Electro Hardware MMF1303M09F16M3 Hex Standoff M3 X 0.5

Product Description

The ELECTRO HARDWARE MMF1303M09F16M3 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs, mounting panels, and enclosure surfaces. Machined from 303 stainless steel with a bright uncoated finish, this standoff meets the QQ-S-763 fastener standard. The M3 x 0.5 thread size runs on both ends - a male thread on one end and a female threaded bore on the other - allowing boards and hardware layers to stack securely without floating or shifting. Overall length is 10.76 mm (0.42 inches), with a hex body that accepts a standard wrench for installation torque control. Licensed electricians, electronics technicians, and control board service professionals install these in panel assemblies and instrumentation enclosures.

This standoff is suited for residential and commercial control panels, instrumentation racks, HVAC control board assemblies, and any application requiring precise PCB-to-surface spacing. The hex body shape allows wrench access in tight board layouts where finger tightening is not practical. The M3 x 0.5 metric thread is a common fastener standard across a wide range of circuit board and enclosure manufacturers, making this a frequently specified component in new builds and service replacements alike.

Key Features

• Male-female thread configuration for stackable PCB mounting
• M3 x 0.5 metric thread on both male and female ends
• 303 stainless steel construction meeting QQ-S-763 standard
• Hex body with 4.50 mm width across flats for wrench installation
• Bright uncoated finish - no coating to crack or delaminate under vibration
• Length tolerance of -0.150 to 0.150 mm for consistent stack height

Compatibility

Designed as a standard M3 x 0.5 male-female hex standoff suitable for circuit board assemblies and panel enclosures that specify metric M3 fastener hardware.

Installation Notes

Install using an appropriately sized hex wrench or nut driver matched to the 4.50 mm across-flats body - do not use pliers, which can mar the hex faces. De-energize all control boards and panels before installing or removing standoffs to avoid ESD damage or shorting live circuits. Follow applicable enclosure and panel assembly guidelines per NEC or equipment manufacturer instructions. Hand-start threads carefully to avoid cross-threading the M3 x 0.5 pitch before applying wrench torque.