Electro Hardware MMF1305M03F21M3 Hex Standoff M3x0.5

Product Description

The ELECTRO HARDWARE MMF1305M03F21M3 is a male-female hex circuit board standoff designed to space and secure printed circuit boards within enclosures and electronic assemblies. The male end threads into a mounting surface or lower board while the female end accepts the fastener from the upper board, creating a rigid, defined standoff distance. Machined from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff provides corrosion resistance and reliable electrical grounding continuity. The M3x0.5 metric thread and 4.5 mm hex body make it compatible with standard M3 hardware and common hex drivers used in PCB assembly work.

This standoff is suited for use in residential and commercial electronic control boards, HVAC control modules, low-voltage electrical panels, and industrial enclosures where PCB-to-surface or PCB-to-PCB spacing is required. It is commonly installed during PCB assembly, control board replacement, or enclosure builds by electronics technicians, HVAC controls specialists, and electrical panel assemblers. The hex body shape allows precise torque application with standard hex drivers or nut drivers without risk of slipping or damaging nearby board traces.

Key Features

• Male-female configuration supports board-to-surface or board-to-board stacking
• M3x0.5 metric thread on both male pin and female receptacle end
• Brass construction with zinc plating meets ASTM B633 Type 1 and QQ-B-626 Comp 22
• Hex body profile at 4.5 mm across flats allows tool-driven installation without slippage
• Overall length of 11.76 mm with a 7.00 mm hex body and 4.76 mm male thread length
• Length tolerance held to -0.150 to 0.150 mm for consistent PCB standoff height

Compatibility

Designed as a standard M3x0.5 metric hex standoff for use in circuit board mounting applications requiring brass construction and zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22 specifications.

Installation Notes

Installation is typically performed by electronics technicians or controls specialists using a hex driver or nut driver sized for 4.5 mm across flats. Power down and de-energize all circuits before installing or removing standoffs from active control boards. Avoid over-torquing, as brass threads can strip or crack the PCB mounting hole under excessive force. Minimum order quantity is 10 units.