Gibraltar 90424G Steel Thumb Screw 5/8-11 Lobed Head

Product Description

The GIBRALTAR 90424G is a heavy-duty thumb screw designed for secure, tool-optional adjustments in industrial fixtures, jigs, workholding setups, and machine assemblies. It features a lobed aluminum head for hand-tightening grip, a black oxide steel body for corrosion resistance, and a dog point tip for positive location and alignment in mating holes. The 5/8-11 UNC thread and with-shoulder construction give it the load capacity and rigidity expected in demanding trade and manufacturing environments. At 4.5 inches overall length and 0.39 pounds, it is built for repetitive use in high-cycle applications.

This thumb screw is suited for use in machine shops, fabrication environments, and industrial assembly stations where hand-operated clamping or positioning hardware is required. The dog point tip seats into locating holes or slots to prevent lateral movement during tightening. The lobed head allows significant hand torque without tools, making it practical for setups requiring frequent adjustment. It is sized for applications that demand a large-diameter head for grip and a substantial thread engagement length.

Key Features

• 5/8-11 UNC thread for high load capacity and broad tooling compatibility
• Lobed aluminum head, 2.5 inches in diameter and 1.5 inches in height, for firm hand grip
• Dog point tip, 0.4375 inches in diameter and 0.3125 inches in length, for positive locating in mating holes
• With-shoulder construction for controlled clamping depth and lateral stability
• Black oxide finish provides mild corrosion resistance and reduced surface glare
• 4.5 inches overall length suits deep-reach clamping and fixture applications

Compatibility

Designed as a standard UNC 5/8-11 threaded thumb screw for use in industrial fixtures, workholding systems, and machine tool assemblies requiring lobed-head hand hardware with a dog point tip and shoulder configuration.

Installation Notes

Installation is typically performed by machinists, toolmakers, or maintenance technicians in fabrication and industrial settings. Verify that the mating thread and dog point locating hole match the 5/8-11 UNC thread standard and 0.4375-inch tip diameter before installation. Do not use power tools to drive or remove this thumb screw, as the lobed head is intended for hand operation. Ensure mating threads are clean and free of debris to maintain proper engagement and torque.