Electro Hardware THS3004M07F16 Thumb Screw 4-40 Unc

Product Description

The ELECTRO HARDWARE THS3004M07F16 is a 303 stainless steel thumb screw with a knurled head, designed for tool-free fastening in light-duty mechanical and electrical assemblies. The 4-40 UNC thread and 1/2 inch thread length make it suitable for thin panels, enclosures, and access covers where frequent removal is required. The knurled head measures 5/16 inches in diameter and 3/16 inches in height, giving enough grip surface for reliable hand-tightening. The uncoated 303 stainless steel construction provides corrosion resistance in moderate environments without surface treatment.

This thumb screw is used in applications where hand-adjustable fastening is needed without tools, including instrument panels, electrical enclosures, HVAC control boxes, and equipment access covers. The 4-40 thread size is common in light sheet metal and panel work. It is installed by electricians, HVAC technicians, and equipment assemblers working with small-format fasteners in both field service and bench assembly settings. The 11/16 inch overall length accommodates standard panel thicknesses typical of light commercial and residential equipment.

Key Features

• 303 stainless steel construction for corrosion resistance in moderate-exposure environments
• Knurled head for secure hand-tightening without tools
• 4-40 UNC thread standard for compatibility with common light-gauge panel hardware
• 1/2 inch thread length suits thin panel and enclosure fastening
• Uncoated finish preserves base material properties without added plating
• Without-shoulder design for flush or standard panel mounting

Compatibility

Designed as an OEM-style replacement or service fastener for assemblies using 4-40 UNC thumb screws in light-duty panel, enclosure, and equipment cover applications.

Installation Notes

Install by hand into a pre-tapped 4-40 UNC threaded hole or a mating threaded insert. Power down all electrical equipment before accessing panels or enclosures secured by these fasteners. Do not use power tools to drive thumb screws, as the knurled head is designed for hand operation only and over-torquing may damage the head or strip the thread. Follow applicable NEC or equipment manufacturer guidelines when accessing energized enclosures.