 3 1/2" (88mm) long x (maximum) 2 1/4" (58mm) wide and attaches to mast with (6) 3/16" (5mm) rivets on 44mm x 37mm vertical centers. Unit requires 75mm x 16mm cut-out in the Mast track. Part is marked 34203000054.

AutoReef Fairlead
*AutoReef Fairlead: NGA-65:* SS AutoReef Fairlead is mounted on either side of mast above gooseneck bracket. Acts as fairlead for reef line and stop for sail when reefed with AutoReef (single line) reefing system. Flattened SS ring is welded to diamond shaped SS plate. Ring is 32mm (1 1/4") OD x 16mm (5/8") ID, plate is 65mm (5/8") high x 40mm (1 5/8") wide and is fastened with four (4) 1/4" (6mm) rivets. For details, See: Isomat AutoReef System.

FM-580 Mast - Gooseneck Brackets & Hardware The FM-580 Mast Section is used with FM2 and NG2 Gooseneck Brackets for Booms FB220 and larger.

NG2 Gooseneck Bracket: NG2-12: Cast aluminum Gooseneck Bracket fits a variety of FM and NG Mast Sections for use with FB220 and larger Booms. It is compatible with all FB Gooseneck Toggles that use a 14mm Vertical Pin. Bracket is 4 3/4" (120mm) high x 3 1/2" (90mm) wide, and is fastened with eight (8) 1/4" (6mm) rivets. Bracket has 22mm (7/8") hole at top and 14mm (9/16") hole on bottom side, requiring the use of NG2-13 Bushing when used with any of the 14mm Vertical Gooseneck Pins.
NG2 Gooseneck/ Vang Toggle Pin Ass'y: NG2-14A: 14mm Pin Assembly converts Bracket, NG2-12, for use with any FB Gooseneck Toggles that use a 14mm Vertical Pin. Includes Toggle Pin, NG2-14, Gooseneck Bushing, NG2-13, washers and SS Cotter Ring.
	NG2 Gooseneck Bushing: NG2-13: SS Bushing is used in upper hole of NG2-12 Gooseneck Bracket to adapt it for use with FM2 or NG2 14mm Toggle Pins. Bushing is 22mm (7/8") OD x 14mm (9/16") ID x 16mm (5/8") long.
	NG2 Gooseneck/ Vang Toggle Pin: NG2-14: SS Clevis Pin is 14mm (9/16") diameter with a 125mm (5") grip length, and has 8mm (5/16") hole for Cotter Ring, Shackle, or Block attachment. Fits vertically in NG2-12 and FM2-11 Brackets.
FM2 Gooseneck Bracket for 14mm Pin: FM2-11: FM2 Gooseneck Bracket for 14mm Pin w/ 'T': FM2-11T: Extruded aluminum Gooseneck Mast Bracket is used on a variety of FM Mast Sections for use with FB220 and larger Booms. It is compatible with all FB Gooseneck Toggles that use a 14mm Pin. Bracket is 4 3/8" (112mm) high x 3 1/2" (90mm) wide, and is fastened with eight (8) 3/16" (5mm) rivets and (2) 1/4" (6mm) FH screws. Note that fastener holes are commonly drilled out for use w/ 1/4" (6mm) rivets. FM2-11T* Bracket is as FM2-11, but with an integral 'T' on the back side (24mm (15/16") wide), requiring that the Mast (FM-580 and larger) be down for installation. Bracket has a 14mm (9/16") hole for use with any of the FB2 Vertical Gooseneck Pins and FB2 Gooseneck Toggles, below.
	FB2 Gooseneck Pin Ass'y w/ Reef Hooks: FB2-1A: 14mm Vertical Gooseneck Toggle Pin Assembly is used to attach the FB2-412 or FB2-414 Gooseneck Toggles to NG2-12 and FM2-11 Mast Brackets. SS Gooseneck Pin Assembly has (2) integral 10mm Reef Hooks and includes Tack Shackle NB2-2, washers and 14mm SS Locknut. Unit is 14mm (9/16") diameter x 135mm (5 3/8") long (under head).
	FB2 Gooseneck Pin Ass'y w/ Shackle: FB2-1ARA: 14mm Vertical Gooseneck Toggle Pin Assembly is used to attach the FB2-412 or FB2-414 Gooseneck Toggles to NG2-12 and FM2-11 Mast Brackets. SS Gooseneck Pin Assembly includes Tack Shackle NB2-2, washers and 14mm SS Locknut. Unit is 14mm (9/16") diameter x 135mm (5 3/8") long (under head).
	FB2 Vertical Gooseneck/Vang Pin: FB2-1BA: 14mm Vertical Gooseneck Toggle Pin with washers and Locknut only. As FB2-1ARA assembly, above, but without Shackle. SS Gooseneck Pin is 14mm (9/16") diameter x 135mm (5 3/8") long (under head).
	FB2 Tack Shackle: NB2-2: SS Tack Shackle fits through hole in top of FB2-1 Vertical Gooseneck Toggle Pins. Shackle has 8mm (5/16") pin, throat width is 22mm (7/8").
	Screw Pin for NB2-2 Tack Shackle: NB2-2SP: Replacement Screw Pin only for NB2-2 Tack Shackle. Screw Pin has 8mm thread.
	FB2 Gooseneck Pin w/ Tack Pin & Loops: FB2-1ARL: 14mm Vertical Gooseneck Toggle Pin Assembly is used to attach the FB2-412 or FB2-414 Gooseneck Toggles to NG2-12 and FM2-11 Mast Brackets. SS Gooseneck Pin Assembly includes welded side loops, 8mm (5/16") Tack Pin, washers and 14mm SS Locknut. Unit is 14mm (9/16") diameter x 135mm (5 3/8") long (under head).
	FB2 Gooseneck Toggle for 12mm Horizontal Pin: FB2-412:
	Cast Aluminum Gooseneck Toggle is used on FB-220 and FB-550 Booms to attach to FM2-11 and NG2-12 Gooseneck Brackets, using any of the FB2-1 Vertical Gooseneck Pins, above. Toggle is 2 3/4" (69mm) high x 1 1/2" (37mm) wide x 3 3/8" (86mm) long, with holes for 14mm Vertical and 12mm Horizontal pins, on 2" (50mm) centers. Anodized Toggle features central hole for cotter pin to secure Horizontal Pin.
	FB2 Gooseneck Toggle for 14mm Horizontal Pin: FB2-414:
	Cast Aluminum Gooseneck Toggle is used on FB-810 and larger Booms to attach to FM2-11 and NG2-12 Gooseneck Brackets, using any of the FB2-1 Vertical Gooseneck Pins, above. Anodized Toggle is 2 3/4" (69mm) high x 1 1/2" (37mm) wide x 3 3/8" (86mm) long, with holes for 14mm Vertical and 14mm Horizontal pins, on 2" (50mm) centers.

