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)
100 mm
Sheave Ø (in)
3 15/16 in
Length (mm)
193 mm
Length (in)
7 9/16 in
Weight (g)
542 g
Weight (oz)
19.12 oz
Clevis pin Ø (mm)
15.9 mm
Clevis pin Ø (in)
5/8 in
Maximum line Ø (mm)
16 mm
Maximum line Ø (in)
5/8 in
Maximum working load (kg)
3402 kg
Maximum working load (lb)
7500 lb
Breaking load (kg)
6802 kg
Breaking load (lb)
15000 lb