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57 mm Aluminum Double Block — Swivel

Part No. 3217
$365.10  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)1633 kg
Maximum working load (lb)3600 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)336 g
Weight (oz)11.86 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)1633 kg
Maximum working load (lb)3600 lb
Breaking load (kg)3267 kg
Breaking load (lb)7200 lb
DWG: 3217.DWG (open/save)
DXF: 3217.DXF (open/save)
IGS: 3217.IGS (open/save)
EPS: 3217.eps (open/save)
High-res JPG: 3217.jpg (open/save)
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