please note: due to significant seasonal demand, order fulfilment and customer service response times are longer than normal.

for urgent orders or customer service requests, please email us with the subject line marked "Urgent".

Harken 57mm Single Swivel Carbo Block w/ Becket

Item #


Product Description

Harken 57mm Single Swivel Carbo Block w/ Becket

Carbo AirBlocks are 60% stronger and 30% lighter than the classic Harken block. The nylon-resin sideplates are densely packed with long-glass fibers for a compact block with a high strength-to-weight ratio. Sheaves spin on high-load ball bearings with fitted races for low-friction operation. Ball bearings, sheave and sideplates UV stabilized with black additive for maximum protection. The high-load 57mm Carbo has a broad working range.

Use for main and jib sheets on centerboard and keelboats like Lightnings, Dragons, Solings, J/24s, and for mainsheet systems on catamarans.


  • Sheave dia. - 2 1/4in (57mm)

  • Length - 5 3/16in (132mm)

  • Weight w/shackle - 3.4oz (96g)

  • Shackle pin dia. - 3/16in (5mm)

  • Max. line dia. - 7/16in (10mm)

  • SWL - 792lb (360kg)

  • Breaking strength - 2380lb (1080kg)