Electro Hardware THS1003M04F16 Aluminum Thumb Screw 4-40

Product Description

The ELECTRO HARDWARE THS1003M04F16 is an aluminum thumb screw with a 4-40 UNC thread and a knurled head designed for tool-free hand tightening in panel, enclosure, and equipment assembly applications. The head measures 0.375 inches in diameter and 0.1875 inches in height, with a brass head material and an uncoated finish. Overall length is 0.6875 inches. A shoulder is included, with a shoulder diameter of 0.312 inches and a shoulder length of 0.125 inches. The uncoated aluminum body keeps weight low while the knurled surface provides grip for repeated removal and reinstallation without tools.

This thumb screw suits light-duty fastening tasks in electrical enclosures, control panels, HVAC equipment covers, and instrumentation housings where frequent access is required. The 4-40 UNC thread is a common size in small equipment and panel assembly, making this a practical service replacement or stocking fastener for electrical and HVAC technicians. It is sold individually but must be ordered in multiples of five.

Key Features

• 4-40 UNC thread for compatibility with standard small-equipment threaded inserts
• Knurled head allows tool-free hand tightening and removal
• Shoulder design provides positive seating and alignment
• Aluminum construction keeps weight low and resists corrosion in typical indoor enclosure environments
• Brass head material for durability at the contact surface
• Meets multiple material and finish standards including ASTM B633 and QQ-A-225A Comp 2

Compatibility

Designed as a standard 4-40 UNC thumb screw for use in electrical enclosures, control panels, and light equipment assemblies requiring tool-free fastening access.

Installation Notes

Installation is performed by hand; no tools are required for normal tightening or removal. Ensure the mating threaded insert or nut matches the 4-40 UNC thread standard before installation. De-energize any panel or enclosure before servicing fasteners on live electrical equipment. Do not overtighten by using tools, as the aluminum body and knurled head are rated for hand torque only.