Electro Hardware THS1141M10F21 Steel Thumb Screw 1/4-20

Product Description

The ELECTRO HARDWARE THS1141M10F21 is a steel thumb screw designed for tool-free fastening in light-duty mechanical and electrical enclosure applications. It features a knurled brass head for secure finger grip and includes a shoulder for precision alignment in mating assemblies. The 1/4-20 UNC thread is a common standard fastener size found across industrial panels, junction boxes, and equipment covers. With a zinc finish over a Grade 2 steel body, this screw provides corrosion resistance suitable for indoor and light industrial environments. The overall length is 1.125 inches, and the head diameter is 0.5 inches.

This thumb screw is used in applications where frequent hand-tightening and removal is required without tools, such as access panels, instrument enclosures, rack-mounted equipment, and control cabinet covers. The shoulder design aids in precise panel alignment and reduces wear on mating holes. It is commonly installed by electricians, mechanical assemblers, and field service technicians working on equipment that requires regular access. The 1/4-20 UNC thread makes it broadly compatible with standard tapped holes in sheet metal and machined panels.

Key Features

• 1/4-20 UNC thread for compatibility with standard tapped holes
• Knurled brass head for secure finger-grip hand tightening
• With-shoulder design aids panel alignment and reduces hole wear
• Zinc finish on Grade 2 steel body for corrosion resistance
• Compact 1.125-inch overall length for use in space-constrained enclosures
• Meets multiple material and finish standards including ASTM B633

Compatibility

Designed as a standard 1/4-20 UNC thumb screw for use in tapped panel holes, enclosure covers, and instrument housings requiring tool-free fastening access.

Installation Notes

De-energize any electrical enclosure or equipment before installing or removing panel fasteners. Hand-tighten only — do not use a driver or wrench on the knurled head, as over-torquing can damage the brass head or strip the mating thread. Verify the mating tapped hole is clean and free of debris before installation. Follow applicable NEC or equipment manufacturer guidelines for enclosure fastener requirements.