Gibraltar 74213216 Round Knurled Check Nut 1/2-13 Unc

Product Description

The GIBRALTAR 74213216 is a round knurled check nut machined from steel with a black oxide finish. Check nuts are used as locking elements threaded against a primary nut to prevent loosening under vibration or dynamic loads. This nut features a 1/2-13 UNC thread standard, a knurled round head for positive grip, and a black oxide coating that provides mild corrosion resistance and a clean appearance. At 0.05 pounds, it is a compact fastener suited for light-duty locking applications in mechanical assemblies. Machinists, maintenance technicians, and mechanical contractors install this type of hardware during assembly or repair work on equipment, jigs, fixtures, and threaded rod assemblies.

This check nut is appropriate for use in industrial, commercial, and light mechanical applications where a secondary locking nut is required on a 1/2-13 UNC threaded fastener. The round knurled head profile allows hand-tightening in accessible locations, while the black oxide steel construction holds up in dry or lightly oiled environments. It is commonly used in fabrication shops, maintenance settings, and general mechanical assembly scenarios where vibration resistance and thread security are priorities.

Key Features

• 1/2-13 UNC thread for compatibility with standard inch-series threaded assemblies
• Round knurled head profile enables hand grip for tightening without a wrench in accessible positions
• Black oxide finish provides mild corrosion resistance and reduces surface glare
• Steel construction offers durability in typical industrial and mechanical environments
• Compact 7/16-inch overall height minimizes stack-up in tight assemblies
• 1-1/4-inch head diameter and 1-inch base diameter for positive bearing surface

Compatibility

Designed as a standard check nut for use with 1/2-13 UNC threaded fasteners in mechanical assemblies, fixtures, and equipment requiring a secondary thread-locking element.

Installation Notes

Installation of check nuts is typically performed by machinists or maintenance technicians using standard open-end or box wrenches. Thread the check nut onto the fastener and tighten it firmly against the primary nut to create a locking interface. Always de-energize or lock out equipment before working on threaded mechanical assemblies in powered machinery. Verify thread engagement and ensure mating threads are free of debris or damage before installation.