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57mm Aluminum Block — Swivel

57mm Aluminum Block — Swivel

Part No. 3215

Sheave Ø (mm) 57 mm

Sheave Ø (in) 2 1/4 in

Maximum line Ø (mm) 12 mm

Maximum line Ø (in) 7/16 in

Maximum working load (kg) 1134 kg

Maximum working load (lb) 2500 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)57 mm
Sheave Ø (in)2 1/4 in
Length (mm)119 mm
Length (in)4 11/16 in
Weight (g)152 g
Weight (oz)5.36 oz
Shackle pin Ø (mm)6 mm
Shackle pin Ø (in)1/4 in
Maximum line Ø (mm)12 mm
Maximum line Ø (in)7/16 in
Maximum working load (kg)1134 kg
Maximum working load (lb)2500 lb
Breaking load (kg)2268 kg
Breaking load (lb)5000 lb
Composer Export17431029856BOM IDDescriptionQty1AL-3702 ALPHA CHEEK12AL-3703 BETA CHEEK13H-34389A SHEAVE ASSM.14HBB85 ROLLER CAGE ASSM.15HCP1518 SHKL. 6MM D HYBRID16HFS796 FST. 4 X .7 X 12 SHCS37HFS798 FST. 4 X .7 X 8 SHSS18MP-3020 FST. ISOLATOR39MP-3030 HD. POST COLLAR210SP-060 HEAD POST1tooltip
ID BOM Qty Price
2108 1 more info $14.05
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6mm "D" Shackle

Forged stainless steel shackles are polished to a high luster and are stamped with the screw pin diameter. "D" shackles are the most common type of shackle. They are best suited for aligned attachment points.

SP-060 1 more info $22.00
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Headpost - 57mm Black Magic Single Block

Black Magic blocks have 17-4 PH stainless headposts.

HFS796 3 more info $0.30
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Fastener - M4 x .7 x 12mm Socket Head Cap Screw, Black

Fasten with M4 hex wrench.

MP-3020 3 more info $1.00
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Fastener Isolator - 4mm SK HD

Dissimilar metals are isolated to prevent corrosion.

HFS798 1 more info $0.35
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Fastener - M4 0.7 x 8mm Stainless Steel Socket Head Shoulder Screw Cup, Black

Set screw allows shackle to be fixed or to swivel.

MP-3030 2 more info $1.50
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Headpost Collar Half - 57mm Black Magic Single 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-3702 1 more info

Sideplate with Helicoils - 57mm Black Magic Block

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

AL-3703 1 more info

Sideplate - 57mm Black Magic Block

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

HBB85 1 more info $28.00
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Roller Cage Assembly - 57mm Black Magic Block

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

H-34389A 1 more info $26.21
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Sheave Assembly - 57mm Black Magic Block

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