Lock Nuts – Best 316 Stainless Steel Nylon Insert Lock Nuts, Box of 1000

Description

Lock nuts keep your hardware tight when ordinary nuts would work loose. Each of our nylon insert lock nuts has a nylon ring built into the top of the nut. As you thread it onto the bolt, the nylon grips the threads and holds the nut in place, so it resists backing off from motion, vibration, and everyday use. Our stainless steel lock nuts are made from 316 stainless steel, a marine-grade alloy built to resist rust and corrosion, and they’re waxed to prevent galling so they thread on smoothly. They come in 1/4-20, 5/16-18, and 3/8-16 sizes, and every size ships in a bulk box of 1000.

Why Nylon Insert Lock Nuts

Outdoor furniture moves. Gliders glide, rockers rock, porch swings swing, and benches get sat on and shifted every day. All that motion can slowly loosen a standard hex nut until the joint starts to wobble or squeak. Nylon insert lock nuts, often called nylock nuts, solve that problem. The nylon collar creates constant friction against the bolt threads, so the nut stays where you tightened it without needing a second jam nut or thread-locking compound.

• Resists loosening – The nylon insert grips the threads to help the nut hold its position through movement and vibration.
• No extra parts – Locking action is built in, so there’s no need for a second nut or liquid thread locker.
• Clean, finished look – A single compact nut gives a neat appearance on furniture and outdoor builds.

Why 316 Stainless Steel

316 stainless steel is a marine-grade alloy with excellent resistance to rust and corrosion, the same type of steel used on boats, docks, and coastal hardware. Outdoor furniture and structures face rain, humidity, snow, pool water, and salt air all year. Plain steel or zinc-plated nuts can rust, stain the surrounding material, and seize onto the bolt. 316 stainless steel lock nuts stay clean, keep their finish, and come off when you need them to.

Pairing 316 stainless lock nuts with 316 stainless bolts and washers keeps the whole joint the same material, so you avoid mixing metals that can corrode each other outdoors.

Waxed to Prevent Galling

When stainless steel threads rub against stainless steel threads, they can gall, meaning the threads bind and seize partway on. Our lock nuts are waxed to prevent galling, so they spin on smoothly and tighten cleanly. That means faster assembly and fewer stuck or damaged bolts.

Choose Your Size

Match the lock nut to your bolt’s diameter and thread:

• 1/4-20 – Fits 1/4 inch bolts with 20 threads per inch. Box of 1000.
• 5/16-18 – Fits 5/16 inch bolts with 18 threads per inch. Box of 1000.
• 3/8-16 – Fits 3/8 inch bolts with 16 threads per inch. Box of 1000.

Bulk boxes give furniture builders, repair shops, contractors, and dealers a steady supply at a low cost per nut.

Perfect for Poly Furniture and Outdoor Projects

Our nylon insert lock nuts are ideal for poly furniture, including gliders, rockers, porch swings, Adirondack chairs, benches, and picnic tables, especially at pivot points and joints that move. They also work well on decks, docks, playsets, swing sets, gates, and fences. Pair them with our 316 stainless steel carriage bolts, wafer head bolts, and flat washers for a complete rust-resistant fastening system.

Easy Installation

Place a flat washer on the bolt, then thread the lock nut on by hand until you reach the nylon insert. From there, finish tightening with a wrench. You’ll feel more resistance once the nylon engages, which is normal. Tighten until snug. In poly lumber, avoid over-tightening, which can compress or distort the material. For the best grip, use a fresh lock nut whenever you take a joint apart and reassemble it.

Simple Care Tips

• Inspect outdoor hardware at the start of each season
• Check moving joints on gliders, rockers, and swings for any looseness
• Rinse away dirt and debris, especially near pools or the coast
• Keep spare lock nuts on hand for repairs and reassembly

Built to Stay Tight Outdoors

Give your outdoor projects hardware that holds. Our 316 stainless steel nylon insert lock nuts are rust-resistant, waxed for smooth installation, and packed in bulk boxes of 1000. They’re the essential choice for poly furniture and outdoor builds that move and live outside year-round.