Electro Hardware THS3054M01F21 Brass Knurled Thumb Screw

Product Description

The ELECTRO HARDWARE THS3054M01F21 is a brass knurled thumb screw designed for tool-free fastening in light-duty mechanical and electrical enclosure applications. It features a 1/4-20 UNC thread and measures 7/8 inches in overall length, with a knurled head that provides a secure finger grip without the need for a driver. The head diameter is 0.5 inches and the head height is 0.25 inches. The zinc finish over brass construction provides corrosion resistance suited to indoor panel, enclosure, and instrument assembly work. This fastener ships individually and is ordered in single-unit quantities.

This thumb screw is commonly used in HVAC control panels, electrical enclosures, junction boxes, and light structural assemblies where frequent access is required. Its tool-free design makes it well suited for applications that involve regular removal and reinstallation of access panels or covers. Trade professionals in HVAC, electrical, and instrumentation work rely on this style of fastener when quick panel access is part of routine service workflow.

Key Features

• 1/4-20 UNC thread for standard inch-system fastener compatibility
• Knurled head allows tool-free hand tightening and loosening
• Brass construction with zinc finish for corrosion resistance
• 0.5 inch head diameter and 0.25 inch head height for low-profile installation
• Without shoulder design for flush or recessed panel fitment
• Meets ASTM B633, QQ-B-626B Comp 22 Type 1 standards

Compatibility

Designed as a standard 1/4-20 UNC inch-system thumb screw for use in electrical enclosures, control panels, and mechanical assemblies requiring tool-free fastener access.

Installation Notes

Installation does not require tools under normal hand-tightening conditions. Always de-energize electrical panels and enclosures before servicing fasteners on live equipment covers. Verify thread engagement depth is adequate for the mating material to ensure secure retention. Do not overtighten by applying tools to the knurled head, as this may damage the brass threads.