Value Collection 1-KN-4C K-lock Hex Nut 4-40 Stainless Steel

Product Description

The VALUE COLLECTION 1-KN-4C is a 4-40 UNC K-Lock hex nut with an integrated external tooth lock washer, manufactured from 18-8 stainless steel. The K-Lock design combines a standard hex nut with a captive serrated washer, eliminating the need for a separate lock washer during assembly. The external teeth bite into the mating surface as the fastener is tightened, resisting loosening from vibration and torque. Overall height is 0.109 inches, width across flats is 0.25 inches, and the washer outside diameter is 0.281 inches. This fastener is appropriate for electronics, instrumentation, light mechanical assemblies, and any application requiring a compact, corrosion-resistant locking fastener at the 4-40 thread size.

This K-Lock nut is suited for light-duty mechanical and electrical panel assembly work where vibration resistance and corrosion resistance are both required. The 4-40 UNC thread size is common in control boards, enclosure hardware, instrumentation panels, and small appliance assemblies. The uncoated 18-8 stainless steel construction makes it suitable for indoor and moderately corrosive environments. Electricians, HVAC technicians, and mechanical assemblers working with small-fastener hardware will encounter this style of nut in panel and chassis work.

Key Features

• Integrated external tooth lock washer eliminates the need for a separate lock washer component
• 4-40 UNC thread standard for compatibility with common small-fastener applications
• 18-8 stainless steel construction provides corrosion resistance in moderate service environments
• Uncoated finish maintains consistent thread engagement without coating buildup
• Compact 0.109-inch overall height suits tight-clearance assembly locations
• External tooth design maximizes bite surface contact for vibration resistance

Compatibility

Designed as a standard 4-40 UNC K-Lock replacement or new-assembly fastener for control panels, electrical enclosures, instrumentation housings, and light mechanical assemblies using 4-40 threaded hardware.

Installation Notes

Installation is performed by hand-starting the nut onto a 4-40 UNC threaded stud or screw and tightening with a 0.25-inch hex wrench or appropriately sized nut driver. Ensure the mating surface is clean and flat so the external teeth seat evenly. Do not reuse K-Lock nuts after removal, as the lock teeth lose effectiveness once deformed. Follow applicable assembly standards for torque guidance on 4-40 stainless fasteners.