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