The 1598 U-adaptor allows blocks with up to 15 mm (19/32") posts to be attached to swivel bases or to other blocks with 15 mm (19/32") posts. Fits Harken Midrange and 75mm ESP blocks.

Shackle pin Ø (mm)
8 mm

Shackle pin Ø (in)
5/16 in

Weight (g)
44.4 g

Weight (oz)
1.57 oz

A (mm)
12 mm

A (in)
1/2 in

B (mm)
22 mm

B (in)
7/8 in

Maximum working load (kg)
817 kg

Maximum working load (lb)
1800 lb

Breaking load (kg)
1633 kg

Breaking load (lb)
3600 lb