Electro Hardware MMF1331M0916M25 Hex Standoff M2.5

Product Description

The ELECTRO HARDWARE MMF1331M0916M25 is a male-female hex circuit board standoff designed to create precise spacing between PCBs and mounting surfaces in electronic assemblies. Machined from 303 stainless steel with a bright, uncoated finish, this standoff meets the QQ-S-763 federal specification for stainless steel fasteners. The M2.5 x 0.45 thread size covers both the male and female ends, with an overall length of 23.97 mm and a hex body width across flats of 4.50 mm. It is installed by electronics assembly technicians, panel builders, and field service engineers working on control boards and instrumentation enclosures.

This standoff is used in metric fastener applications where a male thread on one end and a female threaded bore on the other end are required to stack or separate printed circuit boards within an enclosure. Typical install scenarios include industrial control panels, HVAC control board assemblies, and instrumentation chassis where consistent board-to-board or board-to-chassis spacing is critical. The hex body allows installation and removal with standard hex drivers or wrenches without marring surrounding surfaces.

Key Features

• Male-female configuration allows stacking of multiple standoffs or direct board mounting in a single assembly
• 303 stainless steel construction resists corrosion in humid or mildly aggressive environments
• Meets QQ-S-763 federal specification for stainless steel fasteners
• Hex body shape (4.50 mm width across flats) accepts standard metric hex drivers for controlled installation torque
• Length tolerance of -0.150 mm to +0.150 mm ensures consistent board spacing across production runs
• Bright uncoated finish maintains dimensional accuracy without added coating thickness

Compatibility

Designed as a metric M2.5 x 0.45 male-female hex standoff for use in PCB assemblies, control boards, and instrumentation enclosures requiring QQ-S-763 compliant stainless steel hardware.

Installation Notes

Installation is typically performed by electronics assembly technicians or licensed electricians during control panel builds or board-level service. Power down and de-energize all circuits before servicing any control board assembly. Use a properly sized metric hex driver or wrench sized to the 4.50 mm flats to avoid rounding the hex body. Do not over-torque; follow the PCB or enclosure manufacturer guidelines for fastener seating on M2.5 threaded hardware.