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Harken 57mm Black Magic Stand-Up Block

$315.25 $277.99
(You save $37.26)
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Harken 57mm Black Magic Stand-Up Block

The Harken Black Magic Air Blocks have been redesigned with a sleek new look. Their unique, performance packed engineering remains exactly the same.

Used on offshore boats, these strong, lightweight blocks feature free-rolling, high load Torlon® roller bearings for a high strength-to-weight ratio and reduced wear. Rollers are housed in a center cage and stay parallel for low-friction efficiency. Sculpted hardcoat-anodized aluminum sideplates protect sideload ball bearings. Dissimilar metals are isolated to minimize corrosion.

Like all Air Blocks, the three-way head can be locked in either direction or can swivel freely to keep line from twisting.

Use for:

Sheets, Halyards, Running Backstays, Control Lines

Includes Padeye



  Imperial Metric
Sheave Diameter 2 1/4 in 57 mm
Max Line Diameter 7/16 in 12 mm
Max Working Load 2,500 lb 1,134 kg
Breaking Load 5,000 lb 2,268 kg
Weight 7.04 oz 200 g
Length 4 1/2 in 114 mm
Fasteners 1/4 in 6 mm
Fastener Circle 1 15/32 in 37 mm
A (refer to picture) 2 7/32 in 57 mm
B (refer to picture) 2 3/16 in 56 mm
C (refer to picture) 1 1/4 in 32 mm

Includes Padeye