Electro Hardware MMF1823M03F21M4 Hex Board Standoff M4

Product Description

The ELECTRO HARDWARE MMF1823M03F21M4 is a male-female hex circuit board standoff designed to create precise, rigid spacing between stacked PCBs or between a circuit board and a mounting surface. The standoff features an M4 x 0.7 thread on both the male and female ends, with an overall length of 25.53 mm (approximately 1.005 inches) and a hex body width across flats of 6.00 mm. Constructed from brass with a zinc plating finish, it meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. Electronics assemblers, panel builders, and electrical enclosure technicians install these standoffs during board mounting operations where secure, repeatable stack height is required.

This standoff is suited for metric-threaded PCB assemblies in industrial control panels, HVAC control boards, electrical enclosures, and commercial electronics installations. The M4 x 0.7 thread size is a common metric fastener standard used in a wide range of board-level mounting applications. The hex body shape allows for wrench engagement, making it practical in both benchtop assembly and in-field service situations where torque control during installation is needed.

Key Features

• M4 x 0.7 male and female threads for secure, stackable PCB mounting
• Hex body shape with 6.00 mm width across flats for wrench engagement
• Brass construction with zinc plating for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Overall length of 25.53 mm with a body length of 16.00 mm and thread depth of 11.10 mm
• Length tolerance of -0.150 to 0.150 mm for precise stack height control

Compatibility

Designed as a standard metric M4 x 0.7 male-female hex standoff suitable for circuit board mounting applications requiring brass construction and zinc plating in compliance with ASTM B633 Type 1 and QQ-B-626 Comp 22 specifications.

Installation Notes

Installation is typically performed by electronics assemblers or electricians during board mounting or panel assembly. Power down and de-energize any associated equipment before installing or replacing standoffs on live control boards. Use an appropriately sized hex wrench or nut driver sized for 6.00 mm across flats to avoid deforming the hex body. Do not over-tighten; brass threads can be damaged by excessive torque.