57mm Aluminum Double Block — Swivel

Part No. 3217

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) 1633 kg

Maximum working load (lb) 3600 lb

$435.40

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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)	132 mm
Length (in)	5 3/16 in
Weight (g)	336 g
Weight (oz)	11.86 oz
Maximum line Ø (mm)	12 mm
Maximum line Ø (in)	7/16 in
Maximum working load (kg)	1633 kg
Maximum working load (lb)	3600 lb
Breaking load (lb)	7200 lb
Breaking load (kg)	3267 kg
Shackle pin Ø (mm)	8 mm
Shackle pin Ø (in)	5/16 in

Photo - EPS 3217.eps.zip 1.12 MB 3D drawing - IGS 3217.IGS.zip 1.39 MB Drawing - DXF 3217.DXF.zip 0.06 MB Photo - JPG 3217.jpg 0.08 MB Drawing - DWG 3217.DWG.zip 0.06 MB

ID BOM	Qty		Price
2116	1	more info	$77.65	Add to cart
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.
HFS796	4	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	5	more info	$1.07	Add to cart
Fastener Isolator - 4mm SK HD Dissimilar metals are isolated to prevent corrosion.
HBB85	2	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	2	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.
SP-067	1	more info	$37.45	Add to cart
Headpost - 57/75mm Black Magic Block Black Magic blocks have 17-4 PH stainless headposts.
MP-3033	1	more info	$1.60	Add to cart
Headpost Collar Half - 57/75mm 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.
MP-3042	1	more info	$0.96	Add to cart
Headpost Collar Half - 57mm 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.
AL-3707	1	more info	$74.90	Add to cart
Sideplate with Helicoils - 57mm Black Magic Double Block Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.
AL-3706	-	more info	$80.25	Add to cart
Center Sideplate - 57mm Black Magic Double Block Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.
AL-3708	1	more info	$74.90	Add to cart
Sideplate - 57mm Black Magic Double Block Sideplates are Hard Lube-anodized for maximum UV protection and a smooth surface.
HFS1273	1	more info	$1.85	Add to cart
Fastener - M4 x .7 x 8mm Stainless Steel Socket Head Shoulder Screw Cup, Black Set screw allows shackle to be fixed or to swivel.
HFS797	1	more info	$1.28	Add to cart
Fastener - M4 x .7 x 35mm Socket Head Cap Screw, Black Fasten with M4 hex wrench.
MS-195	2	more info	$15.25	Add to cart
Shear Tube - 57mm Black Magic Double Block The shear tube is a stainless steel reinforcement between sideplates.