Electro Hardware MMF1333M0321M25 Hex Standoff M2.5

Product Description

The ELECTRO HARDWARE MMF1333M0321M25 is a male-female hex circuit board standoff designed to create precise spacing between PCBs, mounting panels, and enclosures in electronic assemblies. The standoff features an M2.5 x 0.45 threaded male end and a female threaded bore, allowing boards to be stacked or secured with a mating screw. Constructed from brass with a zinc-plated finish that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, it delivers reliable corrosion resistance and dimensional stability. Overall length is 24.97 mm (approximately 0.983 inches), with a hex body width across flats of 4.50 mm (approximately 0.177 inches). Electronic assemblers, field service technicians, and PCB rework specialists are the typical installers.

This standoff is used in residential and commercial electronic control assemblies, instrumentation enclosures, industrial control panels, and HVAC or other trade-equipment circuit board assemblies. The male-female configuration allows daisy-chaining multiple standoffs for adjustable board spacing or single-layer mounting where a screw passes through to the female end. The hex body profile accepts a standard hex driver or wrench for torque-controlled installation without slipping. Its metric M2.5 x 0.45 thread pitch is common in compact PCB mounting applications where space is limited.

Key Features

• Male-female hex configuration supports stacked PCB assemblies and single-board panel mounting
• M2.5 x 0.45 metric thread on both male and female ends for consistent engagement
• Brass construction with zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22
• Overall length of 24.97 mm with a length tolerance of -0.150 to 0.150 mm for precision fitment
• 4.50 mm hex body width across flats accepts standard metric hex tooling
• Thread depth of 4.80 mm and thread length of 3.97 mm for secure fastener engagement

Compatibility

Designed as a standard M2.5 x 0.45 metric male-female hex standoff suitable for circuit board mounting applications requiring brass construction with a zinc-plated finish.

Installation Notes

Electronic assemblers and PCB technicians typically install these standoffs using a hex driver or wrench sized to the 4.50 mm flats. Power down and de-energize all boards and enclosures before installing or removing standoffs. Avoid over-torquing brass hardware, as the material is softer than steel and threads can strip under excessive force. Follow applicable IPC assembly standards and enclosure manufacturer guidelines for proper standoff spacing and torque procedures.