The 18 mm block features stainless steel ball bearings and an integrated stainless inner race and rivet for optimal strength-to-weight. The 40 mm blocks feature composite sheaves that spin freely on Delrin® ball bearings with curved bearing races. They have no metal shackles or rivets, making them the lightest soft-attach blocks Harken has ever designed. Delrin is a registered trademark of E. I. du Pont de Nemours and Company or its affiliates.
Product Specifications
Sheave Ø (mm) 40 mm
Sheave Ø (in) 1 9/16 in
Length (mm) 88 mm
Length (in) 3 15/32 in
Weight (g) 39 g
Weight (oz) 1.4 oz
Maximum line Ø (mm) 5 mm
Maximum line Ø (in) 3/16 in
Maximum working load (kg) 125 kg
Maximum working load (lb) 275 lb
Breaking load (kg) 450 kg
Breaking load (lb) 992 lb
Footnote Max line diameter based on 18 mm block.








