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100mm Aluminum Double Block — Swivel

100mm Aluminum Double Block — Swivel

Part No. 3248

Sheave Ø (mm) 100 mm

Sheave Ø (in) 3 15/16 in

Maximum line Ø (mm) 16 mm

Maximum line Ø (in) 5/8 in

Maximum working load (kg) 4990 kg

Maximum working load (lb) 11000 lb

Black Magic Air blocks are a top favorite of Big Boat performance racers and cruisers. These lightweight, free-running, powerful performers are used for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems. A center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Shackle blocks lock in two directions or swivel to keep line from twisting. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Sheave Ø (mm)100 mm
Sheave Ø (in)3 15/16 in
Length (mm)227 mm
Length (in)8 15/16 in
Weight (g)1284 g
Weight (oz)45.28 oz
Shackle pin Ø (mm)12 mm
Shackle pin Ø (in)1/2 in
Maximum line Ø (mm)16 mm
Maximum line Ø (in)5/8 in
Maximum working load (kg)4990 kg
Maximum working load (lb)11000 lb
Breaking load (kg)9979 kg
Breaking load (lb)22000 lb
Composer Export826114591210137BOM IDDescriptionQty12127 SHKL. 12MM D HR12AL-3757 ALPHA CHEEK13AL-3758 BETA CHEEK14AL-3759 CENTER CHEEK15H-34391A SHEAVE ASSM.26HBB87 ROLLER CAGE ASSM.27HFS1271 FST. 6 X 1 X 16MM SHCS68HFS821 FST. 6 X 1 X 20MM SHSS19MP-3037 HD. POST COLLAR110MP-3039 HD. POST COLLAR MOD.111MS-197 SHEAR TUBE212SP-073 HEAD POST1tooltip
ID BOM Qty Price
2127 1 more info $173.20
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12mm "D" Shackle — High Resistance

Forged stainless steel shackles are polished to a high luster and are stamped with the screw pin diameter. High-Resistance (HR) shackles are forged in 17-4PH stainless steel to handle high loads. They have an "HR" imprint for easy identification.

SP-073 1 more info $85.00
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Headpost - 100/125 mm Black Magic Block

Black Magic blocks have 17-4 PH stainless headposts.

HFS821 1 more info $8.00
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Fastener - M6 x 1 x 20mm Socket Head Cap Screw, Black

Set screw allows shackle to be fixed or to swivel.

HBB87ASSY 2 more info

Roller Cage Assembly - 100 mm Black Magic Block

Center cage keeps Torlon® roller bearings separated and parallel to reduce friction.

HFS1271 6 more info $0.50
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Fastener - M6 x 1 x 16 mm Socket Head Cap Screw, Black

Fasten with M6 hex wrench.

MP-3039 1 more info

Headpost Collar Half - 100 mm Black Magic Double Block, Cutout

Headpost collar isolates dissimilar metals to prevent corrosion. Collar accepts set screw that fixes shackle in one direction or allows it to swivel.

MP-3037 1 more info $1.55
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Headpost Collar Half - 100/125 mm Black Magic Block

Headpost collar isolates dissimilar metals to prevent corrosion. Collar accepts set screw that fixes shackle in one direction or allows it to swivel.

AL-3757 1 more info $225.00
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Sideplate with Helicoils - 100 mm Black Magic Double Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.

AL-3758 1 more info $225.00
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Sideplate with Isolators - 100 mm Black Magic Double Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface. Dissimilar metals are isolated to prevent corrosion.

AL-3759 1 more info $390.00
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Center Sideplate - 100 mm Black Magic Double Block

Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.

MS-197 2 more info

Shear Tube - 100 mm Black Magic Double Block

The shear tube is a stainless steel reinforcement between sideplates.

H-34391A 2 more info $76.00
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Sheave Assembly - 100 mm Black Magic Block

Sheaves are Hard Lube-anodized for maximum UV protection and a smooth surface. Captive Delrin® ball bearings carry side loads.