Isomat NB26 Boom

Isomat NB-26 Boom Section Measurements (OD): 4" x 3 1/2" (100mm x 90mm) Wall Thickness: .098" (2.5mm) m092 Weight/ft.: 1.76 lbs. Weight/M: 2.63 kg Moments of inertia: Ixx = 2.48", Iyy = 2.07" Moments of inertia: Ixx = 132cm4, Iyy = 82cm4 Circumference: 12 3/4" (324mm) Sail slides: 1/2" round slugs (A018, A118) or 1/2" boltrope Lower Track: 31mm x 3mm (1 7/32" x 1/8") Alloy: 6061-T6 Standard Boom Lengths: * Common Boom usage: Albin Vega 27*, Ballad 30, Delta 31,
Nova 32; Aloha 30C, 30R, 32, 34; Aphrodite 29, 101; Bandholm 27; Bayfield 32C, 32D; Bavaria 808, 820, 30; Beneteau* First 30E, 32, 325; Beryll 30; Bianca Lido 30; Biga 24; Bison 31; Bumerang 8.6, 32; Capital 27, 28, 30, 33; Carter 30, 33; Catalina* 270; Compac* 27; CS 27; Ericson 26; Express 30; Freedom 20; Formosa 34, 51K (mizzen); Gulf 27, 29; Hunter 28.5, 31; Island Packet 27; Mamba* 311, 33; Maota 42K (mizzen); Mirage 27, 275, 29, 30, 32, 35; O'Day 272, 28, 280, 290, 30; Omega 30; Pearson 27, 28, 303; San Juan 28; Scanmar 31, 33; Tanzer 29; Tartan 28; Transworld 41K (mizzen); Vancouver 25; Vagabond 47K (mizzen); Watkins 29; Whitby 42K (mizzen); and Mizzen and Staysail Booms on many larger Yachts.

Isomat NB-26 Boom Section Isomat NB-26 Boom Section is stocked in a variety of lengths fully anodized. Sections can be ordered bare (unmachined), or cut to shorter lengths with or without milling for other components. Painted finishes and other lengths are available on special order. If you require a complete Boom Assembly, you can select from components below and contact us with specifications. If you require components not listed below please contact us with details. All NB-26 Boom Ends have provisions for 3 internal lines.

NB-26 Boom Components Although no other components have changed, the NB-26 Boom has been produced with two (2) Different Gooseneck Arrangements. Both Goosenecks are pictured below, go to their respective pages for parts associated with them. Note that some Booms have been produced with the Isomat AutoReef (single line) Reefing System, using specially modified Boom End castings. For details, See: Isomat AutoReef System.

NB-26 New-Style Goosenecks look like this: New-Style NB-26 Gooseneck Assemblies and Parts.
NB-26 Old-Style Goosenecks look like this: Old-Style NB-26 Gooseneck Assemblies and Parts.

*Spar Cleat – 4 3/4": NGC-5:* Cast Aluminum Cleat is 120mm (4 3/4") long. Other Cleats have also been used on this boom section, and are listed separately. Other Isomat Cleats.
Exit Plate – Small Snap-in: NG1-7: Small Black plastic Snap-in Exit Plate eliminates line chafe, and accommodates a maximum of 7/16" line. Exit Plate measures 3 1/2" x 1" (87mm x 25mm), and installs in cut-out 13/16" x 2 7/8" (20mm x 74mm). Other Exit Plates have also been used on this boom section, and are listed separately. Other Isomat Exit Plates.
AutoReef Internal Shuttle Block: NB1-20: Cast aluminum Shuttle Block incorporates (2) 22mm (7/8") Delrin Roller sheaves, NB1-20R. Used with Isomat AutoReef (single line) Reefing System.

*NB1 Boom Bail Ass'y: NB1-15A:* SS Articulating Boom Bail is used for attachment of blocks and reef lines. Fits in integral slot in underside of NB-16, NB-26, and similar boom sections. Bail is made from 8mm (5/16") rod, formed plate is 30mm (1 3/16") wide x 90mm (3 1/2") long x 2mm thick. Fastens with (2) 3/16" (5mm) rivets.
	NB1 Boom Bail: NB1-15R: SS formed rod bail only, as used in NB1 Boom Bail Assembly NB1-15A, above. Bail is made from 8mm (5/16") rod, and is 2 1/16" (53mm) long x (maximum) 1" (25mm) high.
	NB1 Boom Bail Plate: NB1-15BP: SS formed plate only, as used in NB1 Boom Bail Assembly NB1-15A, above. Plate is 30mm (1 3/16") wide x 90mm (3 1/2") long x 2mm thick. Fastens with (2) 3/16" (5mm) rivets.

