Electro Hardware MMF1331M0321M25 Hex Standoff M2.5

Product Description

The ELECTRO HARDWARE MMF1331M0321M25 is a male-female hex circuit board standoff designed to create precise, rigid spacing between stacked PCBs or between a circuit board and a mounting surface. Manufactured from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff delivers reliable electrical isolation and mechanical support in control panels, enclosures, and electronic assemblies. The M2.5 x 0.45 metric thread runs on both the male pin end and the female threaded bore, allowing boards to be fastened and stacked in a single, compact hardware piece. Overall length is 23.97 mm with a 20.00 mm hex body and a 4.50 mm width across flats.

This standoff is suited for use in HVAC control boards, relay panels, variable frequency drive enclosures, and other industrial or commercial electronic assemblies that require metric M2.5 hardware. It is commonly installed during board-level assembly or field repair of control systems where consistent board-to-board or board-to-chassis spacing is critical. The hex body shape allows installation and removal with standard hex drivers or nut drivers without marring the finish. Minimum order quantity is 10 pieces; package quantity is 1.

Key Features

• M2.5 x 0.45 metric thread on both male and female ends for stacking compatibility
• Brass construction with zinc-plated finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Hex body profile at 4.50 mm across flats allows tool-driven installation
• Tight length tolerance of -0.150 to 0.150 mm for precise board spacing
• Overall length 23.97 mm with 3.97 mm thread length and 4.80 mm thread depth

Compatibility

Designed as an OEM-style metric standoff for circuit board assemblies requiring M2.5 x 0.45 male-female hex hardware in residential and commercial electronic control applications.

Installation Notes

Installation is performed by electronics technicians or field service engineers during board assembly or control panel service. De-energize and lockout-tagout all power to the assembly before removing or installing standoffs. Use a correctly sized hex driver or nut driver matching the 4.50 mm across-flats dimension to avoid rounding the hex body. Do not overtighten; brass hardware is subject to thread stripping if torque is excessive.