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57mm Aluminum Low-Load Block — Swivel

57mm Aluminum Low-Load Block — Swivel

Part No. 3226

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) 750 kg

Maximum working load (lb) 1655 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. Low-load blocks have red isolators. They use Torlon® rollers and 316 stainless steel shackles. Standard blocks have 17-4 PH stainless headposts. 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)154 g
Weight (oz)5.44 oz
Maximum line Ø (mm)12 mm
Maximum line Ø (in)7/16 in
Maximum working load (kg)750 kg
Maximum working load (lb)1655 lb
Breaking load (lb)3300 lb
Breaking load (kg)1500 kg
Shackle pin Ø (mm)6 mm
Shackle pin Ø (in)1/4 in
Composer Export72453810916BOM IDDescriptionQty12108 SHKL. 6MM D12AL-3702 ALPHA CHEEK13AL-3703 BETA CHEEK14H-34389A SHV. ASSM.15HBB85 ROLLER CAGE ASSM.16HFS796 FST. 4 X .7 X 12MM SHCS37HFS798 FST. 4 X .7 X 8MM SHSS18MP-3026 FST. ISOLATOR39MP_3030 HD. POST COLLAR210SP-060 HEAD POST1tooltip
ID BOM Qty Price
2108 1 more info $15.05
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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 $23.55
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Headpost - 57mm Black Magic Single Block

Black Magic blocks have 17-4 PH stainless headposts.

HFS796 3 more info $0.32
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Fastener - M4 x .7 x 12mm Socket Head Cap Screw, Black

Fasten with M4 hex wrench.

HFS798 1 more info $0.37
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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 $1.60
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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 $57.80
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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 $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 1 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.

Harken US Offices will be closed for Memorial Day. Any orders placed after 1pm on Friday May 27th will be processed Tuesday May 31st when offices reopen.

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