Electro Hardware MMF1835M03F21M4 Hex Board Standoff M4

Product Description

The ELECTRO HARDWARE MMF1835M03F21M4 is a male-female hex circuit board standoff designed to create precise, fixed spacing between printed circuit boards or between a board and a chassis. Machined from brass with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff delivers reliable conductivity and corrosion resistance in tight electronic assemblies. The M4 x 0.7 thread runs on both the male pin end and the female threaded bore. Overall length is 31.53 mm with a hex body width across flats of 6 mm, making it compatible with standard hex drivers and wrenches.

This standoff is used in PCB stacking applications across industrial controls, HVAC control boards, electrical panels, and automation equipment. The male end threads into a female standoff or mounting plate while the female end accepts the next board-level fastener, allowing multiple boards to be stacked in a secure column. Installers in electronics assembly, field service, and OEM repair work use this style of standoff when original hardware must be matched exactly for thread size and stack height. The 6 mm hex body allows torque application without slipping.

Key Features

• Male-female hex configuration supports PCB stacking and board-to-chassis mounting
• M4 x 0.7 thread on both ends for consistent metric fastener compatibility
• Brass construction with zinc plating meets ASTM B633 Type 1 and QQ-B-626 Comp 22
• Overall length of 31.53 mm with a length tolerance of -0.150 to 0.150 mm for precise stack height
• 6 mm width across flats accepts standard hex tooling
• Thread depth of 11.10 mm on the female end with a thread length of 9.53 mm on the male end

Compatibility

Designed as an OEM-style replacement or direct-fit standoff for metric PCB assemblies requiring M4 x 0.7 male-female hex hardware with a 31.53 mm overall length and 6 mm hex body.

Installation Notes

Installation is typically performed by electronics technicians or field service engineers during board assembly or repair. De-energize all equipment completely before removing or installing circuit board hardware. Use a calibrated hex driver or nut driver sized for 6 mm across flats to avoid rounding the hex body. Follow IPC assembly guidelines and any applicable equipment manufacturer torque recommendations when stacking multiple boards.