Harken 75mm Aluminum Footblock - Lockoff

Item #


Product Description

Harken Black Magic Footblock


Sheave Ø (mm)75 mm

Sheave Ø (in)2 15/16 in

Length (mm)111 mm

Length (in)4 3/8 in

Height (mm)32 mm

Height (in)1 1/4 in

Weight (g)320 g

Weight (oz)11.28 oz

Maximum line Ø (mm)14 mm

Maximum line Ø (in)9/16 in

Maximum working load (kg)2380 kg

Maximum working load (lb)5250 lb

Breaking load (kg)4762 kg

Breaking load (lb)10500 lb

Number of fasteners4

Fasteners (mm)8 FH mm

Fasteners (in)5/16 FH in

A (mm)10 mm

A (in)3/8 in

B (mm)29 mm

B (in)1 1/8 in

C (mm)71 mm

C (in)2 13/16 in

D (mm)21 mm

D (in)13/16 in

E (mm)76 mm

E (in)3 in

F (mm)110 mm

F (in)4 5/16 in

G (mm)16 mm

G (in)5/8 in


The entire line of Black Magic® AirBlocks® has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same.

Carrying some of the highest loads imposed by running rigging, these strong, lightweight blocks feature Torlon® roller bearings housed in a center cage. Rollers stay parallel for low-friction efficiency. Sculpted hardcoat-anodized aluminum sideplates protect sideload ball bearings. Dissimilar metals are isolated to minimize corrosion. Blocks are easily disassembled with a single hex wrench.

Either metric or imperial flathead fasteners may be used for mounting and are not exposed.