Harken 57mm Aluminum Mast Collar ESP Block

Item Number: 6050

Cruising ESP blocks complement our existing blocks in looks and function, but are simpler in design and construction.

Sheaves feature sleeve bearings to handle high static loads and are ideal for alyards or limited purchase systems on cruising boats.


  • Sheave Ø (mm): 57 mm
  • Sheave Ø (in): 2 1/4 in
  • Length (mm): 93.5 mm
  • Length (in): 3 11/16 in
  • Weight (g): 122 g
  • Weight (oz): 4.3 oz
  • Clevis pin Ø (mm): 8 mm
  • Clevis pin Ø (in): 5/16 in
  • Maximum line Ø (mm): 16 mm
  • Maximum line Ø (in): 5/8 in
  • Maximum working load (kg): 850 kg
  • Maximum working load (lb): 2100 lb
  • Breaking load (kg): 1900 kg
  • Breaking load (lb): 4190 lb

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