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57 mm Aluminum Low-Load Double Block — Swivel 57 mm Aluminum Low-Load Double Block — Swivel
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57 mm Black Magic

57 mm Aluminum Low-Load Double Block — Swivel

Part No. 3228
$370.20  In Stock
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)1250 kg
Maximum working load (lb)2755 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)132 mm
Length (in)5 3/16 in
Weight (g)342 g
Weight (oz)12.05 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)1250 kg
Maximum working load (lb)2755 lb
Breaking load (kg)2500 kg
Breaking load (lb)5510 lb
Drawing - DWG:  3228.DWG (open/save)
Drawing - DXF:  3228.DXF (open/save)
3D drawing - IGS:  3228.IGS (open/save)
Photo - EPS:  3228.eps (open/save)
Photo - JPG:  3228.jpg (open/save)
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