Harken 57mm Aluminum Footblock w/ LockoffSheave Ø - 2 1/4" (57mm)
The entire line of Black Magic® AirBlocks® has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same.
Carrying some of the highest loads imposed by running rigging, these strong, lightweight blocks feature Torlon® roller bearings housed in a center cage. Rollers stay parallel for low-friction efficiency. Sculpted hardcoat-anodized aluminum sideplates protect sideload ball bearings. Dissimilar metals are isolated to minimize corrosion. Blocks are easily disassembled with a single hex wrench.
Either metric or imperial flathead fasteners may be used for mounting and are not exposed.
Length - 3 5/16" (84mm)
Height - 1" (25mm)
Weight - 5.44 oz (154 g)
Maximum line Ø - 7/16" (12mm)
Maximum working load - 2500 lb (1134 kg)
Breaking load - 5000 lb (2268 kg)
Number of fasteners - 4
Fasteners - 1/4 FH in (6 FH mm)
A 9/32" (7mm)
B - 7/8" (23mm)
C - 2 1/32" (52mm)
D - 5/8" (16mm)
E - 2 9/32" (58mm)
F - 3 5/16" (84mm)
G - 15/32" (12mm)