Electro Hardware 1431M12F21-440 Hex Standoff 4-40 9/16 in

Product Description

The ELECTRO HARDWARE 1431M12F21-440 is a male-female hex circuit board standoff used to create precise spacing between PCBs and mounting surfaces in electronic assemblies. Machined from Grade 2 steel with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-S-633 standards, this fastener provides reliable corrosion resistance in panel and enclosure environments. The standoff measures 9/16 inches in overall length with a 1/4-inch hex body width across flats, a 3/8-inch body length, and uses a 4-40 thread on both the male and female ends. It is installed by electronics technicians and field service professionals working on control boards, relay panels, and low-voltage equipment assemblies.

This standoff is suited for residential and commercial control board assemblies, HVAC equipment panels, and industrial enclosures where secure PCB mounting and consistent board-to-board or board-to-chassis spacing is required. The 4-40 thread size is common in light-duty electronic hardware applications. The hex body profile allows installation and removal with standard hex drivers or wrenches without risk of slipping or surface damage on surrounding components.

Key Features

• Male-female configuration provides a threaded male post on one end and a threaded female bore on the other for stacked PCB mounting
• 4-40 thread size fits standard light-duty electronic hardware applications
• 9/16-inch overall length with 3/16-inch thread length and 3/8-inch body length for precise standoff spacing
• Hex body profile (1/4-inch width across flats) allows tool-driven installation and removal
• Zinc-plated steel finish meets ASTM B633 Type 1 and QQ-S-633 corrosion resistance standards
• Grade 2 steel construction balances strength and machinability for threaded fastener applications

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit board assemblies using 4-40 threaded hardware in standard inch-measurement systems.

Installation Notes

Installation is performed by electronics technicians or service professionals familiar with PCB hardware. Power down and de-energize any control board or panel before installing or removing standoffs to prevent damage to sensitive components. Use a properly sized hex driver or nutdriver matching the 1/4-inch width across flats to avoid rounding the hex body. Follow applicable equipment manufacturer documentation and local electrical codes when servicing control panels or enclosures.