HARKEN BLACK MAGIC STANDUP BLOCK HL 57MM
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.
Sheave Ø (mm)
57 mm
Length (mm)
114 mm
Length (in)
4 1/2 in
Weight (g)
200 g
Weight (oz)
7.04 oz
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
Breaking load (kg)
2268 kg
Breaking load (lb)
5000 lb
Fasteners (mm)
6 mm
Fasteners (in)
1/4 in
Fastener circle (mm)
37 mm
Fastener circle (in)
1 15/32 in
A (mm)
57 mm
A (in)
2 7/32 in
B (mm)
56 mm
B (in)
2 3/16 in
C (mm)
32 mm
C (in)
1 1/4 in
Includes
Padeye