Electro Hardware MP445M03F21M3 Female Hex Standoff M3

Product Description

The ELECTRO HARDWARE MP445M03F21M3 is a female hex circuit board standoff designed to create fixed spacing between PCBs, mounting panels, and chassis 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 indoor electronic enclosures. The M3 x 0.5 thread is fully threaded through a 23 mm body, with the hex profile measuring 4.5 mm across flats to accept standard hex drivers and wrenches. Licensed electronics assemblers, field service technicians, and OEM production staff install these fasteners in control boards, drive assemblies, and instrumentation panels.

This standoff is applied wherever a female-threaded hex spacer is needed to secure and elevate a circuit board from a base surface. The M3 metric thread size makes it compatible with standard M3 machine screws commonly used in HVAC control boards, electrical enclosure sub-panels, and light commercial electronic assemblies. The fully threaded 23 mm depth allows a mating screw to engage the full thread engagement without bottoming out, supporting both rigid board mounting and stacked PCB configurations.

Key Features

• M3 x 0.5 fully threaded female interior accepts standard M3 machine screws
• 23 mm overall length with full 23 mm thread depth for maximum thread engagement
• Hexagonal body at 4.5 mm across flats allows installation with standard hex tooling
• Brass construction with clear zinc chromate finish for corrosion resistance
• Compliant with ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Length tolerance held to -0.13 to 0.13 mm for consistent stack height

Compatibility

Designed as an OEM-style metric standoff for circuit board mounting applications requiring M3 x 0.5 female thread engagement in electronic enclosures and control panel assemblies.

Installation Notes

Installation is performed by electronics assemblers or field technicians using a hex driver or wrench sized to the 4.5 mm across-flats dimension. Always de-energize the assembly and discharge any capacitors before working inside electronic enclosures. Avoid over-torquing the brass body, as brass threads can be damaged by excessive force. Follow applicable assembly documentation and IPC standards for PCB mounting hardware.