Harken Black Magic 57mm Single Block with Becket Low Load

Product description

Black Magic® AirBlocks®

These strong, lightweight blocks feature free-rolling, high-load Torlon® roller bearings for a high strength-to-weight ratio. Use them for sail controls that see lots of action: mainsheet, runner, halyard, and spinnaker systems.

AirBlocks® are easy to clean and service. They have few parts and no loose balls or rollers to misplace. Unlike blocks that are riveted, fasteners allow quick disassembly with a single hex wrench.

57 mm Black Magic®

Used on offshore boats, these strong, lightweight blocks feature Torlon® roller bearings for strength 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.

Torlon® is a registered trademark of Solvay Advanced Polymers.

Specifications:

• Sheave Ø 57 mm
• Sheave Ø 2 1/4 in
• Length 140 mm
• Length 5-1/2 in
• Weight 155 g
• Weight 5.5 oz
• Shackle pin Ø 6 mm
• Shackle pin Ø 1/4 in
• Maximum line Ø 12 mm
• Maximum line Ø 7/16 in
• Maximum working load 750 kg
• Maximum working load 1655 lb
• Breaking load 1500 kg
• Breaking load 3310 lb