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