Lewmar 40mm Control Single Blocks - Part #29901421

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Ideal for use with hand-held loads, Lewmar’s Control Blocks feature lightweight, performance load-bearing capacity. MRT (Metal Replacement Technology) and a stainless steel central race and balls provide a weight advantage, while Long Fibre Technology offers exceptional strength and durability. The open design allows sand and salt to be flushed out easily, keeping maintenance simple.


Very High Strength
Impact Resistant
Reduced Friction
Easy Maintenance
Optimised for hand control


Ball bearing blocks are typically used for medium and dynamic loads in:

Control line applications

Mainsail sheets for dinghies and keelboats
Spinnaker sheets, barber haulers
Genoa sheets
Dinghy applications