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Spars, Rigging, and Hardware for Sailboats

Rig-Rite, Inc.
 Phone: (001) 401-739-1140 -- FAX: (001) 401-739-1149
www.RigRite.com          Ordering/Questions

Isomat/Sparcraft Sheaves & Rollers

Isomat and Sparcraft use a variety of Acetyl (hard plastic) Metric Sheaves in their Mast and Boom applications. These Sheaves are sufficiently strong to be used with wire halyards, as they are in Europe. Turned Delrin Sheaves are sometimes used in higher load applications. Anodized Aluminum Sheaves are manufactured in the U.S., for high load applications and for their greater longevity. The most common Sheaves are listed below, but, as always, there are many "Specials". All Isomat/Sparcraft Sheaves run directly on a SS axle. Press-fit Delrin Sheave Bushings are available for some Sheaves to allow use with smaller diameter axles.
Rollers do not have any groove, and are sometimes used as sheaves in a limited number of low-load applications.
Sheaves and Rollers are listed below by size, and by common application, they are also listed elsewhere under the specific item they are used with, See: Isomat Spars, and Sparcraft Spars.

For other Metric Sheaves, See Francespar Sheaves, and Z-Spar Sheaves.
See also: Sheaves Main Page.
Isomat Sheaves & Rollers by Size
*Sheave Width is rounded up to the next 0.5mm.
Part # OD Width* ID Material
: NB1-11R:
18mm (11/16") 15mm (9/16") 10mm (3/8") Delrin (Roller)
: NG1-5R:
18mm (11/16") 15mm (9/16") 10mm (3/8") Delrin (Roller)
: NB1-20R:
22mm (7/8") 15mm (9/16") 10mm Delrin (Roller)
: NB2-20R: 35mm (1 3/8") 15mm (9/16") 10mm Delrin (Roller)
: NB2-21R: 50mm (2") 16mm (5/8") 12mm Delrin (Roller)
: NB1-10:
30mm (1 3/16") 10mm (3/8") 10mm (3/8") Acetyl
: NB1-10A:
30mm (1 3/16") 10mm (3/8") 10mm Aluminum
: NG1-3:
50mm (2") 14.5mm (9/16") 10mm Acetyl
: NG1-3D:
50mm (2") 14.5mm (9/16") 10mm Delrin
: NG1-3A:
50mm (2") 14.5mm (9/16") 10mm Aluminum
: NB2-10XA:
50mm (2") 14.5mm (9/16") 10mm Alu. Deep Groove
: NG1-4:
60mm (2 5/16") 14.5mm (9/16") 10mm Acetyl
: NG1-4D:
60mm (2 5/16") 14.5mm (9/16") 10mm Delrin
: NG1-4A:
60mm (2 5/16") 14.5mm (9/16") 10mm Aluminum
: NG1-4NS:
60mm (2 5/16") 6mm (1/4") 10mm Stainless Steel
: NG2-3B10:
85mm (3 3/8") 15mm (9/16") 10mm Acetyl w/ Bushing
: NG2-3AB10:
85mm (3 3/8") 15mm (9/16") 10mm Alu. w/ Bushing
: NG2-3B12:
85mm (3 3/8") 15mm (9/16") 12mm (7/16") Acetyl w/ Bushing
: NG2-3AB12:
85mm (3 3/8") 15mm (9/16") 12mm Alu. w/ Bushing
: NG2-3:
85mm (3 3/8") 15mm (9/16") 22mm (7/8") Acetyl
: NG2-3D:
85mm (3 3/8") 15mm (9/16") 22mm Delrin
: NG2-3A:
85mm (3 3/8") 15mm (9/16") 22mm Aluminum
: NG2-4B10:
85mm (3 3/8") 20mm (3/4") 10mm Acetyl w/ Bushing
: NG2-4B12:
85mm (3 3/8") 20mm (3/4") 12mm Acetyl w/ Bushing
: NG2-4-16:
85mm (3 3/8") 20mm (3/4") 16mm (5/8") Acetyl
: NG2-4-16A:
85mm (3 3/8") 20mm (3/4") 16mm (5/8") Aluminum
: NG2-4,  NGV2-3 85mm (3 3/8") 20mm (3/4") 22mm Acetyl
