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.
FootnoteMax line diameter based on 18 mm block.
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