Electro Hardware MMF1327M03F21M3 Hex Standoff M3

Product Description

The ELECTRO HARDWARE MMF1327M03F21M3 is a male-female hex circuit board standoff designed to create precise, repeatable spacing between PCBs and mounting surfaces in electronic assemblies. Machined from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff provides reliable conductivity and corrosion resistance in panel-mount and rack-mount applications. The M3 x 0.5 thread accepts standard metric fasteners on both ends. Overall length is 22.76 mm with a hex body width across flats of 4.50 mm, allowing installation and tightening with standard metric nut drivers or hex wrenches. Electronics technicians and PCB assembly professionals install this hardware during board-level assembly and system integration work.

This standoff is suited for use in control panels, industrial enclosures, HVAC control boards, electronic instrument assemblies, and similar applications requiring rigid, electrically conductive board-to-board or board-to-chassis spacing. The male-female configuration allows standoffs to be stacked or used as a single-tier spacer between a mounting base and a circuit board. The hex body shape simplifies torquing without slippage during installation. The metric M3 x 0.5 thread sizing is common in compact PCB assemblies found in commercial and light industrial electronics.

Key Features

• M3 x 0.5 metric thread on both male and female ends for standard metric fastener compatibility
• Brass construction with zinc plating meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Hex body shape with 4.50 mm width across flats for wrench or nut driver installation
• Overall length of 22.76 mm with a body length of 18.00 mm and thread depth of 6.40 mm
• Length tolerance of -0.150 to 0.150 mm for consistent stack-up accuracy in multi-board assemblies
• Thread length of 4.76 mm on the male end for reliable engagement with mating fasteners

Compatibility

Designed as a metric M3 x 0.5 male-female hex standoff for use in PCB mounting and circuit board assembly applications requiring brass hardware with zinc-plated finish.

Installation Notes

Installation is performed by electronics technicians or PCB assembly personnel using a metric nut driver or hex wrench sized to the 4.50 mm width across flats. Power down and de-energize all equipment before servicing or replacing board-mounted hardware. Thread engagement should be confirmed on both the male and female ends before final tightening. Avoid over-tightening, which can crack PCB mounting holes or strip the threaded insert.