Electro Hardware MP405M03F21M3 Hex Standoff M3x0.5

Product Description

The ELECTRO HARDWARE MP405M03F21M3 is a female hex circuit board standoff designed to create fixed spacing between PCBs and mounting surfaces in electronic assemblies. Threaded M3 x 0.5, fully threaded with a 3 mm thread depth, this standoff accepts a mating male fastener on both the chassis side and the board side. The hex body measures 4.5 mm across flats for wrench engagement, and the overall length is 3 mm. Constructed from brass with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22, it provides corrosion resistance suitable for control board and electronics enclosure applications. Electronics assemblers, HVAC technicians, and electrical panel builders install this type of hardware during board mounting and chassis assembly.

This standoff is used in residential and light commercial electronic assemblies where metric M3 fasteners are specified. Typical applications include mounting control boards, relay boards, and logic PCBs to metal or plastic chassis in HVAC units, electrical enclosures, and industrial equipment. The compact 3 mm overall length suits installations where minimal board standoff height is required and panel space is tight.

Key Features

• Female hex body accepts M3 x 0.5 male fasteners on both ends for secure PCB mounting
• Fully threaded through the full 3 mm body length with 3 mm thread depth
• Hex profile across 4.5 mm flats allows standard wrench or nut driver installation
• Brass construction with clear zinc chromate finish meets ASTM B633 Type 1 and QQ-B-626 Comp 22
• Metric M3 x 0.5 thread system for compatibility with metric-fastened PCB assemblies

Compatibility

Designed as an OEM-style metric standoff for circuit board mounting applications requiring M3 x 0.5 female threaded hex standoffs with a 3 mm overall length.

Installation Notes

Install and remove using a wrench or nut driver sized for 4.5 mm across flats. Power down and de-energize all equipment before removing or installing circuit boards or mounting hardware. Follow applicable electrical codes and manufacturer board-mounting guidelines when torquing fasteners into PCB mounting holes to avoid cracking board substrate. Minimum order quantity for this part is 10 units.