Gibraltar 90422G Steel Thumb Screw 3/8-16 Lobed Head

Product Description

The GIBRALTAR 90422G is a lobed-head thumb screw designed for hand-tightened fastening applications where tools are not required or practical. The fastener features a 3/8-16 UNC thread with a dog point tip for guided engagement and positive alignment during installation. The lobed aluminum head provides a firm grip surface, while the black oxide steel body adds corrosion resistance for light-duty service environments. At 2.5 inches in overall length with a 2-inch head diameter and 1-inch head height, this thumb screw suits assemblies that need a secure, finger-operated clamp or hold-down point. Installed by machinists, maintenance technicians, and assembly workers.

The 90422G fits applications in machine tool setups, fixture assemblies, and general industrial or trade equipment where frequent hand adjustment is required. The with-shoulder design positions the screw accurately in bored or shouldered holes. The 3/16-inch dog point tip with a 1/4-inch tip diameter helps locate mating parts before thread engagement, reducing misalignment during repeated removal and reinstallation cycles. Suitable for both production and maintenance environments where manual fastening is preferred over tool-driven hardware.

Key Features

• 3/8-16 UNC thread standard for broad compatibility with inch-series tapped holes
• Lobed aluminum head for hand-tightening without tools
• Dog point tip with 1/4-inch diameter and 3/16-inch length for part alignment
• With-shoulder design for accurate seating in shouldered bores
• Black oxide finish for light corrosion resistance and reduced light reflection
• Steel construction for strength and durability in light to medium-duty use

Compatibility

Designed as a replacement or aftermarket thumb screw for assemblies using 3/8-16 UNC inch-series threaded hardware with a dog point and lobed head configuration.

Installation Notes

Installation is performed by hand without tools in most applications. Ensure the mating tapped hole is clean and free of debris before threading to avoid cross-threading. The dog point tip should be seated into the mating locating feature before applying rotational force. Do not use a wrench or driver on the lobed head, as the aluminum head can be damaged by excessive torque.