Electro Hardware MP441M03F21M3 Female Hex Standoff M3

Product Description

The ELECTRO HARDWARE MP441M03F21M3 is a female hex circuit board standoff designed to create measured spacing between PCBs and mounting surfaces 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 provides corrosion resistance alongside reliable electrical isolation. The M3 x 0.5 fully threaded female interior runs the full 21 mm body length, allowing a mating male screw to engage from either end. The hex body profile measures 4.5 mm across flats, providing a clean grip surface for installation with standard hex tooling.

This standoff is suited for use in control boards, relay panels, industrial enclosures, and electronic equipment where consistent PCB-to-surface standoff height is required. The metric M3 x 0.5 thread size is common in lightweight electronic assemblies, telecom hardware, and automation control panels. Electricians, electronics technicians, and panel builders typically install these during board mounting, chassis assembly, or replacement of damaged standoffs on existing equipment.

Key Features

• M3 x 0.5 fully threaded female interior with 21 mm thread depth
• 21 mm overall length for precise PCB standoff height
• Hexagonal body at 4.5 mm width across flats for wrench engagement
• Brass construction with clear zinc chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards
• Length tolerance of -0.13 to 0.13 mm for consistent stack-up accuracy

Compatibility

Designed for use in electronic assemblies requiring M3 x 0.5 metric female standoffs, including circuit board mounting applications where a 21 mm standoff height is specified.

Installation Notes

Install and remove using a hex wrench or nut driver sized for 4.5 mm across flats to avoid rounding the hex body. Always power down and discharge capacitors in the assembly before servicing circuit boards or replacing standoffs. Do not overtighten mating screws into the female threads, as brass is softer than steel and susceptible to thread damage under excessive torque. Inspect threads for debris or damage before assembly to ensure full thread engagement.