: NG2-4D:
85mm (3 3/8") 20mm (3/4") 22mm Delrin
: NG2-4A:
85mm (3 3/8") 20mm (3/4") 22mm Aluminum
: NG3-3SW: 85mm (3 3/8") 34mm (1 5/16") 12mm Wide Delrin
: NG3-3:
110mm (4 5/16") 21mm (13/16") 18mm (<3/4") Delrin
: NG3-3ABB:
110mm (4 5/16") 21mm (13/16") 18mm Alu. Ball-Bearing
Sparcraft Sheaves & Rollers by Size
Sparcraft Spars use all the Sheaves & Rollers listed under Isomat Sheaves, above.
In addition, a wide variety of others are used, common ones are listed here.
*Sheave Width is rounded up to the next 0.5mm.
Part # OD Width* ID Material
: NG2B-12L:
22mm (7/8") 21mm (13/16") 12mm (7/16") Delrin (Roller)
: FM0-2S:
25mm (1") 10mm (3/8") 8mm (5/16") Acetyl Black
: SM25R13-10:
25mm (1") 13mm (1/2") 10mm (3/8") Delrin
: FB36-10G:
27mm (1 1/16") 10mm (3/8") 8mm Acetyl Black
: FM1-2S:
30mm (1 1/8") 10mm (3/8") 8mm Acetyl Black
: SM32A18-10:
32mm (1 1/4") 18mm (<3/4") 10mm Aluminum
: SM35R15-10:
35mm (1 3/8") 15mm (9/16") 10mm Delrin
: FB125-10:
37mm (1 1/2") 10mm (3/8") 8mm Delrin
: FM0-3:
40mm (1 9/16") 10mm (3/8") 8mm Acetyl Black
: SM40R17-10:
40mm (1 9/16") 17mm (>5/8") 10mm Delrin
: SM43A14-10: 43mm (<1 3/4") 14mm (9/16") 10mm Aluminum
: SM48R13-10:
48mm (1 7/8") 12.5mm (1/2") 10mm Delrin Black
: SM50A10-10:
50mm (2") 10mm (3/8") 10mm Aluminum
: SM56A15-14:
56mm (2 1/4") 15mm (9/16") 14mm (9/16") Aluminum
: SM60R12-10:
60mm (2 5/16") 12mm (7/16") 10mm Delrin
: SM60R15-12:
60mm (2 5/16") 15mm (9/16") 12mm Delrin
: SM60R16-10:
60mm (2 5/16") 15.5mm (<5/8") 10mm Delrin Black
: SM60R17-12:
60mm (2 5/16") 16.5mm (>5/8") 12mm Delrin
: FB3-10S:
60mm (2 5/16") 20mm (>3/4") 12mm Delrin
: SM60R27-12:
60mm (2 5/16") 27mm (1 1/16") 12mm Delrin
: SM65R22-18:
65mm (2 9/16") 21.5mm (<7/8") 18mm (<3/4") Delrin
: SM70R14-35:
70mm (2 3/4") 14mm (9/16") 35mm (1 3/8") Delrin
: SM75R16-12B:
75mm (3") 16mm (5/8") 12mm Delrin w/ Bushing
: SM80R15-12:
80mm (3 1/8") 15mm (9/16") 12mm Delrin
: SM80R19-16:
80mm (3 1/8") 19.5mm (3/4") 16mm (5/8") Delrin
: FB3-10D: 80mm (3 1/8") 20.5mm (13/16") 12mm Delrin
: SM80R21-22:
80mm (3 1/8") 20.5mm (13/16") 22mm (7/8") Delrin
: NG2-4B12:
85mm (3 3/8") 21mm (13/16") 12mm Acetyl w/ Bushing
: SM85R16-12:
85mm (3 3/8") 15.5mm (<5/8") 12mm Delrin Black
: SM85R20-12: 85mm (3 3/8") 20mm (>3/4") 12mm Delrin Black
: SM85R34-12: 85mm (3 3/8") 34mm (1 5/16") 12mm Acetyl
: SM90R16-14:
90mm (3 1/2") 16mm (5/8") 14mm Delrin
: SM90R22-18:
90mm (3 1/2") 21.5mm (<7/8") 18mm (<3/4") Delrin
: SM100R16-35:
100mm (4") 15.6mm (9/16") 35mm (1 3/8") Delrin
: SM120R21-18:
120mm (4 3/4") 21mm (13/16") 18mm Delrin
: SM140R22-20:
140mm (5 1/2") 22mm (7/8") 20mm (13/16") Delrin
Isomat / Sparcraft Sheaves & Rollers by Application
Sparcraft Spars use all the Sheaves & Rollers listed under Isomat Sheaves, above.
In addition, a wide variety of others are used, common ones are listed here.
*Sheave Width is rounded up to the next 0.5mm.
Sheaves & Rollers by Application

