Gibraltar 853305-G Round Knurled Check Nut 1/4-20 Unc

Product Description

The GIBRALTAR 853305-G is a round knurled check nut machined from steel and finished in black oxide. Check nuts, also called jam nuts or locknuts, are threaded onto a shaft or stud and tightened against a primary nut or fitting to prevent loosening under vibration or torque. This nut carries a 1/4-20 UNC thread and measures 7/32 inches in overall height, with a 3/4-inch head diameter and a 1/2-inch base diameter. The knurled head allows hand-tightening or tool-tightening in confined spaces. The black oxide finish provides mild corrosion resistance and reduces light reflection. It is commonly installed by HVAC technicians, plumbers, electricians, and millwrights wherever a secure locking fastener is required on threaded rod, panel studs, or equipment shafts.

This check nut is suited for light industrial, commercial, and residential trade applications. Typical uses include securing control panel components, locking adjustable assemblies on HVAC equipment, anchoring threaded studs on electrical enclosures, and fastening plumbing fixture trim hardware. The round knurled head profile makes it a practical choice in installations where a low-profile locking fastener with manual adjustability is preferred over a standard hex nut. Sold individually per package with a minimum order quantity of 2.

Key Features

• 1/4-20 UNC thread standard for broad compatibility with inch-series threaded fastener systems
• Round knurled head allows hand-tightening and easy tool engagement in tight spaces
• Black oxide finish provides mild corrosion resistance and a low-reflectance appearance
• Steel construction delivers reliable clamping strength for locking applications
• Low-profile check nut design at 7/32 inches overall height reduces stack height on assemblies
• 3/4-inch head diameter and 1/2-inch base diameter for stable bearing surface

Compatibility

Designed as a standard 1/4-20 UNC inch-series check nut compatible with any threaded shaft, stud, or rod carrying a 1/4-20 UNC thread form.

Installation Notes

Check nuts are typically installed by hand and then snugged with a wrench or pliers against the face of a primary nut or fitting surface. Always ensure the mating thread is clean and free of debris before installation to avoid cross-threading the steel nut. De-energize or shut off any equipment before accessing panels or assemblies where this fastener will be installed. Follow applicable mechanical and electrical codes for the specific trade application.