Harken 57mm Black Magic Single Stand-up Block High 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 | 2-1/4 in
• Length 114 mm | 4-1/2 in
• Weight 210 g | 7.4 oz
• Shackle pin Ø 6 mm | 1/4 in
• Maximum line Ø 12 mm | 7/16 in
• Maximum working load 1134 kg | 2500 lb
• Breaking load 2268 kg | 5000 lb