Electro Hardware MMF1339M09F16M3 Hex Standoff M3

Product Description

The ELECTRO HARDWARE MMF1339M09F16M3 is a male-female hex circuit board standoff designed for securing PCBs and mounting hardware in electronic assemblies. Machined from grade 303 stainless steel with a bright, uncoated finish, this standoff meets the QQ-S-763 federal specification for stainless steel fasteners. The M3 x 0.5 thread size runs on both the male and female ends, with an overall length of 28.76 mm (approximately 1.13 inches) and a hex body width across flats of 4.50 mm (approximately 0.18 inches). It is installed by electronics assembly technicians, field service engineers, and trade professionals working on control boards in HVAC, electrical, and industrial equipment.

This standoff is suited for residential and commercial electronics assemblies where PCBs require a fixed, rigid offset from a mounting surface or chassis. The male-female configuration allows standoffs to be stacked or used in multilayer board assemblies. The hex body profile allows installation and tightening with standard hex drivers or wrenches, making it practical for production and field service environments. Its stainless steel construction makes it appropriate for applications where corrosion resistance is a factor.

Key Features

• M3 x 0.5 metric thread on both male and female ends for versatile stacking and mounting
• Grade 303 stainless steel construction conforming to QQ-S-763 specification
• Bright, uncoated finish suitable for standard and corrosion-resistant applications
• Hex body profile with 4.50 mm width across flats for wrench or driver installation
• Body length of 24.00 mm with a length tolerance of -0.150 to 0.150 mm for precise board spacing
• Thread depth of 6.40 mm on the female end with a 4.76 mm male thread length

Compatibility

Designed for use with M3 x 0.5 threaded fasteners and PCB mounting hardware in metric-standard electronic assemblies and control board applications.

Installation Notes

Installation should be performed by qualified electronics or electrical technicians familiar with PCB mounting practices. De-energize all circuits and discharge any capacitors before handling control boards or standoffs in live equipment. Use an appropriately sized hex driver or wrench on the hex body flats to avoid rounding the standoff during tightening. Do not overtighten, as excessive torque can crack PCB substrates or damage threaded inserts.