Gibraltar 31342SG Steel Thumb Screw 3/8-16 Knurled

Product Description

The GIBRALTAR 31342SG is a steel thumb screw with a 3/8-16 UNC thread and a knurled head, designed for hand-tightening applications where tool-free clamping or adjustment is required. The part features a swivel pad tip that pivots up to 20 degrees, allowing it to seat flush against angled or uneven surfaces without marring the workpiece. Finished in black oxide for corrosion resistance, this fastener measures 2-7/16 inches in overall length with a 1-1/4 inch head diameter and a 7/16 inch head height. It is sold as a single unit and is suited for use in mechanical assemblies, fixtures, and light industrial applications.

This thumb screw is used in applications where hand-adjustable clamping force is needed without a torque tool. The knurled head provides grip for consistent hand tightening. The swivel pad tip accommodates slight surface irregularities and is constructed from steel to withstand repeated contact loading. Typical install scenarios include machine tool fixtures, jigs, workholding setups, and equipment panels where frequent repositioning or adjustment is part of normal workflow.

Key Features

• 3/8-16 UNC thread for compatibility with standard inch-series tapped holes
• Knurled head design enables secure hand tightening without tools
• Swivel pad tip pivots up to 20 degrees to seat on angled or uneven surfaces
• Black oxide finish provides basic corrosion resistance and reduces light reflection
• No-shoulder design for straightforward thread engagement
• Steel tip material stands up to repeated clamping cycles

Compatibility

Designed for use in standard 3/8-16 UNC tapped holes in inch-measurement mechanical assemblies, fixtures, and industrial equipment requiring hand-adjustable fastening.

Installation Notes

Installation requires a matching 3/8-16 UNC tapped hole. Hand-tighten only — this fastener is not intended for torque wrench application. Ensure the swivel pad tip is properly seated against the work surface before applying clamping load. Verify that thread engagement depth in the receiving component is sufficient for the applied load before placing the assembly in service.