Gibraltar SN-4-G Swivel Hex Nut 3/8-16 Unc Steel

Product Description

The GIBRALTAR SN-4-G is a steel swivel hex nut designed for applications requiring a pivoting pad surface to distribute clamping load without marring the workpiece. Threaded to the 3/8-16 UNC standard, it features a 1/2-inch swivel pad diameter and a black oxide finish that provides mild corrosion resistance and reduces light glare on tool and fixture surfaces. The nut measures 7/16 inches across the flats, 17/32 inches in overall height, and 17/64 inches in thread depth. It is sold individually and is a common component in jig and fixture assemblies used by machinists, toolmakers, and fabricators working in inch-based systems.

This swivel hex nut is used in workholding setups, clamping fixtures, and machine tool assemblies where a hardened or finished surface must be protected from direct fastener contact. The swivel pad rotates independently of the hex body, allowing the nut to seat flush against angled or irregular surfaces without galling. Typical installations include tooling plates, vise stops, clamp straps, and custom fixturing in both job shop and production environments.

Key Features

• 3/8-16 UNC thread for compatibility with standard inch-system hardware
• Swivel pad design distributes clamping force and prevents surface damage
• 1/2-inch pad diameter provides a broad contact footprint
• Black oxide finish offers mild corrosion resistance and low-glare appearance
• Steel construction for durability under clamping loads
• Compact profile at 7/16 inches across flats and 17/32 inches tall

Compatibility

Designed as a standard replacement or add-on component for inch-based jig, fixture, and workholding assemblies using 3/8-16 UNC threaded hardware.

Installation Notes

This fastener is typically installed by machinists or toolmakers assembling or servicing fixture and workholding systems. No power-down procedures are required for most fixture applications, though installations on powered machinery should follow lockout/tagout procedures before adjustment. Use a standard 7/16-inch wrench across the hex flats. Do not exceed the load rating of the mating fixture components when applying clamping torque.