Electro Hardware MMF1331M03F21M3 Hex Standoff M3x0.5

Product Description

The ELECTRO HARDWARE MMF1331M03F21M3 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs, mounting panels, and enclosure surfaces. Constructed from brass with a zinc-plated finish, this standoff meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. The M3 x 0.5 thread runs on both the male pin end and the female threaded bore, allowing boards or panels to stack securely. With a hex body shape and 4.5 mm width across flats, it accepts standard hex drivers for installation. Electronics assembly technicians and field service techs installing control boards, relay panels, and enclosure hardware are the primary installers of this hardware.

This standoff is suited for use in electronic control assemblies, HVAC control board mounting, low-voltage panel wiring enclosures, and general PCB stacking applications. It is appropriate wherever a metric M3 x 0.5 threaded standoff is required to maintain consistent board-to-board or board-to-chassis clearance. The 24.76 mm overall length and 20.00 mm hex body length make it well suited for medium-depth spacing in compact control enclosures common in residential and light commercial HVAC equipment and electrical panels.

Key Features

• Male-female hex body provides threaded connection on both ends for stackable PCB mounting
• M3 x 0.5 thread size on both male pin and female bore ends
• Brass construction with zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22
• 4.5 mm width across flats accepts standard metric hex drivers
• 24.76 mm overall length with 20.00 mm hex body length for consistent standoff spacing
• Length tolerance of -0.150 to 0.150 mm for precision fitment

Compatibility

Designed as a standard metric M3 x 0.5 male-female hex standoff for use in PCB mounting and circuit board stacking applications requiring brass construction with a zinc-plated finish.

Installation Notes

Installation is performed by electronics assembly technicians or qualified service personnel. Always de-energize and discharge any board or assembly before installing or removing standoffs to prevent damage to sensitive components. Use a metric hex driver or wrench sized for 4.5 mm across flats to avoid rounding the hex body. Do not over-torque; tighten to the assembly specification for M3 fasteners in brass to avoid thread damage.