FM-580 Mast – Winch Pads
*FM-580 Side Winch Pad - Clear Anodized: FM580-20:* Formed aluminum Bracket fits either side of FM-580 Mast Section. Winch mounting surface on Bracket is 6 1/4" (160mm) high x 6 1/2" (165mm) wide. Anodized Bracket is 3/16" (5mm) thick and fastens to Mast with eight (8) 1/4" (6mm) rivets. 740,S622,830
FM-580 Aft Winch Pad - Clear Anodized: NG46-21: Formed aluminum Bracket fits aft side of FM-580 Mast Section. Designed to mount under the Boom for use with a Reef line winch. Winch mounting surface on Bracket is 4 3/4" (120mm) high x 4 3/8" (112mm) wide and angles aft approximately 12 degrees to align Winch with Outhaul or Reef lines exiting from Boom. Anodized Bracket is 3/16" (5mm) thick and fastens to Mast with eight (8) 1/4" (6mm) rivets. I330,46,51

FM-580 Mast - Vang Brackets & Hardware Vang Brackets & Toggles used on the FM-460 Mast Section are listed below. Gooseneck Brackets, above, are also used as Vang Brackets. For other Vang Toggles used with these Brackets, See NG2 Vang Toggles. See also Isomat/ Sparcraft Solid Vangs.
NG2 Gooseneck/ Vang Bracket: NG2-12: Cast aluminum Vang Bracket fits a variety of FM and NG Mast Sections for use with all NG2 Vang Toggles that use a 14mm Vertical Pin. Bracket is 4 3/4" (120mm) high x 3 1/2" (90mm) wide, and is fastened with eight (8) 1/4" (6mm) rivets. Bracket has 22mm (7/8") hole at top and 14mm (9/16") hole on bottom side, requiring the use of NG2-13 Bushing.
NG2 Gooseneck/ Vang Toggle Pin Ass'y: NG2-14A: Assembly converts Bracket, NG2-12, for use with any FB Gooseneck Toggles that use a 14mm Vertical Pin. Includes Toggle Pin, NG2-14, NG2 Gooseneck Bushing, NG2-13, and SS Cotter Ring.
	NG2 Gooseneck Bushing: NG2-13: SS Bushing is used in upper hole of NG2-12 Gooseneck Bracket to adapt it for use with FM2 or NG2 14mm Toggle Pins. Bushing is 22mm (7/8") OD x 14mm (9/16") ID x 16mm (5/8") long.
	NG2 Gooseneck/ Vang Toggle Pin: NG2-14: SS Clevis Pin is 14mm (9/16") diameter with a 125mm (5") grip length, and has 8mm (5/16") hole for Cotter Ring, Shackle, or Block attachment. Fits vertically in NG2-12 and FM2-11 Brackets.
FM2 Vang Bracket Ass'y for 14mm Pin: FM2-11-VBS: FM2 Vang Bracket Ass'y for 14mm Pin w/ 'T': FM2-11T-VBS:
Mast Vang Bracket Assembly has 14mm Pin hole for use with Sparcraft Pneuvang. Standard Assembly includes Mast Bracket FM2-11, Vertical Pin Assembly with shackle, FB2-1ARA, and *NG2-18S* Vang Toggle. Assembly with FM2-11T* Bracket is recommended for use on* FM-580 and larger FM Mast Sections, but 'T' requires the Mast be down for installation. Bracket is fastened with eight (8) 3/16" (5mm) rivets and (2) 1/4" (6mm) FH screws. Note that fastener holes are commonly drilled out for use w/ 1/4" (6mm) rivets. Bracket is also compatible with other NG2* Vang Toggles, below.
