Electro Hardware MMF1321M0916M25 Hex Standoff M2.5

Product Description

The ELECTRO HARDWARE MMF1321M0916M25 is a male-female hex circuit board standoff designed to mount and space printed circuit boards within electronic assemblies and enclosures. The standoff features a M2.5 x 0.45 thread on both the male and female ends, allowing boards to be stacked or secured to a chassis at a fixed, repeatable distance. The hex body measures 4.5 mm across flats for easy installation with standard hex drivers. Manufactured from grade 303 stainless steel with a bright uncoated finish, this fastener meets QQ-S-763 material standards. The overall length is 18.97 mm with a body length of 15.00 mm. Licensed electricians, electronics technicians, and OEM assembly technicians are the typical installers.

This standoff is suited for use in control board assemblies, industrial electronics enclosures, HVAC control modules, and other applications where metric M2.5 threaded mounting hardware is required. The male-female configuration allows multiple standoffs to be threaded together for stacked board arrangements or used individually to mount a single PCB to a panel or chassis. Applications span both commercial and residential equipment manufacturing and service environments.

Key Features

• M2.5 x 0.45 metric thread on both male and female ends for stacked or single-board mounting
• Grade 303 stainless steel construction meeting QQ-S-763 standard
• Hex body at 4.5 mm across flats for wrench or hex driver installation
• Bright uncoated finish — no coating to flake or interfere with electrical grounding paths
• Overall length of 18.97 mm with a body length of 15.00 mm and thread depth of 4.80 mm
• Length tolerance of -0.150 to 0.150 mm for consistent board spacing

Compatibility

Designed as an OEM-style metric standoff for circuit board assemblies requiring M2.5 x 0.45 threaded male-female hex fasteners.

Installation Notes

Power down and de-energize all equipment before installing or removing circuit board standoffs. Use a hex driver or small open-end wrench sized to the 4.5 mm flats — avoid over-torquing, which can strip the M2.5 thread or crack the PCB mounting hole. When stacking boards, confirm that the combined standoff length provides adequate clearance for all components between boards. Follow applicable IPC assembly guidelines and equipment manufacturer torque recommendations where specified.