Electro Hardware MMF1311M03F21M3 Hex Standoff M3x0.5

Product Description

The ELECTRO HARDWARE MMF1311M03F21M3 is a male-female hex circuit board standoff designed to create precise spacing and secure mechanical attachment between PCBs, chassis panels, and enclosures. Machined from brass with a zinc-plated finish, this metric standoff features an M3x0.5 thread on both the male post and the female threaded bore. The hex body measures 4.5 mm across flats, allowing standard hex tools to seat and torque the fastener without slippage. The overall installed length is 14.76 mm, with a 10.00 mm hex body and a 4.76 mm male thread extension. Installed by electronics assemblers, field service technicians, and trade professionals working on control boards in HVAC, electrical, and industrial equipment.

This standoff is suited for metric circuit board assemblies in both commercial and residential control applications. It is commonly used during PCB mounting in variable frequency drives, control enclosures, relay panels, and equipment where repeatable board-to-board or board-to-chassis spacing is required. The zinc plating provides corrosion resistance appropriate for indoor electrical enclosure environments. The minimum order quantity is 5 pieces; each package contains 1 piece.

Key Features

• Male-female configuration allows stackable or chassis-mount PCB installations in a single fastener
• M3x0.5 thread on both ends for compatibility with standard metric M3 hardware
• Hex body at 4.5 mm across flats accepts standard metric wrenches and hex drivers
• Brass construction with zinc plating meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Overall length of 14.76 mm with a 10.00 mm body length for consistent board spacing
• Length tolerance of -0.150 mm to +0.150 mm for precise mechanical fit

Compatibility

Designed as an OEM-style metric standoff for circuit board assemblies requiring M3x0.5 thread fasteners with a hex drive body in commercial and residential electronic control applications.

Installation Notes

Installation is performed by electronics assemblers or qualified service technicians. De-energize all circuits and discharge any capacitors before handling circuit boards or installing standoffs. Use a properly sized metric hex wrench or nut driver sized for 4.5 mm across flats to avoid rounding the hex body. Do not overtighten - apply only enough torque to seat the standoff firmly against the board surface without cracking the PCB substrate.