FM2 Vang Bracket for 14mm Pin: FM2-11: FM2 Vang Bracket for 14mm Pin w/ 'T': FM2-11T: Extruded aluminum Gooseneck/Vang Mast Bracket is used on a variety of FM Mast Sections. It accepts a 14mm Vertical Pin and is compatible with all NG2 Vang Toggles. Bracket is 4 3/8" (112mm) high x 3 1/2" (90mm) wide, and is fastened with eight (8) 3/16" (5mm) rivets and (2) 1/4" (6mm) FH screws. Note that fastener holes are commonly drilled out for use w/ 1/4" (6mm) rivets. FM2-11T* Bracket is as FM2-11, but for use on FM-580 and larger FM Mast Sections. FM2-11T Bracket is strengthened with an integral 'T' on the back side (24mm (15/16") wide), but 'T' requires the Mast be down for installation. Bracket is compatible with a variety of NG2 Vang Toggles, below.
FB2 Vertical Gooseneck/Vang Pin Ass'y: FB2-1ARA: 14mm Vertical Gooseneck/Vang Toggle Pin Assembly with Shackle is used to attach various Vang Toggles to FM2-11 and NG2-12 Mast Brackets. SS Gooseneck Pin is 14mm (9/16") diameter x 135mm (5 3/8") long (under head), and threaded on the bottom. Assembly includes Shackle NB2-2, washers and 14mm SS Locknut.
	FB2 Vertical Gooseneck/Vang Pin: FB2-1BA: 14mm Vertical Gooseneck Toggle Pin with washers and Locknut only. As FB2-1ARA assembly, above, but without Shackle. SS Gooseneck Pin is 14mm (9/16") diameter x 135mm (5 3/8") long (under head).
	FB2 Tack Shackle: NB2-2: SS Tack Shackle fits through hole in top of FB2-1 Vertical Gooseneck Toggle Pins. Shackle has 8mm (5/16") pin, throat width is 22mm (7/8").
	Screw Pin for NB2-2 Tack Shackle: NB2-2SP: Replacement Screw Pin only for NB2-2 Tack Shackle. Screw Pin has 8mm thread.
*NG2 SS Vang Toggle w/ hole for 1/2" Pin: NG2-17-12:* *NG2 SS Vang Toggle w/ hole for 5/8" Pin: NG2-17-16:* SS Welded Vang Toggle Fits *FM2-11* and NG2-12 Vang Brackets. SS tube is 2 5/8" (67mm) long and is drilled for 14mm Vertical Pin, NG2-14. Welded SS Tab is 5.5mm (7/32") thick and projects 2 1/2" (65mm) out from tube. Toggle for 1/2" Pin is used with NG1 Isovang.
*NG2 Vang Toggle w/ Slot & hole for 14mm Pin: NG2-18S:* SS Welded Vang Toggle Fits *FM2-11* and NG2-12 Vang Brackets and has 14mm (9/16") hole for attachment of Sparcraft Pneuvang. SS tube is 2 3/4" (70mm) long and is drilled for 14mm Vertical Pin, NG2-14. Welded SS Tab is 5mm (3/16") thick and projects 2 9/16" (65mm) out from tube center. Tab has 14mm hole for attachment of Vang, and slot (14mm x 28mm) for attachment of Vang Tackle.
*NG2 SS Vang Toggle w/ hole for 14mm Pin: NG2-18-4P:* SS Welded Vang Toggle Fits *FM2-11* and NG2-12 Vang Brackets and has 14mm (9/16") hole for attachment of Sparcraft Pneuvang. SS tube is 2 3/4" (70mm) long and is drilled for 14mm Vertical Pin, NG2-14. Welded SS Tab is 6mm (1/4") thick and projects 2 9/16" (65mm) out from tube center. Tab has (1) 14mm hole for attachment of Vang, and (3) 8mm (5/16") holes for blocks or shackles for attachment of Vang Tackle.
*NG2 SS Vang Toggle w/ hole for 22mm Pin: NG2-19:* SS Welded Vang Toggle Fits *FM2-11* and NG2-12 Vang Brackets. SS tube is 2 5/8" (67mm) long and is drilled for 14mm Vertical Pin, NG2-14. Welded SS Tab is 5.5mm (7/32") thick and projects 4" (100mm) out from tube. Tab has 22mm (7/8") hole for attachment of NG2 Isovang. Also recommended for use with Soft (block and tackle) Vangs, as the large hole will accommodate any shackle.

