Sea-Dog Chain Stopper for 3/16 inch to 1/4 inch Anchor Chain, 304 Stainless Steel, Part 321820-1

The Sea-Dog Chain Stopper, part number 321820-1, is built to protect your windlass and reduce the risk of an anchor free-falling while under way. It mounts alone or inside most bow rollers, working together with your anchor roller to take tension off the windlass itself. Because a windlass is not designed to hold the full load of the ground tackle at anchor, chain and rope should be secured at this chain stopper whenever the windlass is not actively deploying or retrieving the anchor. This reduces strain on the windlass motor, gearing, and mounting hardware during heavy seas or extended anchoring.

This chain stopper is sized for chain in the 3/16 inch to 1/4 inch range, making it a fit for smaller-chain ground tackle setups on boats within that chain size. It is constructed of formed 304 stainless steel, chosen for its corrosion resistance in salt and fresh water marine environments, so it holds up to repeated exposure without the finish breaking down. A larger version, part number 321825, is available separately for boats running 5/16 inch to 3/8 inch chain -- confirm your chain diameter before ordering to make sure you get the correct part.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 321820-1
• Chain Size Compatibility: 3/16 inch to 1/4 inch chain
• Material: 304 stainless steel
• Product Dimensions: 8 inches L x 4 inches W
• Weight: 0.684 pounds
• Mounting: Mounts alone or inside most bow rollers
• UPC: 035514322133

Fitment

Fits anchor chain sized 3/16 inch to 1/4 inch. For chain sized 5/16 inch to 3/8 inch, use part number 321825 instead.

Frequently Asked Questions

What chain sizes does the Sea-Dog 321820-1 chain stopper fit? It fits anchor chain sized 3/16 inch to 1/4 inch. For chain sized 5/16 inch to 3/8 inch, the Sea-Dog 321825 is the correct part instead.

Is the 321820-1 chain stopper made for a specific side, port or starboard? No, the Sea-Dog 321820-1 chain stopper is not a side-specific part -- it mounts alone or inside most bow rollers rather than being designated for one side.

What material is this chain stopper made from? It is constructed of formed 304 stainless steel, chosen for corrosion resistance in marine environments.

How much does the Sea-Dog 321820-1 weigh? This chain stopper weighs 0.684 pounds.

Do I need a bow roller to install this chain stopper? Not necessarily -- the 321820-1 chain stopper can mount on its own or inside most bow rollers.

What does a chain stopper actually do? It helps prevent damage to the windlass and reduces the risk of the anchor free-falling while under way, by working with the anchor roller to take tension off the windlass.

Should I leave my chain resting on the windlass while anchored? No -- chain and rope should be secured at the 321820-1 chain stopper when the windlass is not in use, since a windlass is not designed for the high loads of holding anchor at rest.

What is the difference between the 321820-1 and the 321825 chain stopper? The 321820-1 fits chain sized 3/16 inch to 1/4 inch, while the 321825 is the version sized for 5/16 inch to 3/8 inch chain -- pick based on your chain diameter.

What are the dimensions of the Sea-Dog 321820-1 chain stopper? It measures 8 inches long by 4 inches wide.

Is this a genuine Sea-Dog part? Yes, this is the genuine Sea-Dog chain stopper, manufacturer part number 321820-1.

Will this chain stopper resist corrosion in saltwater? Yes -- the 321820-1 is made of formed 304 stainless steel specifically for corrosion resistance in marine use.