Electro Hardware MMF1307M03F21M3 Hex Standoff M3x0.5

Product Description

The ELECTRO HARDWARE MMF1307M03F21M3 is a male-female hex circuit board standoff designed to create controlled spacing between stacked PCBs or between a PCB and a mounting surface. Machined from brass with a zinc-plated finish, this standoff meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. The M3x0.5 thread on both the male pin and female threaded bore provides a secure mechanical connection. Overall length is 12.76 mm (approximately 0.502 inches), with a hex body measuring 4.5 mm (approximately 0.177 inches) across flats. Licensed electronics technicians, PCB assemblers, and electrical panel builders use these standoffs during board mounting and enclosure assembly.

This standoff is suited for metric-fastener PCB assemblies in electronics manufacturing, control panel fabrication, and field-service applications. The male-female configuration allows standoffs to be stacked or chained, making them useful in multi-board assemblies where layer-to-layer spacing must be consistent. The hex body shape enables wrench tightening for secure installation. Typical applications include mounting control boards in HVAC equipment, industrial enclosures, and electronic assemblies where a zinc-plated brass standoff meets corrosion-resistance and conductivity requirements.

Key Features

• Male-female configuration allows stacking across multiple PCB layers
• Brass construction with zinc-plated finish meets ASTM B633 Type 1 and QQ-B-626 Comp 22
• M3x0.5 thread size on both male pin and female bore for consistent metric fastening
• Hex body profile (4.5 mm across flats) allows wrench installation and precise torque control
• Overall length of 12.76 mm with a length tolerance of -0.150 to 0.150 mm for accurate board spacing
• Thread depth of 6.40 mm and thread length of 4.76 mm provide adequate thread engagement

Compatibility

Designed for use in M3x0.5 metric thread applications. Suitable for PCB mounting, enclosure assembly, and control board installations requiring a male-female brass hex standoff with a 4.5 mm hex body.

Installation Notes

Installation is typically performed by electronics technicians or licensed electricians during PCB assembly or panel fabrication. De-energize all equipment and discharge any stored voltage before handling circuit boards or installing standoffs. Use an appropriately sized hex wrench or nut driver on the 4.5 mm hex body to achieve a secure fit without over-stressing the brass threads. Follow applicable IPC assembly standards and equipment manufacturer guidelines when determining final torque and spacing requirements.