Gibraltar 31042G Thumb Screw 3/8-16 Lobed Dog Point 12L14

Product Description

The GIBRALTAR 31042G is a lobed-head thumb screw designed for applications requiring tool-free manual adjustment and firm, repeatable clamping. Machined from 12L14 free-machining steel with a black oxide finish for mild corrosion resistance, this screw features a dog point tip that seats into a mating hole or indent to prevent lateral movement during tightening. The lobed aluminum head provides a positive grip surface without requiring a wrench. Overall length is 4 inches with a 2-inch head diameter and 1-inch head height. Thread size is 3/8-16 UNC. A shoulder is present between the head and the threaded section. Tip length is 3/16 inch and tip diameter is 1/4 inch.

This thumb screw is suited for use in fixturing, tooling setups, machine guarding, and industrial equipment where operators need frequent manual adjustments without tooling. The dog point and shoulder configuration make it well suited for positioning and locating applications on jigs and fixtures. Typical installers include machinists, toolmakers, maintenance technicians, and mechanical assemblers working in light to medium industrial environments.

Key Features

• 12L14 free-machining steel body with black oxide finish for mild corrosion resistance
• Lobed aluminum head allows tool-free hand tightening with positive grip
• Dog point tip seats into locating holes to prevent lateral shift under load
• Shoulder design provides a clean bearing surface between head and threaded engagement
• 3/8-16 UNC thread standard for broad hardware compatibility
• Meets TCMAI standards

Compatibility

Designed as a standard UNC thumb screw replacement or new installation component for fixturing, jigs, machine guarding, and industrial equipment requiring 3/8-16 UNC threaded inserts or tapped holes.

Installation Notes

Installation does not require tools under normal hand-tightening use, though a strap wrench may be used if higher torque is needed. Ensure the mating tapped hole or threaded insert is clean and free of debris before threading in. Verify the dog point aligns with the locating indent before applying load. Inspect the thread and shoulder condition periodically in high-cycle applications.