Sea-Dog Stainless Steel Chain Stopper 321825-1 for 5/16 to 3/8 Inch Anchor Chain

The Sea-Dog Chain Stopper 321825-1 is a formed 304 stainless steel deck fitting that takes tension off your windlass by securing the anchor chain in place. It mounts alone or inside most bow rollers and works together with your anchor roller to hold the chain under load, helping prevent damage to the windlass and reducing the risk of an accidental free fall of the anchor while under way. Chain and rope should be secured at the chain stopper when the windlass is not in use, since the windlass itself is not designed to carry those high loads at anchor.

This chain stopper is sized for 5/16 inch to 3/8 inch anchor chain. It is built from corrosion resistant formed 304 stainless steel for long-term use in a marine environment, and is finished to match other Sea-Dog deck hardware. A 3/8 inch flat head fastener is used with the unit. The part is supplied as a single unit.

Specifications

• Brand: Sea-Dog
• Manufacturer Part Number: 321825-1
• Product Name: Chain Stopper
• Material: Formed 304 Stainless Steel
• Chain Size Range: 5/16 inch to 3/8 inch
• Dimension A: 3-1/8 inch
• Dimension B: 2-3/8 inch
• Dimension C: 2-7/16 inch
• Dimension D: 3-5/8 inch
• Dimension E: 1/2 inch
• Dimension F: 1-7/8 inch
• Fastener Size: 3/8 inch FH
• Weight: 1.44 pounds
• Standard Pack: 1 each

Fitment

• Fits anchor chain sizes 5/16 inch to 3/8 inch
• Mounts alone or inside most bow rollers

Frequently Asked Questions

What chain sizes does the Sea-Dog 321825-1 chain stopper fit? The Sea-Dog 321825-1 fits anchor chain sizes from 5/16 inch to 3/8 inch.

What is this chain stopper made of? It is made of formed 304 stainless steel, chosen for corrosion resistance in a marine environment.

Can the 321825-1 be mounted inside a bow roller? Yes, this chain stopper mounts alone or inside most bow rollers and works with the anchor roller to take tension off the windlass.

Why do I need a chain stopper if I already have a windlass? A windlass is not designed to carry the high loads of holding a boat at anchor, so the chain and rope should be secured at the Sea-Dog 321825-1 chain stopper whenever the windlass is not actively hauling or lowering the anchor.

What does the chain stopper protect against? The 321825-1 helps prevent damage to the windlass and reduces the risk of the anchor free-falling accidentally while the boat is under way.

What are the overall dimensions of the 321825-1? The Sea-Dog 321825-1 measures 3-1/8 inch (A) by 2-3/8 inch (B) by 2-7/16 inch (C) by 3-5/8 inch (D), with a 1/2 inch dimension E and a 1-7/8 inch dimension F.

How much does the chain stopper weigh? The Sea-Dog 321825-1 weighs 1.44 pounds.

What size fastener is used with this part? A 3/8 inch flat head (FH) fastener is used with the 321825-1 chain stopper.

How many units come in a pack? The 321825-1 is packaged as a standard pack of 1 each.

Is the 321825-1 the same as the Sea-Dog 321820-1 chain stopper? No, the 321825-1 is a distinct, larger size fitted for 5/16 inch to 3/8 inch chain, while the Sea-Dog 321820-1 is a separate part number sized for 3/16 inch to 1/4 inch chain.

Is this a genuine Sea-Dog part? Yes, the 321825-1 is a genuine Sea-Dog chain stopper, not an aftermarket copy.