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Harken 40mm Aluminum Mastcollar ESP Block

Item #


Product Description

Harken 40mm Aluminum Mastcollar ESP Block

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 halyards or limited purchase systems on cruising boats.

Use teardrop blocks for direct attachment to padeyes, mast collar posts, perforated mast collars, or in mastbase situations where leads might change.


  • Sheave Ø: 1 9/16 in (40 mm)

  • Length: 2 19/32 in (65.5 mm)

  • Weight: 2.2 oz (64 g)

  • Clevis pin Ø: 1/4 in (6 mm)

  • Maximum line Ø: 1/2 in (12 mm)

  • Maximum working load: 1250 lb (567 kg)

  • Breaking load: 2500 lb (1134 kg)

    DO NOT use Harken equipment for human suspension unless product is specifically certified and labeled for such use.