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57mm Aluminum Triple Block — Swivel

57mm Aluminum Triple Block — Swivel

Part No. 3219

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) 2200 kg

Maximum working load (lb) 4850 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)132 mm
Length (in)5 3/16 in
Weight (g)378 g
Weight (oz)13.34 oz
Shackle pin Ø (mm)8 mm
Shackle pin Ø (in)5/16 in
Maximum line Ø (mm)12 mm
Maximum line Ø (in)7/16 in
Maximum working load (kg)2200 kg
Maximum working load (lb)4850 lb
Breaking load (kg)4400 kg
Breaking load (lb)9700 lb
Composer Export8937561110142BOM IDDescriptionQty12116 SHKL. 8MM D HR12AL-3711 ALPHA CHEEK TRP.13AL-3712 BETA CHEEK TRP.14AL-3713 CENTER CHEEK I TRP.15AL-3714 CENTER CHEEK II TRP.16H-34389 SHEAVE ASSM.37HBB85 ROLLER CAGE ASSM.38HFS799 FST. 4 X .7 X 16MM SHSS19HFS801 FST. 4 X .7 X 55MM SHCS310MP-3031 HD. POST COLLAR211SP-061 HEAD POST1tooltip
ID BOM Qty Price
2116 1 more info $77.65
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8mm "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.

MP-3031 2 more info $1.60
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Headpost Collar Half - 57mm Black Magic Triple Block

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

MP-3020 3 more info $1.07
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Fastener Isolator - 4mm SK HD

Dissimilar metals are isolated to prevent corrosion.

HFS799 1 more info $11.75
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Fastener - M4 x .7 x 16mm Stainless Steel Socket Head Shoulder Screw Cup, Black

Set screw allows shackle to be fixed or to swivel.

HBB85 3 more info $29.95
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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 3 more info $28.05
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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.

HFS801 3 more info $8.55
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Fastener - M4 x .7 x 55mm Socket Head Cap Screw, Black

Fasten with M4 hex wrench.

SP-061 1 more info $75.95
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Headpost - 57mm Black Magic Triple Block

Black Magic blocks have 17-4 PH stainless headposts.

AL-3711 1 more info

Sideplate with Helicoils - 57mm Black Magic Triple Block

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

AL-3712 1 more info

Sideplate with Helicoils, Isolators - 57mm Black Magic Triple Block

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

AL-3713 1 more info

Center Sideplate 1 - 57mm Black Magic Triple

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

AL-3714 1 more info

Center Sideplate 2 - 57mm Black Magic Triple

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

F R E E   G R O U N D  S H I P P I N G

for orders over $100!

Valid on orders shipping within the United States

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