FM-580 Mast - Deck Collars, Mast Boots & Hardware
FM-580 Mast Boot: FM460-15BL: Heavy molded Black Rubber Boot for use with FM-460 & FM-580 Mast section and smaller FM-580 Deck Collars.
FM-580 Mast Boot: FM580-15BL: Heavy molded Black Rubber Boot for use with FM-580 & larger Mast sections and larger FM-580 Deck Collars. 580,740,1060,622,830
FM-580 Mast Boot Clamp: FM580-16M: All Stainless Steel Clamp for use with Mast Boot on FM-580 Mast. 52
FM-580 Collar Boot Clamp: FM580-16C: All Stainless Steel Clamp is suitable for use with Mast Boots on all FM-580 Deck Collars. 88
*Mast Collar Wedge – Small Rubber: NGA-18:* Heavy Extruded Rubber Wedge for use with Isomat and other Masts. Small stepped Rubber Wedge is used to support the mast as it passes through the Deck Collar. Wedge is 2 3/4" (70mm) long x 1 1/8" (28mm) wide, and is 15/16" (24mm) thick at the top tapering to 3/8" (10mm) thick at the bottom.
*Mast Collar Wedge – Large Rubber: NGA-19:* Heavy Extruded Rubber Wedge for use with Isomat and other Masts. Large stepped Rubber Wedge is used to support the mast as it passes through the Deck Collar. Wedge is 2 3/4" (70mm) long x 1 1/8" (28mm) wide, and is 1 3/16" (30mm) thick at the top tapering to 11/16" (18mm) thick at the bottom.

