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Harken 57 mm Ratchamatic® Block — Swivel, Red Sheave

Item #


Product Description

Harken 57 mm Ratchamatic® Block — Swivel, Red Sheave

The Carbo Ratchamatic® is a load-sensing ratchet block that rolls freely in both directions under low loads and automatically engages the ratchet as loads increase. Shifting between ratchet and light-air modes is seamless.


  • Sheave ¨ (mm)57 mm

  • Sheave ¨ (in)2 1/4 in

  • Length (mm)103 mm

  • Length (in)4 1/16 in

  • Weight (g)104 g

  • Weight (oz)3.7 oz

  • Shackle pin ¨ (mm)5 mm

  • Shackle pin ¨ (in)3/16 in

  • Maximum line ¨ (mm)10 mm

  • Maximum line ¨ (in) 3/8 in

  • Maximum working load (kg)227 kg

  • Maximum working load (lb)500 lb

  • Breaking load (kg)907 kg

  • Breaking load (lb)2000 lb

  • Holding power w/180 degree wrap 50 lb (23 kg) 10:1