Harken 125mm Loop Block

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The entire line of Black Magic® AirBlocks® has been redesigned with a sleek new look. Their unique, performance-packed engineering remains exactly the same. These strong, lightweight blocks feature free-rolling high-load Torlon® roller bearings for a high strength-to weight ratio.

The 3255 soft attachment Loop block has a removable dead-end post for attachment to a padeye. Lashings can also be used. 

Torlon® is a registered trademark of Solvay Advanced Polymers.

Part Number: HK3255


Sheave Ø (mm) 125 mm
Sheave Ø (in) 4 15/16 in
Length (mm) 163 mm
Length (in) 6 in
Weight (g) 674 g
Weight (oz) 23.78 oz
Maximum line Ø (mm) 19 mm
Maximum line Ø (in) 3/4 in
Maximum working load (kg) 4990 kg
Maximum working load (lb) 11000 lb
Breaking load (kg) 9977 kg
Breaking load (lb) 22000 lb


Harken Instructions

Need help to design your Harken system - take a look here for the Harken System Guides and Drawings

Or perhaps you need some other information (load calculators, block selectors, service instructions or manuals)?   Take a look here for all the official Harken Support Information