Electro Hardware MP409M03F21M2.5 Female Hex Standoff M2.5

Product Description

The ELECTRO HARDWARE MP409M03F21M2.5 is a female hex circuit board standoff designed to provide threaded mounting points between PCBs and chassis 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 delivers corrosion resistance and reliable thread engagement in compact spaces. The M2.5 x 0.45 metric thread runs the full 5 mm body length, giving maximum thread engagement for the overall length. At 4.5 mm width across flats, it accepts a standard hex driver or wrench for secure, torque-controlled installation without damage to the board.

This standoff is used in PCB stacking and panel-mount applications across industrial controls, HVAC control boards, electrical enclosures, and similar electronic assemblies requiring a precise metric standoff. The fully threaded female bore accepts an M2.5 fastener from both ends, making it suitable for through-stack configurations or single-sided mounting scenarios. Technicians working on control board replacements and electronic panel assemblies in commercial and residential equipment will find this a direct metric-spec solution where imperial standoffs are not appropriate.

Key Features

• Fully threaded female bore - M2.5 x 0.45 metric thread, 5 mm thread depth for full engagement
• Hex body shape with 4.5 mm width across flats for wrench or hex driver installation
• Brass construction with clear zinc chromate finish per ASTM B633 Type 1 and QQ-B-626 Comp 22
• 5 mm overall length suits tight board-to-board or board-to-chassis spacing requirements
• Length tolerance of -0.13 to 0.13 mm for consistent stack height across multiple standoffs

Compatibility

Designed as a metric M2.5 x 0.45 female hex standoff for PCB mounting applications requiring a 5 mm overall length brass standoff with zinc finish.

Installation Notes

Installation is typically performed by electronics technicians or field service technicians working on control boards and electrical enclosures. De-energize all circuits before handling or replacing standoffs on live boards. Use a correctly sized hex wrench or nut driver matched to the 4.5 mm across-flats dimension to avoid rounding the hex. Do not over-torque into PCB mounting holes, as brass threads can be damaged by excessive force.