Customer notice: We are delighted to announce that we have re-opened our Port Solent store. We have implemented several social distancing measures to keep our customers and staff safe. These include a one-way system with separate entrance and exit, hand sanitiser station and 2m markings around the store. See full COVID-19 measures and restrictions here.

Our temporary opening hours are 8am - 5pm Monday-Saturday & 9am - 5pm Sunday.

Lewmar Synchro Halyard Blocks

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Lewmar Synchro Halyard Blocks







Lewmar's Synchro blocks are engineered for speed, efficiency and superior handling. We use a combination of scientifically optimised block geometry, a Free-Spin bearing and self-aligning head to reduce friction and increase efficiency by up to 40% over budget blocks on mainsheet systems. Each component is perfectly synchronised with the movement of the rope, providing you with an easier, smoother transfer of power from deck to sail and less wear on your rope.

  • Stainless steel strap for improved strength and longer service life
  • Stiff glass fibre reinforced cheeks to prevent lines from wedging
  • Innovative design with “tool-free” sliding swivel locking mechanism
  • Practical switch from swivelling to fixed shackle
Plain bearing blocks are typically used for heavy and static loads in:
  • Halyard tuning
  • Mainsheet systems
  • Mast foot blocks
  • Mast head blocks
  • Boom vang
The toggle heads of the halyard blocks are designed to fit on the studs commonly found at mast bases - check the diameter of the stud against the width of the block jaws and pin diameter.

Sheave Diameter  | Optimum Line Size  | Max Line Size  | Working Load Limit  | Weight  | Width  | Pin Diameter  | Space to Pin
50mm   6mm   10mm   450kg   73g   13mm   5mm   8.2mm
60mm   8mm   10mm   800kg   122g   15mm   6mm   6.9mm
72mm   10mm   12mm   1100kg   198g   18mm   8mm   9.6mm
90mm   12mm   14mm   2000kg   414g   23mm   10mm   13.9mm
Size/ColourPart NumberStock AvailabilityPrice
50mmY29925021 7 at 11/08 17:23 £14.95 Add to Basket
60mmY29926021 13 at 11/08 17:23 £22.95 Add to Basket
72mmY29927221 7 at 11/08 17:23 £34.95 Add to Basket
90mm99530129 3 at 11/08 17:23 £99.95 Add to Basket