
Harken 3227 57mm Single Black Magic High-Load Stand-Up Block
HARKEN 3227 Black Magic® Stand-Up AirBlock® - 57mm NEW! The entire line of Black Magic® AirBlocks® has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same. Used on offshore boats, this strong, lightweight block features 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 side plates protect sideload ball bearings. Dissimilar metals are isolated to minimize corrosion. Use for: Sheets Halyards Running backstays Specifications: Sheave Diameter - 57mm (2-1/4") Max Line Diameter - 7/16" (12mm) Mfg No. Description Length Shackle PinDiameter Max WorkingLoad BreakingLoad Weight 3227 Stand-Up* 4-1/2"(114mm) 1/4"(6mm) 2500 Lbs(1134kg) 5000 Lbs(2268kg) 7.04 oz.(200g)