Electro Hardware THS3004M01F07 Brass Thumb Screw 4-40

Product Description

The ELECTRO HARDWARE THS3004M01F07 is a 4-40 UNC brass thumb screw with a knurled head, designed for hand-tightened fastening applications where tools are not practical or available. The screw is made from 1F grade brass and finished in nickel for corrosion resistance. It has an overall length of 11/16 inches, a thread length of 1/2 inch, a head diameter of 5/16 inches (0.3125 inches), and a head height of 3/16 inches (0.1875 inches). The knurled head provides grip for finger-tightening without a driver. Electricians, panel builders, and equipment assemblers commonly use this fastener in control enclosures, terminal panels, and light-duty electronic assemblies.

This thumb screw suits residential and commercial applications where frequent access panels, covers, or component mounts require repeated hand removal and reinstallation. The 4-40 UNC thread is a standard size widely used in instrumentation, electrical enclosures, and light mechanical assemblies. The nickel finish provides an added layer of surface protection suitable for indoor environments. Each package contains one screw; a minimum order quantity of 10 units applies.

Key Features

• 4-40 UNC thread standard for broad compatibility with standard 4-40 tapped holes
• 1F grade brass construction per QQ-B-626B Comp 22
• Nickel finish per QQ-N-290A for surface corrosion resistance
• Knurled head allows secure finger-tightening without tools
• Thread length of 1/2 inch provides adequate engagement for typical panel thicknesses
• Compact head profile: 5/16 inches diameter, 3/16 inches height

Compatibility

Designed as a standard 4-40 UNC thumb screw for use in any application with a 4-40 tapped hole requiring hand-operated fastening, including electrical enclosures, instrument panels, and light-duty mechanical assemblies.

Installation Notes

Installation requires no tools; the knurled head is intended for hand-tightening only. Avoid applying driver torque to the head, as the knurled profile is not designed for tool engagement. Verify that the mating tapped hole conforms to 4-40 UNC thread standards before installation. Follow applicable NEC or equipment manufacturer guidelines when installing fasteners inside energized enclosures, and de-energize equipment before performing any fastener service.