1" UNC Hex Lock Nut, 316 Stainless Steel - XLNA41UNC

Made in 316 (A4) stainless steel, the UNC Hex Lock Nut is a hex lock nut. A lock nut is designed to resist loosening under vibration better than a plain hex nut.

Supplied in 316 (A4) stainless steel. The molybdenum in A4 gives better resistance to chlorides than A2 (304), so it is the usual choice near the coast, around pools and in marine and food-processing environments. UNC (Unified National Coarse) is the coarse inch-based thread. Small sizes are given as a number and threads per inch, such as 8-32 or 10-24, and larger sizes as fractions of an inch.

This listing has 9 variants covering sizes 1/4" to 1". Variants are supplied in packs of 25 to 100, depending on size.

Austenitic stainless steel is generally non-magnetic, although cold-worked parts can show weak magnetism. 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

• Boat, jetty and waterfront structures
• Food and beverage equipment
• Outdoor fittings exposed to salt air
• Vibrating machinery, frames and guards
• Replacement fasteners for imported, inch-sized equipment
• Marine, coastal and washdown fittings

Features

• A4 (316) stainless steel with molybdenum, for coastal and chloride-exposed settings
• Supplied in packs of 25 to 100
• Range covers 1/4" to 1" in 9 variants
• Designed to resist loosening under vibration
• Hex form for spanner or socket tightening
• UNC (inch) thread for equipment built to inch sizes

Key specifications

Selecting the right option

The locking method (for example nylon insert or all-metal) varies between suppliers, so check a sample if the locking method matters for your use. Match the thread system, diameter and pitch to the bolt. Use anti-seize on the thread. For indoor and general outdoor use where chlorides are not a concern, the A2 (304) version is the lower-cost option: UNC Hex Lock Nut - 304 Stainless Steel.

Related products

Other versions in this range: Metric Hex Lock Nut - 304 Stainless Steel (M4 to M20) and Metric Hex Lock Nut - 304 Stainless Steel. Matching products: UNC Hex Bolt - 316 Stainless Steel and UNC Hex Set Bolt (Full Thread) - 316 Stainless Steel.