Construction: Monocoque construction offers the best strength to weight ratio by incorporating the head block and bearing surface into the cheeks.
Bayonet Fixing: Patented bayonet fixing means that central fastenings are not required and only two locating screws are needed in the head, further reducing weight and improving performance.

Cheeks: Flush fixings and radiused edges produce snag free cheeks with engraved logo and block size.

Shackle: The three position shackle post has a drilled out head for further weight reduction.

Bearings: Torlon rollers and Delrin side thrust balls provide optimum bearing for rapid line handling.

Torlon rollers on blocks above 80mm: Captive Delrin side thrust balls will not drop out when sheave is removed.

Lewmar blocks are specified for racing sailboats such as the Mumm 30 and other high performance sailboats.

Read about Lewmar Racing Blocks Selection Guide | Lewmar Racing Blocks Dimensions

About Lewmar Synchro Blocks:

Use Chart for Cruising Sailboat Blocks: recommended block sizes

Small Boats (20 to 26 ft.): 50 and 60 mm blocks
Mid Range Boats (26 to 35 ft.): 60 and 72 mm blocks
Big Boats (40 ft. plus): 72, 90 and 105 mm blocks


Lewmar Synchro Blocks: The Swivel-Lock self-aligning head: An innovative Swivel-Lock head self aligns to the angle of the line as it comes into contact with the sheave. A precise degree of free rotational movement ensures the line load is in optimum alignment to the block.

The Free-Spin self-lubricating bearing: A high-tech composite bearing combines high compressive strength with an incredibly low coefficient of friction to deliver a free spinning sheave with enormous load capacity. The high density material, is self-lubricating for long lasting, trouble free performance.

Read about Lewmar Cruising Blocks Selection Guide | Lewmar Cruising Blocks Dimensions