FM-580 Deck Collar - Standard: FM460-12: FM-580 Deck Collar - Standard, White: FM460-12PW: Cast Aluminum Deck Collar for use with FM-580, F-560E and other Mast Sections. Deck Collar has provisions for (10) new-style Mast Base Turning Blocks, (2) NG2-21 Block Studs (forward), and a SS Bail, NG2-20, for attachment of a soft Boom Vang. Nut slots on underside of casting and 12mm holes allow for attachment of Mast Base Turning Blocks, NGA-40 or NGA-41, without unfastening Deck Collar; Vang Bail and Block Studs (forward) must be installed at the same time the Deck Collar is. Includes Four (4) provisions for deck tie-down turnbuckles, and numerous slots for NGA-18 and NGA-19 Mast Wedges. Cast Deck Collar is 16" (405mm) long x 10 3/8" (260mm) wide, and fastens to deck with (6) 1/4" (6mm) FH Screws. Maximum inside dimension is 10 3/8" x 5 5/8". Some units are labeled 556002. Bcirc.33". 460,580,740,760E
	*Urethane Wedge for Deck Collar: FM580-12MW:* Black Urethane Mast Collar Wedge fits tightly between Mast and FM-580 Standard and Clamp Ring Deck Collars, *FM460-12* and FM460-11C, to provide even loading all around the mast and increased resistance to water penetration. One-piece molded construction is far superior to individual wedges, but requires that unit be slipped onto Mast before stepping. Unit is (maximum) 12 1/2" (315mm) long x 7 3/8" (187mm) wide x 3 1/8" (80mm) high.
	NG2 Mast Step Block Stud Pin - 12mm Small: NG2-21: 12mm SS Clevis Pin-shaped Block Stud is used for attachment of shackle or block to lead halyards aft. Fits in integral recessed 12mm hole in a variety of Mast Steps and Deck Collars. Block Stud is installed from underside of Casting, Casting must be removed to install Block Studs. Small head Block Stud is 12mm diameter x 45mm (1 3/4") long (maximum), with a 30mm (1 3/16") grip length and a 6mm (1/4") hole for shackle pin or Block bolt.
	NG2 Deck Collar Bail: NG2-20: SS Formed Bail is used for attachment of Boom Vang, and fits in integral slot in aft side of Deck Collars. Bail is installed from underside of Deck Collar Casting; Deck Collar must be removed to install Bail. Bail is made from 10mm (3/8") rod, and is 2 3/4" (70mm) long x (maximum) 1 15/16" (50mm) high.

FM-580 Clamp Ring Deck Collar Ass'y - Complete: FM580-11A:
Clamp Ring Deck Collar Assembly for use with FM-580 Mast Section includes attached SS Plates (both sides and aft) with multiple holes for attachment of Blocks and shackles. Deck Collar includes Four (4) provisions for deck tie-down turnbuckles, Assembly includes *FM580-11MW* One-piece Urethane Mast Collar Wedge, and the *FM580-11CR* Deck Collar Wedge Clamp Ring, below.
	*Deck Collar only for Clamp Ring: FM460-11C:* Cast Aluminum Deck Collar only, as used in FM-580 Clamp Ring Deck Collar Assembly, FM580-11A, above. Deck Collar features (4) provisions for deck tie-down turnbuckles, and numerous slots for NGA-18 and NGA-19 Mast Wedges, but is commonly used with the *FM580-11MW* One-piece Urethane Mast Collar Wedge, and the *FM580-11CR* Deck Collar Wedge Clamp Ring, below. Collar is 400mm (15 3/4") long x 255mm (10 1/16") wide and attaches to Deck with (4) 10mm FH and (2) 10mm RH screws. 460,580,622,740
	*Urethane Wedge for Deck Collar: FM580-12MW:* Black Urethane Mast Collar Wedge fits tightly between Mast and FM-580 Standard and Clamp Ring Deck Collars, *FM460-12* and FM460-11C, to provide even loading all around the mast and increased resistance to water penetration. One-piece molded construction is far superior to individual wedges, but requires that unit be slipped onto Mast before stepping. Unit is (maximum) 12 1/2" (315mm) long x 7 3/8" (187mm) wide x 3 1/8" (80mm) high.
	*Deck Collar Wedge Clamp Ring: FM580-11CR:* Cast Aluminum Deck Collar Wedge Clamp Ring for use with FM-580 Deck Collar, FM580-11C, and Urethane Mast Collar Wedge, FM580-11MW. Unit is (maximum) 13 1/2" (343mm) long x 7 11/16" (196mm) wide, and must be slipped onto Mast before stepping. 19161 1 1790

