Electro Hardware MMF1301M03F21M3 Hex Standoff M3

Product Description

The ELECTRO HARDWARE MMF1301M03F21M3 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs and mounting surfaces in electronic assemblies. The standoff features M3 x 0.5 threaded connections on both ends - a male thread on one side and a female thread on the other - allowing boards to be stacked or secured at a defined height. Constructed from brass with a zinc-plated finish, it meets ASTM B633 Type 1 and QQ-B-626 Comp 22 specifications. The hex body measures 4.5 mm across flats for wrench engagement. Overall length is 9.76 mm, with a body length of 5.00 mm. Installed by electronics technicians, PCB assembly technicians, and field service engineers working on control boards in HVAC, electrical, and industrial equipment.

This standoff is suited for use in residential and commercial electronic control panel assemblies, PCB stacking applications, and equipment requiring precise board-to-board or board-to-chassis standoff spacing. The M3 metric thread size and hex body profile make it a standard choice for metric-fastener circuit board builds, including those found in HVAC control modules, VFD panels, and similar low-voltage electronic enclosures. Minimum order quantity is 10 units; package quantity is 1.

Key Features

• Male-female hex configuration allows stacking multiple PCBs at consistent standoff height
• M3 x 0.5 metric thread on both male and female ends for precise engagement
• Brass construction with zinc plating meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards
• 4.5 mm width across flats enables standard metric hex wrench installation
• Overall length of 9.76 mm with a thread depth of 6.40 mm and thread length of 4.76 mm
• Length tolerance of -0.150 mm to 0.150 mm for consistent, repeatable board spacing

Compatibility

Designed as a standard metric M3 x 0.5 male-female hex standoff for use in PCB mounting and circuit board stacking applications where metric fasteners and hex-body standoffs are specified.

Installation Notes

Installation is performed by electronics or electrical technicians. Always de-energize and discharge the board assembly before installing or removing standoffs. Use an appropriately sized metric hex driver or wrench on the 4.5 mm flats to avoid stripping the hex body. Follow applicable assembly drawings and torque guidelines provided by the board or enclosure manufacturer.