Electro Hardware MP409M03F21M3 Female Hex Standoff M3

Product Description

The ELECTRO HARDWARE MP409M03F21M3 is a female hex circuit board standoff designed to create precise spacing between PCBs and mounting surfaces in electronic assemblies. Machined from brass with a clear zinc chromate finish per ASTM B633 Type 1 and QQ-B-626 Comp 22, this standoff provides a fully threaded M3 x 0.5 female thread with a 5 mm thread depth across its full 5 mm overall length. The hexagonal body measures 4.5 mm across flats, allowing standard hex tooling for installation and removal. Electronics assembly technicians, field service techs, and panel builders working on control boards, HVAC circuit boards, and industrial enclosures rely on this type of hardware for repeatable, secure PCB mounting.

This standoff is suited for metric-threaded PCB mounting applications in residential and commercial electronics, including HVAC control boards, electrical panel subassemblies, and industrial automation equipment. The M3 x 0.5 thread size and 5 mm overall length make it appropriate for low-profile board stacking and chassis mounting where precise standoff height and a clean hex drive profile are required. The brass base material offers good corrosion resistance, and the zinc plating adds a secondary layer of protection in environments subject to moisture or vibration.

Key Features

• Fully threaded female M3 x 0.5 thread with 5 mm thread depth - accepts full thread engagement over the entire body length
• Hexagonal body at 4.5 mm across flats for use with standard hex drivers and wrenches
• Brass construction with clear zinc chromate finish meets ASTM B633 Type 1 and QQ-B-626 Comp 22
• 5 mm overall length with a tight length tolerance of -0.13 to 0.13 mm for consistent board spacing
• Metric measurement system - directly compatible with M3-threaded PCB hardware and mounting screws

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit boards and electronic assemblies using M3 x 0.5 metric threaded fasteners.

Installation Notes

Installation is performed by electronics technicians and electricians working on control boards, enclosures, or panel assemblies. Always power down and de-energize the board or assembly before installing or removing standoffs. Use a hex driver or appropriately sized wrench on the 4.5 mm flats to avoid deforming the body. Do not over-torque - brass standoffs are susceptible to thread stripping if excessive force is applied.