Gibraltar 31025G Thumb Screw 1/4-20 Lobed Head 12L14 Steel

Product Description

The GIBRALTAR 31025G is a lobed-head thumb screw machined from 12L14 free-machining steel with a black oxide finish. It features a 1/4-20 UNC thread, a shouldered body, and a dog-point tip for accurate engagement and positive alignment in mating holes. The lobed aluminum head allows hand tightening without tools. At 2-1/4 inches in overall length with a 1/8-inch dog-point tip, this screw is suited for applications where repeatable, tool-free clamping or positioning is required. It is commonly installed by machinists, mechanical assemblers, and maintenance technicians in jigs, fixtures, and machine sub-assemblies.

This thumb screw is used in industrial and manufacturing environments where hand-adjustable fasteners are needed for quick setup changes, workholding fixtures, or panel retention. The dog-point tip aids in locating the screw against a flat or into a detent, reducing movement under light loads. The black oxide finish provides mild corrosion resistance in dry indoor conditions. It is sold individually and fits standard 1/4-20 UNC threaded inserts and tapped holes.

Key Features

• 1/4-20 UNC thread for compatibility with standard tapped holes and inserts
• 12L14 steel construction for precise machining tolerance and consistent thread quality
• Lobed aluminum head enables hand tightening and loosening without tools
• Dog-point tip, 1/8 inch long and 5/32 inch in diameter, for positive location and alignment
• Shouldered body for controlled seating depth
• Black oxide finish for mild corrosion resistance in dry service environments

Compatibility

Designed for use in standard 1/4-20 UNC tapped holes in jigs, fixtures, machine panels, and similar assemblies where tool-free hand adjustment is required.

Installation Notes

Installation is performed by hand or with a light assist from a flat-blade screwdriver on the lobed head. Ensure the mating tapped hole is clean and free of debris before threading in. Do not exceed the hand-tight torque threshold, as the aluminum head is not rated for wrench application. Follow applicable machine safety lockout and tagout procedures before servicing any assembly that includes this fastener.