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Harken 57mm Black Magic Swivel Double Block

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Harken 57mm Black Magic Swivel Double Block
SKU #: HK_HAR3217

Regular Price: $365.10

Special Price $321.99

Availability: In stock

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




  Imperial Metric
Sheave Diameter 2 1/4 in 57 mm
Max Line Diameter 7/16 in 12 mm
Max Working Load 3,600 lb 1,633 kg
Breaking Load 7,200 lb 3,267 kg
Weight 11.86 oz 336 g
Length 5 3/16 in 132 mm
Shackle Pin Diameter 5/16 in 8 mm
Additional Information

Additional Information

Brand Harken
Gender No
Location No
Activity No
Material No
Max Working Load 3,600lb / 1,633kg
Max Line Diam 12 mm (7/16")
Length No