*NB1 Boom Vang Lug - 10mm (3/8") Pin: NB1-16-10:* SS Boom Vang Attachment Lug fits in integral slot in underside of NB1 and FB1 Boom sections and has 10mm (3/8") hole for attachment of NG1 Isovang and others. Slide plate (2.5mm) is 5 3/4" long x 27.5mm wide, and is welded to 5mm (3/16") thick Triangle. Unit slides into track and is fastened with (4) 3/16" (5mm) rivets.
*NB1 Boom Vang Lug - 14mm (9/16") Pin: NB1-16-14:* SS Boom Vang Attachment Lug fits in integral slot in underside of NB1 and FB1 Boom sections and has 14mm (9/16") hole for attachment of Sparcraft Pneuvang. Slide plate (2.5mm) is 5 3/4" long, and is welded to 5mm (3/16") thick Triangle. Slides into track and fastens with (4) 3/16" (5mm) rivets.
*NB1 Boom Vang Lug - 16mm (5/8") Pin: NB1-16-16:* SS Boom Vang Attachment Lug fits in integral slot in underside of NB1 and FB1 Boom sections and has 16mm (5/8") hole for attachment of Solid (hard) Vang Strut. Slide plate (2.5mm) is 5 3/4" long, and is welded to 5mm (3/16") thick Triangle. Slides into track and fastens with (4) 3/16" (5mm) rivets.
*NB1 Boom Vang Lug for Easykick 1 Vang: NB1-16E1:* SS Boom Vang Attachment Lug designed specifically for use with Easykick 1 Solid Vang. Fits in integral slot in underside of NB-16 and NB-26, and other boom sections with an underside boom bail slot that is 31mm wide x 3mm deep. Slide plate (2.2mm) is 3 1/2" (90mm) long, and welded to 4mm Triangular nose with hole for 6mm (1/4") pin. Slides into track and fastens in place with (2) 3/16" (5mm) rivets.
*NB1 Boom Vang Lug for Easykick 2 Vang: NB1-16E2:* SS Boom Vang Attachment Lug designed specifically for use with Easykick 2 Solid Vang. Fits in integral slot in underside of NB-16 and NB-26, and other boom sections with an underside boom bail slot that is 31mm wide x 3mm deep. Slide plate (3mm) is 3 15/16" (100mm) long, and welded to formed Triangular channel that is 13mm (1/2") wide (outside) with 8mm (5/16") clearance inside and hole for 6mm (1/4") pin. Slides into track and fastens in place with (2) 1/4" (6mm) rivets.
*NB1 Heavy-Duty Attachment for Easykick 2 Vang: NB1-16E2H:* SS Boom Vang Attachment Lug designed specifically for use with Easykick 2 Solid Vang. Fits in integral slot in underside of NB-16 and NB-26, and other boom sections with an underside boom bail slot that is 31mm wide x 3mm deep. Slide plate (2.2mm) is 5 1/8" (130mm) long, and welded to formed Triangular channel that is 16mm (5/8") wide (outside) with 10mm (3/8") clearance inside and hole for 6mm (1/4") pin. Slides into track and fastens in place with (2) 1/4" (6mm) rivets.

Isomat Isovang Isomat's Isovang is a tubular Hard (solid) Vang with integral sheaves and line that is Spring cushioned for Boom support. Commonly supplied with new boats, it is also a favorite addition to older boats with Isomat Spars. See: Isomat Isovangs. For Isomat Mast-mounted Brackets and Toggles to fit any Vang, See: Isomat Vang Brackets & Toggles.

NB-26 Outhaul Ass'y Complete: NB26-2A: Cast aluminum Outhaul Assembly incorporates provisions for internal outhaul and 2 internal reef lines. Outhaul line runs over centerline sheave NB1-10, reef lines over port and starboard rollers, NB1-11R. Sheave, rollers and axle slide in from the aft side simultaneously, and are held in place by the outhaul and/or reef lines. Rib on aft upper side allows for topping lift attachment. Aluminum centerline Sheave, NB1-10A, below, is recommended for Booms with a wire outhaul pennant, cruising and other heavy-duty applications.
	NB-26 Outhaul Casting: NB26-2: Replacement Aluminum Casting only, for the NB-26 Outhaul Assembly.
	NB1 Outhaul Roller: NB1-11R: Delrin Roller sheave is 18mm (11/16") OD x 14mm (9/16") wide x 10mm (3/8") ID. Two (2) are required for outboard reef lines.
	NB1 Outhaul Sheave: NB1-10: Acetyl Sheave is 30mm (1 3/16") OD x 10mm (3/8") wide x 10mm (3/8") ID. Sheave goes in center slot, for outhaul line. Aluminum Sheave, NB1-10A, below, is recommended for Booms with a wire outhaul pennant, cruising and other heavy-duty applications.
	NB1 Aluminum Outhaul Sheave: NB1-10A: Aluminum Sheave is heavy-duty version of the plastic NB1-10, above. Recommended for Booms with a wire outhaul pennant, cruising and other heavy-duty applications. Anodized Aluminum Sheave is 30mm (1 3/16") OD x 10mm (3/8") wide x 10mm (3/8") ID.
	Sheave/Roller Axle for NB-26 Outhaul: NB1-13: SS 'Drop-in' Sheave Axle pin is 10mm (3/8") dia. x 51mm (2") long.

NB1 SS Outhaul Slide: NB1-18: SS Outhaul Slide with welded Bail provides easy adjustment under load. Slide is 12mm (1/2") OD x 62mm (2 7/16") long, Bail ID is 34mm x 14mm (1 5/16" x 9/16"). As used on NB-16 and NB-26 Booms.
Outhaul Slide w/ Key Pin for Boltrope Groove: Sch 95-22X: SS Outhaul Slide features channel with 1/4" captive Key Pin for clew attachment, and a welded SS Eye for attachment of Outhaul line or Block. Slide body is formed SS with welded Eye and 1/2" ID channel for Clew. Slide fits all Boom Sections with a boltrope groove that is 7/16" ID or larger. Slide is 2 1/2" long x (maximum) 3/4" wide and 2" high. As used on NB-16 and NB-26 Booms.

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