M3 Nylon Insert Lock Nut, 304 Stainless Steel - XNNA2M3

The Metric Hex Nylon Insert Lock Nut, 304 Stainless Steel is available in 11 sizes (M3 to M24) and is a hex nut with a nylon ring set into the top. The nylon grips the bolt thread and resists loosening from vibration.

Made from 304 (A2) stainless steel, a standard austenitic grade with good everyday corrosion resistance. It is a sound choice away from the coast; in chloride-exposed settings, step up to 316 (A4). Metric sizes are written M followed by the nominal thread diameter in millimetres, so M10 is a 10 mm thread.

You can choose from 11 variants, covering sizes M3 to M24. Variants are supplied in packs of 25 to 200, depending on size.

Stainless threads can gall (seize) when tightened under load or at speed. A smear of anti-seize on the thread and a steady tightening speed reduce the risk.

Where this product is used

• Signs, furniture and fittings
• Indoor architectural and joinery work
• Vibrating machinery, frames and guards
• Small sizes for enclosures, instruments and light fittings
• Food and beverage equipment
• Fresh water and general outdoor fittings

Features

• Pack quantities to suit trade and bulk buying: packs of 25 to 200
• Nylon insert grips the thread and resists loosening
• Hex form for spanner or socket tightening
• Choice of 11 sizes, M3 to M24
• Metric thread sizes match the nuts, bolts and tapped holes in most Australian-supplied equipment
• A2 (304) stainless steel for indoor, fresh water and general outdoor use

Key specifications

Selecting the right option

The nylon ring limits the working temperature of the nut, so check the supplier data before using it near heat. A nylon insert nut is normally treated as single-use where a tight lock is needed. The bolt must pass fully through the nylon ring. Use a stainless flat washer. Near the coast, around pools or in marine settings, use the A4 (316) version instead: Metric Hex Nylon Insert Lock Nut - 316 Stainless Steel.

Related products

Also available: UNC Hex Nylon Insert Lock Nut - 316 Stainless Steel and UNC Hex Nylon Insert Lock Nut - 304 Stainless Steel. Matching products: Metric Hex Bolt - 304 Stainless Steel, Metric Hex Set Bolt (Full Thread) - 304 Stainless Steel and Inox Standard Flat Round Washer - 304 Stainless Steel.