FM-580 Simple Deck Collar - Island Packet: FM580-13: Simple Aluminum Deck Collar for use with FM-580 and F-560E Mast Sections provides a clean, uncluttered look without any attachment provisions. Used with Special One-piece Mast Collar Wedge, FM580-13SW, below. Cast Deck Collar is 12 1/2" (318mm) long x 8 1/2" (216mm) wide x (maximum) 1 3/4" high, and fastens to deck with (6) 1/4" (6mm) screws. Maximum ID is 9 5/8" x 5 5/8". Unit is finished in Island Packet Ivory color. As used on Island Packet 350, and others. 560E, Bcir 28 3/4"
	FM-580 Island Packet Mast Collar Wedge: FM580-13SW:
	Special One-piece Molded Polyurethane Wedge for use with FM-580 Mast and Special Island Packet Deck Collar, FM580-13. One-piece molded Wedge fits like a glove to give maximum support to the mast as it passes through the Deck Collar. Wedge is (maximum) 10 3/4" (273mm) long x 6 5/8" (168mm) wide x 3" (76mm) high. As used on Island Packet 350, and others.

FM-580 Simple Deck Collar: FM580-10: Simple Aluminum Deck Collar for use with FM-580 Mast Section provides a clean, uncluttered look without any attachment provisions for Blocks or Bails. Cast Deck Collar includes Four (4) provisions for deck tie-down turnbuckles, and numerous slots for NGA-18 and NGA-19 Mast Wedges, but also is used with the *FM580-12MW* One-piece Urethane Mast Collar Wedge. FR,580,740

