Value Collection 1-KN-31C K-lock Hex Nut 5/16-18 Ss 18-8

Product Description

The VALUE COLLECTION 1-KN-31C is a K-Lock hex nut with an integrated external tooth lock washer, manufactured from 18-8 stainless steel. This one-piece fastener combines a standard UNC hex nut with a serrated lock washer that bites into the mating surface under torque, resisting loosening caused by vibration. The 5/16-18 thread size covers a wide range of light structural and mechanical assembly applications. At 0.328 inches overall height and a 0.5-inch width across flats, it fits standard 1/2-inch drive or wrench tooling. The uncoated 18-8 stainless construction provides corrosion resistance suitable for outdoor and wet-environment installations. Licensed tradespeople and maintenance technicians reach for this hardware when a reliable locking fastener is needed without a separate lock washer component.

This fastener is suited for residential and light commercial mechanical, electrical, and plumbing panel assemblies, equipment mounting, and any application requiring vibration-resistant fastening in corrosive or high-humidity environments. The external tooth design creates multiple contact points around the washer perimeter, making it a practical choice for grounding connections, sheet metal assemblies, and equipment enclosures where a smooth bearing surface is not required. Sold in a minimum order quantity of 25 pieces per order.

Key Features

• One-piece K-Lock design combines hex nut and external tooth lock washer — no separate washer needed
• 5/16-18 UNC thread for compatibility with standard fractional fastener applications
• 18-8 stainless steel construction resists corrosion in wet and outdoor environments
• External tooth lock washer digs into mating surface to resist vibration-induced loosening
• Uncoated finish — no plating to crack, chip, or add galvanic incompatibility concerns
• Compact 0.328-inch height suits space-constrained assemblies

Compatibility

Designed for use with 5/16-18 UNC threaded fasteners in standard fractional mechanical and electrical assemblies where an external tooth locking washer interface is appropriate.

Installation Notes

Installation requires a standard 1/2-inch wrench or socket. Power down or de-energize any equipment before fastening hardware on electrical enclosures or panels, in accordance with NFPA 70 (NEC) lockout/tagout requirements. Do not overtorque stainless steel fasteners, as galling can occur — apply an anti-gall lubricant when assembling stainless-to-stainless joints. Ensure the tooth washer face contacts the workpiece surface directly for effective locking action.