Mast Sheaves & Rollers
   NG 1 Masthead Part #
11/16" OD (18mm) Forward Roller for Spinnaker Halyard NG1-5R
2" OD (50mm)   Acetyl Sheave, 10mm ID NG1-3
2" OD (50mm) Aluminum Sheave NG1-3A
2 5/16" OD (60mm)   Acetyl Sheave, 10mm ID NG1-4
2 5/16" OD (60mm)   Aluminum Sheave NG1-4A
   NG 2 Masthead
3 3/8" OD (85mm) Acetyl Sheave, 21.5mm (7/8") ID  (6 pieces maximum) NG2-3
3 3/8" OD (85mm) Aluminum Sheave NG2-3A
   NG 3 Mastheads
3 3/8" OD (85mm) Delrin 12mm (<1/2") ID, 34mm (1 5/16") wide NG3-3SW
4 5/16" OD (110mm) Delrin 18mm (<3/4") ID  (6 pieces maximum) NG3-3
4 5/16" OD (110mm) Aluminum 18mm (<3/4") ID w/ Torlon Ball-Bearings NG3-3ABB
4 5/16" OD (110mm) Aluminum 18mm (<3/4") ID w/ Torlon Ball-Bearings NG3-3ABB
   FM 0, FM1 Masts
1" OD (25mm) Delrin 8mm (5/16") ID  (FM0 Hinged Mast Step) FM0-2S
1 9/16" OD (40mm) Delrin 8mm (5/16") ID  (Mastheads & FM0 Jib Box) FM0-3
1 1/8" OD (30mm) Delrin 8mm (5/16") ID  (FM1 Hinged Mast Step) FM1-2S
   FM 2 & Larger Mastheads
FM 2 & Larger Mastheads use all the sheaves listed under NG Mastheads, above. In addition, many use a wide variety of Specials, common ones are listed here.  
3 3/8" OD (85mm) Acetyl Sheave 12mm ID NG2-3B12
1 7/8" OD (48mm) Delrin, 10mm ID  (FM-135 Masthead) SM48R13-10
2 5/16" OD (60mm)   Delrin, 12mm (<1/2") ID  (FM-195, 230 Masthead) SM60R15-12
3 3/16" OD (80mm)   Delrin, 12mm (<1/2") ID  (FM-305 Masthead) SM80R15-12
4 5/16" OD (110mm)   Delrin, 21mm (13/16") wide, 18mm (<3/4") ID NG3-3
5 1/2" OD (140mm)   Delrin, 21mm (13/16") wide, 20mm (>3/4") ID NG4-3
   NG 1 Cast Fractional Jib Box
2 5/16" OD (60mm) Acetyl Sheave, 10mm ID (1 or 2 required) NG1-4
2 5/16" OD (60mm) Aluminum Sheave NG1-4A
2 5/16" OD (60mm) SS Narrow Lower Sheave - 1/4" wide (2 required) NG1-4NS
   NG 2 Cast Fractional Jib Box
3 3/8" OD (85mm) Acetyl 5/8" ID /  3/4" wide NG2-4-16
    NG 1 Welded Mast Base Sheave Box
2 5/16" OD (60mm) Acetyl Sheave NG1-4
2 5/16" OD (60mm) Aluminum Sheave NG1-4A
   NG 2 Welded Mast Base Sheave Box
3 3/8" OD (85mm) Acetyl Sheave 10mm ID NG2-3B10
3 3/8" OD (85mm) Aluminum Sheave 10mm ID NG2-3AB10
Boom Sheaves & Rollers
   NB 16, NB 26 Booms Part #
11/16" OD (18mm) Gooseneck & Outboard Roller (3 forward, 2 aft) : NB1-11R:
1 3/16" OD (30mm) Acetyl Outhaul Sheave (1 required aft) : NB1-10:
1 3/16" OD (30mm) Aluminum Outhaul Sheave : NB1-10A:
7/8" OD (22mm) Delrin (Shuttle Block Roller) NB1-20R
   NB 32, NB 40, NB 55 Booms
2 5/16" OD (60mm) Acetyl Sheave, 10mm ID (all sheaves, 4 per end) : NG1-4:
  
