Product
Black Magic Runner Blocks are used on running backstays of offshore boats to adjust mast bend for different wind conditions.
Integrated sideplate bails and recessed cotter key help produce a smooth design that won’t snag lifelines.
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)
75 mm
Sheave Ø (in)
2 15/16 in
Length (mm)
118 mm
Length (in)
4 5/8 in
Weight (g)
288 g
Weight (oz)
10.16 oz
Clevis pin Ø (mm)
12.7 mm
Clevis pin Ø (in)
1/2 in
Maximum line Ø (mm)
14 mm
Maximum line Ø (in)
9/16 in
Maximum working load (kg)
2268 kg
Maximum working load (lb)
5000 lb
Breaking load (kg)
4544 kg
Breaking load (lb)
10000 lb