Electro Hardware THS3002M04F16 Aluminum Thumb Screw 4-40

Product Description

The ELECTRO HARDWARE THS3002M04F16 is an aluminum thumb screw with a knurled head, designed for tool-free fastening in light-duty assemblies. It features a 4-40 UNC thread and an overall length of 9/16 inches. The knurled head profile allows reliable finger-tightening without a driver, making it a common choice in panel work, enclosure assembly, and instrument mounting. The part ships uncoated and is manufactured to QQ-A-225A Comp 2 and T-3 standards. Typical installers include electricians, panel builders, and technicians working on control enclosures or equipment covers where frequent access is required.

This thumb screw is suited for residential and commercial applications wherever a 4-40 UNC fastener is specified and hand-adjustable access is needed. Common install scenarios include electronics enclosures, HVAC control panels, and instrumentation housings. The without-shoulder design seats directly against the mating surface, and the 3/8 inch thread length provides adequate engagement for standard panel stock. No shoulder means the grip transitions directly into the threaded shank, which keeps the installed profile compact.

Key Features

• 4-40 UNC thread for compatibility with standard tapped holes in light-gauge panels and enclosures
• Knurled head allows tool-free tightening and loosening by hand
• Aluminum construction keeps weight low and resists corrosion in typical indoor environments
• Without-shoulder design for a compact, low-profile installation
• Manufactured to QQ-A-225A Comp 2 and T-3 standards for material compliance
• Uncoated finish suitable for applications where bare aluminum is acceptable

Compatibility

Designed as a standard 4-40 UNC thumb screw for use in any assembly or enclosure that accepts a 4-40 tapped hole with a thread engagement depth compatible with the 3/8 inch thread length.

Installation Notes

Installation requires no special tools due to the knurled thumb head, but ensure the mating tapped hole is clean and free of debris before threading. Do not overtighten by hand, as aluminum threads can strip in harder mating materials if forced. Power down or de-energize any panel or enclosure before servicing fasteners on live electrical equipment. Follow applicable NEC guidelines when working inside energized enclosures.