0item in your cart

57 mm Aluminum Block - Stand-Up Spring

57 mm Aluminum Block - Stand-Up Spring

Part No. HBB328

Sheave Ø (mm) 57 mm

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

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. Sideplates and sheaves Hard Lube-anodized for maximum UV protection and a smooth surface. Center cage keeps Torlon® roller bearings separated and parallel to reduce friction. Torlon is a registered trademark of Solvay Advanced Polymers L.L.C.
Sheave Ø (mm)57 mm
Length (mm)114 mm
Length (in)4 1/2 in
Weight (g)193 g
Weight (oz)6.81 oz
Maximum line Ø (mm)12 mm
Maximum line Ø (in)7/16 in
Fasteners (mm)6 mm
Fasteners (in)1/4 in
Maximum working load (kg)1134 kg
Maximum working load (lb)2500 lb
Breaking load (lb)5000 lb
Breaking load (kg)2268 kg
A (mm)57 mm
A (in)2 7/32 in
B (mm)56 mm
B (in)2 3/16 in
Fastener circle (mm)37 mm
Fastener circle (in)1 15/32 in
C (mm)32 mm
C (in)1 1/4 in