Harken 125mm Standup Block

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Calculated at Checkout

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.

Part Number: HK3261


Sheave Ø (mm) 125 mm
Sheave Ø (in) 4 15/16 in
Length (mm) 230 mm
Length (in) 9 1/16 in
Weight (g) 1268 g
Weight (oz) 44.72 oz
Maximum line Ø (mm) 19 mm
Maximum line Ø (in) 3/4 in
Maximum working load (kg) 4990 kg
Maximum working load (lb) 1100 lb
Breaking load (kg) 9977 kg
Breaking load (lb) 22000 lb
A (mm) 93 mm
A (in) 3 21/32 in
B (mm) 103 mm
B (in) 4 1/32 in
C (mm) 57 mm
C (in) 2 1/4 in
Footnote Uses hole spacing and base dimensions of 648 padeye. Maximum working load decreases at varying angles.


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