Electro Hardware THN5002M01F16 Brass Thumb Nut 4-40 Unc

Product Description

The ELECTRO HARDWARE THN5002M01F16 is a round knurled thumb nut machined from Grade B633 brass with a 4-40 UNC thread. It is designed for hand-tightening applications where tools are impractical or undesirable, such as panel access covers, instrument enclosures, and light-duty fastening points on electrical and mechanical assemblies. The knurled head provides a secure grip without requiring a wrench or driver. The uncoated bright finish leaves the brass surface exposed, which suits applications where bare metal contact is acceptable or where corrosion resistance of the brass alloy alone is sufficient.

This thumb nut is suited for use in electrical enclosures, control panels, HVAC equipment access covers, and general trade or OEM assembly work where a 4-40 UNC thread is called for. Its compact profile, with a 0.25 inch overall height and a 0.3125 inch head diameter, fits into tight clearances common in panel and instrument mounting scenarios. Installation requires no special tooling and is handled by electricians, HVAC technicians, and mechanical assemblers working with light-gauge threaded hardware.

Key Features

• 4-40 UNC thread for compatibility with standard unified coarse-thread fastener systems
• Grade B633 brass construction for inherent corrosion resistance without additional coating
• Round knurled head profile enables positive hand grip in tool-restricted spaces
• Compact 0.25 inch overall height suits shallow panel and enclosure applications
• Bright uncoated finish meets QQ-B-626B Comp 22 standard
• Lightweight at 0.76 pounds per package unit, minimizing added load in sensitive assemblies

Compatibility

Designed as an OEM-style replacement or service thumb nut for assemblies using 4-40 UNC threaded hardware in electrical, HVAC, and mechanical enclosure applications.

Installation Notes

This thumb nut is installed by hand into a mating 4-40 UNC threaded stud or insert. De-energize any electrical panel or equipment before accessing fasteners on live enclosures, in accordance with NFPA 70 lockout/tagout procedures. Do not over-torque by using tools on the knurled head, as brass threads can gall or strip under excessive force. Inspect the mating thread for damage or debris before installation to ensure full thread engagement.