Electro Hardware MMF1319M0321M25 Hex Standoff M2.5

Product Description

The ELECTRO HARDWARE MMF1319M0321M25 is a male-female hex circuit board standoff designed to mount and space printed circuit boards at a fixed distance from a chassis or secondary board. Machined from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff provides corrosion resistance and reliable conductivity in electronic assemblies. The M2.5 x 0.45 metric thread runs male on one end and female (tapped) on the other, allowing boards to be stacked or secured in a single fastening operation. Overall length is 16.97 mm, with a hex body width across flats of 4.5 mm for clean wrench engagement.

This standoff is used in electronic control board assemblies found across HVAC control panels, plumbing system controllers, electrical enclosures, and industrial equipment. Technicians and assemblers use it wherever metric M2.5 thread spacing is required and a hex body profile is needed for torque control during installation. The zinc-plated brass construction makes it suitable for indoor enclosures and light-duty environmental exposures.

Key Features

• Male-female hex body design allows stacking or board-to-chassis mounting in one fastener
• M2.5 x 0.45 metric thread on both ends for compatibility with standard metric hardware
• Brass base material with zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22
• 4.5 mm width across flats allows positive hex wrench or nut driver engagement
• Overall length of 16.97 mm with a 13.00 mm hex body and 3.97 mm male thread length
• Length tolerance held to -0.150 to 0.150 mm for consistent board spacing

Compatibility

Designed as a metric M2.5 x 0.45 male-female hex standoff for use in circuit board mounting applications requiring a 4.5 mm hex body profile and ASTM B633 Type 1 zinc-plated brass construction.

Installation Notes

Installation is performed by electronics technicians and control board assemblers. Power down and de-energize all circuits before handling or mounting circuit boards. Use an appropriately sized hex driver or nut driver matched to the 4.5 mm across-flats dimension to avoid deforming the hex body. Do not overtighten - brass standoffs can be damaged by excessive torque, which may strip the M2.5 thread or crack the board mounting hole.