Lewmar 66840079 Chain Stopper with Lever, 10mm / 3/8 Inch Chain, 316 Stainless Steel

The Lewmar 66840079 is a cast 316 stainless steel chain stopper with lever-operated claw, built to secure ground tackle chain when the boat is at anchor and the windlass is not in use. A windlass is not designed to hold high anchoring loads on its own; a chain stopper transfers that load off the windlass gypsy and onto a dedicated load-bearing fitting, protecting the windlass motor and gearbox from strain during overnight anchoring or extended stops. The lever mechanism allows the claw to be opened and closed by hand to capture a chain link and lock the rode in place, then released quickly when it is time to weigh anchor.

This chain stopper is sized for 10mm (3/8 inch) chain and is finished in 316 stainless steel for corrosion resistance in a marine environment. It is part of Lewmar's cast stainless chain stopper range, designed to combine a compact deck footprint with a secure, positive lock on the chain.

Specifications

• Brand: Lewmar
• Manufacturer Part Number: 66840079
• Type: Chain Stopper with Lever
• Chain Size: 10 mm / 3/8 inch
• Material: 316 Stainless Steel
• Product Dimensions: 18 x 10 x 6 inches
• Weight: 3.18 pounds
• UPC: 743683328404

Fitment

• Fits 10mm (3/8 inch) anchor chain

Frequently Asked Questions

What chain size does the Lewmar 66840079 chain stopper fit? It is sized for 10mm (3/8 inch) chain, matching the chain size stamped into the part number designation.

Why do I need a chain stopper if I already have a windlass? Windlasses are not designed to hold high loads while a boat is at anchor, so the chain should be secured with a chain stopper such as the Lewmar 66840079 whenever the windlass is not actively being used, taking the anchoring load off the windlass gearbox.

What material is the Lewmar 66840079 made from? It is made from cast 316 stainless steel, chosen for its corrosion resistance in saltwater and marine deck environments.

How does the lever on this chain stopper work? The Lewmar 66840079 uses a lever-operated claw that opens to capture a link of chain and closes to lock the rode in place, allowing quick release when it is time to raise anchor.

What are the dimensions of the Lewmar 66840079 chain stopper? The unit measures 18 x 10 x 6 inches and weighs 3.18 pounds.

How much does the Lewmar 66840079 chain stopper weigh? It weighs 3.18 pounds.

Can this chain stopper be used with rope rode instead of chain? The Lewmar 66840079 is designed to secure chain; for rope rode, the rope should instead be attached to a load-bearing point such as a cleat.

Is the Lewmar 66840079 genuine Lewmar hardware? Yes, it is a genuine Lewmar part, number 66840079, from Lewmar's cast stainless chain stopper range.

When should the chain stopper be engaged? It should be engaged whenever the boat is at anchor and the windlass is not in use, so the anchoring load is held by the chain stopper rather than the windlass.

Does the Lewmar 66840079 include mounting hardware? The listing covers the Lewmar 66840079 chain stopper with lever and claw assembly; check the specific dimensions and deck layout before ordering to confirm it suits your installation.