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

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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.

Specifications Resources Spare Parts

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
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 (lb)	5000 lb
Breaking load (kg)	2268 kg
Shackle pin Ø (mm)	6 mm
Shackle pin Ø (in)	1/4 in

Photo - JPG 3215.jpg 0.08 MB Drawing - DXF 3215.DXF.zip 0.07 MB 3D drawing - IGS 3215.IGS.zip 1.33 MB Photo - EPS 3215.eps.zip 1.07 MB Drawing - DWG 3215.DWG.zip 0.07 MB

ID BOM	Qty		Price
2108	1	more info	$15.05	Add to cart
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	Add to cart
Headpost - 57mm Black Magic Single Block Black Magic blocks have 17-4 PH stainless headposts.
HFS796	3	more info	$0.32	Add to cart
Fastener - M4 x .7 x 12mm Socket Head Cap Screw, Black Fasten with M4 hex wrench.
MP-3020	3	more info	$1.07	Add to cart
Fastener Isolator - 4mm SK HD Dissimilar metals are isolated to prevent corrosion.
HFS798	1	more info	$0.37	Add to cart
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	Add to cart
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	Add to cart
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	$57.80	Add to cart
Sideplate - 57mm Black Magic Block Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.
HBB85	1	more info	$29.95	Add to cart
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	Add to cart
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.