FM-580 Mast - Mast Steps
FM-580 Mast Step - Keel Mount: FM460-1K: Adjustable Keel-mounted Mast Step for FM-580, F-560E and other Mast Sections, attaches to the keel or keelson with (4) 10mm (3/8") bolts in external slots to allow for precise positioning without unstepping the mast. Cast clear anodized Mast Step is 10 3/16" (260mm) long x 7 1/4" (185mm) wide, and allows for 25mm (1") fore and aft adjustment. Unit is marked 557403. Step is sometimes mounted on Deck, as with Catalina 34, 36, 387, and others. 460,560E
	*Halyard Organizer Plate: FM385-2HP:* Halyard Organizer Plate is designed to fit under the FM580-1K Mast Step when used on deck. Formed SS Plate has seven (7) 3/4" (19mm) holes on each side as well as five (5) on the aft side for attaching halyard turning blocks, boom vang, and halyard shackles. Base is 10 1/2" (265mm) long x 7 1/2" (190mm) wide and has (4) 1/2" mounting holes on 7316" x 5 7/8" centers, as well as a central 3" (75mm) hole for wiring conduit. Plate measures 11 5/8" x 9 5/8" overall and can also be drilled for use with any mast step up to 7 1/2" wide.
FM-580 Mast Step - Keel Mount Special: FM385-2K: Heavy-duty Adjustable Keel-mounted Mast Step for FM-580 and other Mast Sections attaches to the keel or keelson with (4) 10mm (3/8") bolts in external slots to allow for precise positioning without unstepping the mast. Cast clear anodized Mast Step is 10 3/16" (260mm) long x 7 1/4" (185mm) wide, and allows for 25mm (1") fore and aft adjustment. Unit is marked 36032503853. Step is sometimes mounted on Deck, as with Catalina 350, and others. 305,385,460,560E
FM-580 Mast Step - Deck Mount: FM580-4: Cast Aluminum Mast Step for use with FM-580, F-560E and other Mast Sections. Mast Step has provisions for (8) 12mm Mast Step Block Pins, NG2-21, and a SS Bail, *NG2-20*, for attachment of a soft Boom Vang. Block Pins and Bail are installed from underside of Mast Step Casting, Mast Step must be removed to install Block Pins or Bail. Cast Mast Step is 13" (332mm) long x (maximum) 9" (229mm) wide, and fastens to deck with (6) 1/4" (6mm) FH Screws. 185567,460,580,560E
FM-580 Mast Step - Deck Mount: FM460-4M: Cast Aluminum Mast Step for use with FM-460, FM-580, F-560E, and S-622 Mast Sections. Mast Step has provisions for (8) 14mm Mast Step Block Pins, NG3-21, and a SS Bail, NG2-20, for attachment of a soft Boom Vang. Block Pins and Bail are installed from underside of Mast Step Casting, Mast Step must be removed to install Block Pins or Bail. Cast Mast Step is 13" (332mm) long x (maximum) 9" (229mm) wide, and fastens to deck with (6) 5/16" (8mm) FH Screws. As used on Sun Odyssey 409, and others. 185567m622d,580,560E
	NG3 Mast Step Block Pin - 14mm: NG3-21: 14mm SS Block Pin is used for attachment of shackle or block to lead halyards aft. Fits in integral recessed hole in Mast Steps and Deck Collars with 14mm mounting holes. Block Pin is installed from underside of Mast Step Casting, Mast Step must be removed to install Block Pins. Special Block Pin is 14mm (9/16") diameter x 54mm (2 1/8") long (maximum), with a 35mm (1 3/8") grip length and an 8mm (5/16") hole for shackle pin, Block bolt or Block Pin Swivel Assembly.
FM-580 Mast Step - Deck Mount - Large: FM580-4L: Cast Aluminum Mast Step for use with FM-580 Mast Section. Mast Step has provisions for (10) 14mm Mast Step Block Pins, NG3-21, (2) NG2-21 12mm Block Studs (forward), and a SS Bail, *NG2-20*, for attachment of a soft Boom Vang. Block Pins and Bail are installed from underside of Mast Step Casting, Mast Step must be removed to install Block Pins or Bail. Cast Mast Step is 13 3/4" (350mm) long x (maximum) 8 7/8" (225mm) wide, and fastens to deck with (6) 1/4" (6mm) FH Screws. FR185030, 580,740,760E		MMM
FM-580 Mast Step - Deck Mount: FM580-5: Cast Aluminum Mast Step for use with FM-580 Mast Section.		IP
FM-580 Mast Step – Special: NG70-6: Cast Aluminum Mast Step for use with FM-580, F-560E and NG-70 Mast Sections. Mast Step has provisions for a SS Bail, NG2-20, for attachment of a soft Boom Vang, and multiple removable Blocks attached to optional SS Rods (under the casting). Cast Mast Step is 13 3/8" (340mm) long x 10 3/8" (265mm) wide, and fastens to deck or keel with (4) 5/16" (8mm) FH Screws on 8 1/2" (215mm) (fore & aft) x 6 1/4" (160mm) (athwartships) centers. Unit is marked 556182. As used on Beneteau Oceanis 400, and others. F580,F560E RRP
FM-580 Mast Step - Deck Mount: FM580-6: Cast Aluminum Mast Step for use with FM-580, F-560E and other Mast Sections. Mast Step has provisions for 10 new-style Mast Base Turning Blocks and a SS Bail, *NG2-20, for attachment of a soft Boom Vang. Nut slots on underside of casting and 12mm holes allow for attachment of Mast Base Turning Blocks, NGA-40* or NGA-41, without unfastening Mast Step. Cast Mast Step is 11 3/8" (290mm) long x (maximum) 8 1/4" (208mm) wide, and fastens to deck with (6) 5/16" (8mm) FH Screws. Unit is marked 36031213053. 305,385,460,580,560E RRP
	NG2 Mast Step Block Stud Pin - 12mm Small: NG2-21: 12mm SS Clevis Pin-shaped Block Stud is used for attachment of shackle or block to lead halyards aft. Fits in integral recessed 12mm hole in a variety of Mast Steps and Deck Collars. Block Stud is installed from underside of Casting, Casting must be removed to install Block Studs. Small head Block Stud is 12mm diameter x 45mm (1 3/4") long (maximum), with a 30mm (1 3/16") grip length and a 6mm (1/4") hole for shackle pin or Block bolt.
	NG2 Mast Step Bail: NG2-20: SS Formed Bail is used for attachment of Boom Vang, and fits in integral slot in aft side of Mast Steps. Bail is installed from underside of Mast Step Casting; Mast Step must be removed to install Bail. Bail is made from 10mm (3/8") rod, and is 2 3/4" (70mm) long x (maximum) 1 15/16" (50mm) high.