2 5/16" OD (60mm) Aluminum Sheave : NG1-4A:
7/8" OD (22mm) Delrin (AutoReef Roller) 10mm ID : NB1-20R:
1 3/8" OD (35mm) Delrin (AutoReef / Shuttle Block Roller) 10mm ID : NB2-20R:
   FB 36, FB 60, FB 125 Booms
1 1/16" OD (27mm) Acetyl Sheave, 8mm ID (FB-36 Gooseneck) :FB36-10G:
1 1/8" OD (30mm) Acetyl Sheave, 8mm ID (FB-36 Outhaul, 60, 125 GN) : FM1-2S:
1 1/2" OD (37mm) Acetyl Sheave, 8mm ID (FB-125 Outhaul) : FB125-10:
1 9/16" OD (40mm) Acetyl Sheave, 8mm ID (FB-60 Outhaul) : FM0-3:
   FB 220, FB 550 Booms
2" OD (50mm) Acetyl Sheave, 10mm ID (all sheaves, 4 per end) : NG1-3:
  
7/8" OD (22mm) Delrin (Gooseneck AutoReef Roller) 10mm ID : NB1-20R:
   FB 810, FB 1700, FB 3400 Booms
3 3/8" OD (85mm) Acetyl Sheave, 12mm ID (all sheaves, 4 in each end) : NG2-4B12:
  
3 1/8" OD (80mm) Delrin Sheave, 12mm ID (all sheaves, 4 in each end) FB3-10D   
2 3/8" OD (60mm) Delrin (Gooseneck AutoReef Sheave) 12mm ID : FB3-10S:
   FBR 249 Grand Prix Booms (J/109, J/122)
2 3/4" OD (70mm) Delrin Sheave, 35mm ID (Gooseneck, 4 each) : SM70R14-35:
4" OD (100mm) Delrin Sheave, 35mm ID (Outhaul, 4 each) : SM100R15-35:

Isovang Sheaves
   NG 1 Isovang       2" OD (50mm)          Acetyl  (2 per end) : NG1-3:
   NG 2 Isovang       3 3/8" OD (85mm)    Acetyl - 3/4" wide  (2 per end) NGV2-3
   

Sheave Bushings for NG2 Sheaves
Precision press-fit Delrin Bushings produced by RigRite to reduce the ID of NG2-3 & NG2-4 Sheaves.
 
Part # OD Width ID Isomat Approximation
: NG2B-10:
22mm (7/8") 15mm (9/16") 10mm    NB1-20R
: NG2B-12:
22mm (7/8") 15mm (9/16") 12mm    151189
: NG2B-10L:
22mm (7/8") 20mm (3/4") 10mm    None
: NG2B-12L:
22mm (7/8") 20mm (3/4") 12mm    None

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