Electro Hardware THS3002M07F16 Thumb Screw 4-40 303 Ss

Product Description

The ELECTRO HARDWARE THS3002M07F16 is a 303 stainless steel knurled head thumb screw sized for 4-40 UNC threaded applications. It features a 5/16 inch head diameter, 3/16 inch head height, and an overall length of 9/16 inch with a 3/8 inch thread length. The uncoated 303 stainless steel construction provides corrosion resistance suitable for instrumentation, panel assembly, and light mechanical enclosures. This fastener is installed by hand without tools, making it well suited for access panels, covers, and components that require frequent removal. Electricians, HVAC technicians, and panel fabricators commonly use this style of thumb screw in low-load, tool-free fastening applications.

This thumb screw is designed for use in indoor and light-duty outdoor assemblies where finger-tightened fastening is required. It is commonly found in electrical enclosures, control panels, instrument housings, and HVAC equipment access covers. The 4-40 UNC thread is a standard size in light-gauge sheet metal and machined component applications. The knurled head provides a reliable grip for hand tightening without requiring a driver. No shoulder is present, making it appropriate for flush or near-flush panel mounting configurations.

Key Features

• 303 stainless steel construction for corrosion resistance in light-duty environments
• Knurled head design allows hand tightening without tools
• 4-40 UNC thread standard for compatibility with common light-gauge panel and enclosure tapping
• 9/16 inch overall length with 3/8 inch thread engagement length
• Without-shoulder configuration suits flush panel and cover fastening
• Uncoated finish maintains dimensional tolerances and resists galling common with stainless fasteners

Compatibility

Designed as an OEM-style replacement or service fastener for any assembly requiring a 4-40 UNC knurled head thumb screw without a shoulder. Confirm thread size and engagement depth against the mating component before installation.

Installation Notes

This thumb screw is installed and removed by hand. De-energize all electrical panels and enclosures before servicing fasteners on live equipment, in accordance with NFPA 70E lockout/tagout requirements. Avoid over-tightening stainless steel fasteners into tapped stainless or aluminum threads, as galling can occur. Verify thread engagement depth against the mating tapped hole to ensure full thread engagement without bottoming out.