Electro Hardware THS3003M07F16 Thumb Screw 4-40 Unc

Product Description

The ELECTRO HARDWARE THS3003M07F16 is a 303 stainless steel thumb screw with a knurled head, designed for tool-free fastening in light-duty mechanical assemblies, enclosures, and instrumentation panels. The 4-40 UNC thread and 5/8-inch overall length make it a standard choice for small-format hardware applications. The knurled head provides positive finger grip without requiring a driver. At 0.014 pounds per fastener, this screw is suited for weight-sensitive assemblies. The uncoated 303 stainless steel construction offers good corrosion resistance and is non-magnetic, making it appropriate for environments where standard steel fasteners are not acceptable. This fastener conforms to QQ-S-763 material standards.

This thumb screw is used in residential and commercial applications wherever hand-adjustable fastening is required. Typical installations include electronic enclosures, HVAC control panels, access covers, instrument housings, and light mechanical assemblies. It is installed by electricians, HVAC technicians, and mechanical assemblers during panel fabrication, equipment service, or field repairs where frequent removal and reinstallation of covers or components is expected.

Key Features

• 303 stainless steel construction conforming to QQ-S-763 material standard
• 4-40 UNC thread for compatibility with standard small-format tapped holes
• Knurled head design allows tool-free hand tightening and removal
• 5/16-inch head diameter with 3/16-inch head height for low-profile seating
• 7/16-inch thread length on 5/8-inch overall body
• Uncoated finish with no shoulder for straightforward through-hole installation

Compatibility

Designed as a standard 4-40 UNC thumb screw for use in any tapped or threaded insert accepting a 4-40 UNC fastener, including electronic enclosures, control panels, and instrument housings.

Installation Notes

This fastener is installed by hand in pre-tapped 4-40 UNC holes or threaded inserts. Ensure the mating thread is clean and free of debris before installation. Do not over-torque; thumb screws are intended for finger-tight seating only and can be damaged by tool-driven installation. Follow applicable assembly specifications for the host equipment when determining engagement depth.