Gibraltar KN-50SS-G Check Nut 1/2-13 Unc Stainless Steel

Product Description

The GIBRALTAR KN-50SS-G is a round knurled check nut machined from stainless steel and threaded to a 1/2-13 UNC specification. Check nuts are low-profile locking nuts used to secure and jam against a primary nut or threaded component, preventing loosening under vibration or cyclical load. This part ships uncoated, leaving the base stainless steel finish exposed for corrosion-resistant service in wet, humid, or chemically active environments. The overall height is 7/16 inches, with a head diameter of 1-1/8 inches and a head height of 5/16 inches. The base measures 7/8 inches in diameter and 1/8 inches in height. Machinists, maintenance technicians, and mechanical contractors are the typical installers.

This check nut is suited for applications where thread locking and positioning are required on 1/2-13 UNC threaded assemblies. Common use cases include mechanical, HVAC, plumbing, and industrial installations where vibration resistance and corrosion durability are priorities. The stainless steel construction makes it appropriate for outdoor, washdown, and coastal service environments where carbon steel fasteners would corrode prematurely.

Key Features

• 1/2-13 UNC thread for compatibility with standard unified coarse thread assemblies
• Stainless steel construction provides inherent corrosion resistance without additional coating
• Round knurled head allows hand-tightening and fine adjustment in tight spaces
• Uncoated finish — no coating to chip, flake, or add dimensional variance
• Low-profile design: 7/16 inches overall height suits space-constrained assemblies
• Dual-diameter body with distinct head and base sections for positive seating against mating surfaces

Compatibility

Designed for use on any standard 1/2-13 UNC threaded rod, stud, or bolt requiring a check nut or jam nut configuration.

Installation Notes

Installation is performed by threading the check nut onto a 1/2-13 UNC fastener and tightening it against the primary nut or mating surface to lock position. A spanner wrench or pliers may be used for final torque if hand pressure is insufficient. Always ensure threads are clean and free of debris before installation to avoid cross-threading. De-energize or depressurize any associated system before servicing fasteners in live assemblies.