Electro Hardware MP421M03F21M3 Female Hex Standoff M3

Product Description

The ELECTRO HARDWARE MP421M03F21M3 is a female hex circuit board standoff designed to create fixed spacing between PCBs and mounting surfaces or between stacked boards in electronic assemblies. Machined from brass with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff offers corrosion resistance suitable for enclosed electronic equipment. The M3 x 0.5 metric thread runs the full 11 mm body length, and the hex profile measures 4.5 mm width across flats for wrench engagement. Licensed electricians, electronics technicians, and panel builders typically install these during board assembly or enclosure builds.

This standoff is used in residential and commercial electronic control panels, industrial equipment enclosures, and printed circuit board assemblies where a fully threaded female post is needed to accept an M3 screw from one or both ends. The 11 mm overall length suits standard PCB stacking heights common in HVAC control boards, power supply enclosures, and instrumentation panels. The hex body allows installation with a standard nut driver or small wrench without marring adjacent board surfaces.

Key Features

• M3 x 0.5 metric female thread, fully threaded through 11 mm body length
• Brass construction with clear zinc chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Hex body profile at 4.5 mm width across flats allows wrench installation
• Length tolerance held to -0.13 to 0.13 mm for consistent PCB stack height

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit board assemblies requiring M3 x 0.5 metric female threaded hex standoffs with an 11 mm overall length.

Installation Notes

Install and remove using a nut driver or open-end wrench sized for 4.5 mm width across flats. Always power down and de-energize the control panel or circuit board assembly before servicing mounting hardware. Avoid over-torquing brass standoffs, as the material is softer than steel and threads can strip under excessive force. Follow applicable NEC guidelines when working inside energized enclosures.