FM-580 Internal Waterproofing Plug: FM580-WP: Internal Waterproofing Plug is installed in Keel-stepped Masts to prevent water intrusion below deck. Assembly consists of 2 plastic pieces carefully cut to fit Mast interior with central PVC standpipe to allow passage of electrical wires. Unit slides up from the bottom of the Mast to a point just above Deck level where a hole is drilled in Mast to allow for application of expanding foam between plastic pieces. Second hole is drilled just above upper plastic piece to allow water drainage.
	Internal Waterproofing Foam: NGA-Foam: Expanding foam is used for installation of Internal Waterproofing Plug. Single-use can is sufficient for installation of any Internal Waterproofing Plug.

See also Sparcraft Booms, and Sparcraft Spreaders. See also, Sparcraft FM Masts, and other Sparcraft Mast Sections.

FM-580 Mast Components
Mastheads Tangs Jib Boxes & Forestay Attachments Exit Blocks Spreaders Spreader Bases Spinnaker Cars Exit Plates Cleats	Mainsail Gates & Feeders Gooseneck Brackets Winch Pads Vang Brackets & Hardware Deck Collars, Mast Boots & Hardware Mast Steps Internal Waterproofing

Sparcraft FM-580 Mast Section Sparcraft FM-580 Mast Section is available in a variety of lengths fully anodized. Painted finishes and other lengths are available on special order. If you require a complete Mast Assembly, you can select from components below and contact us with specifications. If you require components not listed below please contact us with complete details.

FM-580 Mast – Mastheads FM-580 Masts commonly use a variety of (at least 7) different Extruded Mastheads, both welded and bolt-in, for Masthead and for Fractional Rigs. Mastheads and components produced in France are completely different from those produced in the US. In addition, Fractional and Masthead Rigs, on Tapered and Untapered Masts, all use different Masthead Assemblies. Parts common to the French Mastheads are listed below, as are Parts common to the US-manufactured Mastheads. For complete Masthead Assemblies and Parts not listed, Please contact us with full details.


FM-580 Mast – Masthead Parts FM-580 Masts are produced with a variety of different Mastheads, including the standard NG2 cast Masthead. Others have been produced using a variety of Extruded Mastheads, both welded and bolt-in, for Masthead and for Fractional Rigs. Common parts are listed below, by Masthead type.

NG2 Masthead Parts NG2 Mastheads are cast from high-strength Aluminum alloy, and are welded into the mast section. Isomat NG2 Mastheads are easily identified by having 4 sheaves (or provision for 4 sheaves) side by side, on the forward side. NG2 Masthead Parts are listed below. For Details, See: NG2 Masthead Assembly.
NG2 Masthead Cover Plate: NG2-1: Cast aluminum Masthead Cover Plate for NG2 standard Masthead. Masthead Cover Plate also provides level surface for mounting Anchor light and has holes and slots for exiting other electrical wires. Unit is 10 1/4" (260mm) long (maximum) x 7 1/8" (180mm) wide, and is fastened with two (2) 6mm screws, NG2-1S, that thread into tapped holes in Masthead.
NG2 Masthead Spinnaker Crane: NG2-2: Heavy SS Masthead Spinnaker Crane is designed to attach to standard Isomat NG2 Masthead. Crane allows for off-center attachment of one or two standard swivel blocks for external spinnaker halyards, See Spinnaker Halyard Blocks. This method of running spinnaker halyards has less friction and eliminates the chafe on halyards that is inherent in the standard internal halyard design – it is the only choice for long-distance racing or cruising. Halyards can be led internally; running from the swivel block to an entrance 5-8 feet down from the masthead, but this method does add a potential chafe spot. Attaches with (4) 5/16" (8mm) bolts and locknuts. SS Plate is (maximum) 4" long x 5 3/8" wide x 1/4" thick, and projects 1 3/8" forward of the masthead. Easily positioned on the masthead, mounting requires drilling (4) 5/16" holes in the masthead. Unit comes complete with fasteners.

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Spars, Rigging, and Hardware for Sailboats