Electro Hardware MMF1325M03F21M3 Hex Standoff M3

Product Description

The ELECTRO HARDWARE MMF1325M03F21M3 is a male-female hex circuit board standoff designed to create precise, repeatable spacing between PCBs and mounting surfaces or between stacked boards. The standoff features an M3 x 0.5 threaded male end and a matching female threaded bore, allowing boards to be fastened and stacked in a single mounting point. Constructed from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff provides corrosion resistance suitable for electronics enclosures and control panel assemblies. Technicians and assemblers working on control boards, HVAC control modules, and similar equipment rely on standoffs like this to maintain board clearance and mechanical stability.

This standoff is suited for metric-threaded circuit board assemblies in residential and commercial control panels, HVAC equipment electronics, electrical enclosures, and industrial equipment. The hex body profile allows installation and removal with standard hex drivers or wrenches, making it practical in tight board-level service scenarios. The M3 x 0.5 thread pitch is a common metric standard found across a wide range of PCB mounting applications.

Key Features

• M3 x 0.5 male and female threads for metric PCB stacking and mounting
• Overall length of 21.76 mm (approximately 0.857 inches) with a body length of 17.00 mm
• 4.50 mm (approximately 0.177 inches) hex width across flats for wrench-driven installation
• Brass construction with zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22
• Thread depth of 6.40 mm on the female end; thread length of 4.76 mm on the male end
• Length tolerance of -0.150 to 0.150 mm for consistent board spacing

Compatibility

Designed as an OEM-style metric standoff for use in M3-threaded circuit board mounting and stacking applications across electronics assemblies and control panel installations.

Installation Notes

Installation is typically performed by electronics technicians or control board assemblers. Power down and de-energize all circuits before working on any PCB assembly. Use an appropriately sized hex driver or nut driver matched to the 4.50 mm across-flats dimension to avoid rounding the hex body. Follow the equipment manufacturer's torque guidelines for PCB hardware to prevent board stress or cracking.