Electro Hardware MP443M03F21M3 Female Hex Standoff M3x0.5

Product Description

The ELECTRO HARDWARE MP443M03F21M3 is a female hex circuit board standoff designed to create precise, secure spacing between PCBs and mounting surfaces in electronic assemblies. Manufactured from brass with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff features a fully threaded M3 x 0.5 female thread running the full 22 mm body length. The hexagonal body measures 4.5 mm across flats, allowing installation and removal with standard hex drivers or wrenches. Electronics assemblers, field service technicians, and panel builders use this hardware in PCB mounting applications where reliable electrical isolation and repeatable board-to-surface spacing are required.

This standoff is suited for metric PCB assembly work in commercial electronics, control panels, HVAC equipment boards, and industrial enclosures where M3 threaded fasteners are specified. The fully threaded female bore and consistent 22 mm overall length make it appropriate for stacking or single-level board mounting configurations. The brass base material provides corrosion resistance and good electrical conductivity, while the zinc plating adds a secondary layer of protection in moderate-duty environments.

Key Features

• M3 x 0.5 fully threaded female bore with 22 mm thread depth for full-length engagement
• Hexagonal body, 4.5 mm width across flats, compatible with standard metric hex tooling
• Brass construction with clear zinc chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Tight length tolerance of -0.13 to 0.13 mm for consistent board-to-surface spacing
• UNSPSC Code 31161816 for procurement system classification

Compatibility

Designed as an OEM-style replacement or new-installation standoff for metric PCB assemblies specifying M3 x 0.5 female threaded hex standoffs with a 22 mm overall length.

Installation Notes

Installation is performed by electronics technicians or panel assemblers using a standard metric hex driver or open-end wrench sized to 4.5 mm across flats. De-energize all boards and assemblies before installing or removing standoffs to prevent electrostatic discharge damage or short circuits. Do not overtighten brass standoffs against PCB mounting holes, as brass threads can be damaged by excessive torque. Follow applicable IPC assembly standards for PCB hardware installation where required by the job specification.