Electro Hardware THS3056M10F21 Steel Thumb Screw 1/4-20

Product Description

The ELECTRO HARDWARE THS3056M10F21 is a steel thumb screw with a knurled head, designed for hand-tightening applications where tools are not practical or necessary. It carries a 1/4-20 UNC thread standard and measures 1 inch in overall length with a 3/4-inch thread length. The head diameter is 0.5 inches and the head height is 0.25 inches. A zinc finish provides basic corrosion resistance for general service environments. Material Grade 2 steel construction meets ASTM B633 and QQ-S-633 Type 1 standards. This fastener is installed by HVAC technicians, electricians, plumbers, and general tradespeople wherever quick-access panel fastening is required.

This thumb screw is suited for equipment panels, enclosures, junction boxes, and access covers in residential and light commercial applications. It is commonly used in situations where frequent removal and reinstallation of covers or guards is expected, reducing the need for hand tools during routine service calls. The knurled head provides positive grip even with gloved hands.

Key Features

• 1/4-20 UNC thread for broad compatibility with standard tapped holes
• Knurled head allows hand-tightening without tools
• Zinc finish meets ASTM B633 and QQ-S-633 Type 1 standards
• 1 inch overall length with 3/4-inch thread engagement
• Head diameter of 0.5 inches and head height of 0.25 inches
• Without-shoulder design for flush or near-flush seating against panel surfaces

Compatibility

Designed as a standard 1/4-20 UNC thumb screw for use in any application with a matching tapped hole, including equipment enclosures, access panels, and cover plates requiring tool-free fastening.

Installation Notes

This fastener is installed by hand into any 1/4-20 UNC tapped hole. Always de-energize electrical equipment or shut off fluid systems before removing panels secured by these screws. Do not over-torque by adding tools to the knurled head, as the head is designed for hand pressure only. Follow applicable NEC, IPC, or IFGC requirements for panel access and re-securing of covers in your jurisdiction.