Electro Hardware MMF1331M09F16M3 Hex Standoff M3x0.5

Product Description

The ELECTRO HARDWARE MMF1331M09F16M3 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs, mounting plates, and enclosure surfaces. Machined from grade 303 stainless steel with a bright uncoated finish, it meets the QQ-S-763 fastener standard. The standoff features an M3x0.5 thread on both the male and female ends, with an overall length of 24.76 mm (approximately 0.975 inches) and a 4.5 mm hex body that accepts a standard nut driver or hex wrench. Electronics assemblers, panel builders, and industrial maintenance technicians use this hardware in control panels, PCB stacking assemblies, and enclosure builds.

This standoff is suited for applications requiring a corrosion-resistant, metric-threaded spacer in electronic assemblies, control boards, and instrumentation panels. The hexagonal body allows tool-driven installation and removal without slippage, making it practical in tight board-level work. Typical use cases include HVAC control board assemblies, electrical panel sub-plate mounting, and any stackable PCB configuration calling for a rigid, reusable stainless steel spacer in a metric M3 thread pattern.

Key Features

• Male-female hex configuration allows stacking between two circuit boards or a board and a mounting surface
• Grade 303 stainless steel construction meets QQ-S-763 for corrosion resistance and dimensional consistency
• 4.5 mm hex body width accepts standard nut drivers for controlled torque installation
• M3x0.5 thread on both ends for compatibility with common metric fastener systems
• Bright uncoated finish - no coating thickness to account for in tight-tolerance assemblies
• Length tolerance of -0.150 mm to +0.150 mm for consistent board standoff height

Compatibility

Designed as a metric M3x0.5 male-female hex standoff for use in PCB stacking, control board mounting, and panel fabrication applications requiring a 24.76 mm overall length stainless steel spacer.

Installation Notes

Installation is performed by electronics assemblers or panel technicians. Power down and de-energize all boards and enclosures before installing or removing standoffs. A nut driver or hex wrench sized to the 4.5 mm flats should be used to seat the male thread end into the mounting surface before stacking the mating board onto the female thread. Do not over-torque the M3 threads into plastic standoff bosses or PCB mounting holes, as stainless steel threads can damage softer substrate materials.