Electro Hardware MMF1317M03F21M3 Hex Standoff M3

Product Description

The ELECTRO HARDWARE MMF1317M03F21M3 is a male-female hex circuit board standoff designed to create precise spacing between stacked PCBs or between a circuit board and a mounting surface. The fastener features an M3 x 0.5 thread on both the male and female ends, with an overall length of 16.76 mm (0.66 inches) and a body length of 12.00 mm (0.47 inches). The hexagonal body measures 4.50 mm (0.18 inches) across flats, allowing standard hex tooling for installation. Constructed from brass with a zinc-plated finish, this standoff meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards. It is installed by electronics assembly technicians and field service engineers working on control boards in HVAC, electrical, and industrial equipment.

This standoff is suited for use in control board assemblies found in residential and light commercial HVAC equipment, electrical panels, and industrial enclosures. It provides a mechanically sound, electrically appropriate spacer between layers of a printed circuit board stack or between a board and a chassis. The metric M3 x 0.5 thread pitch makes it compatible with standard metric-threaded PCB mounting hardware. Technicians replacing or servicing control boards in variable-speed drives, thermostat assemblies, or similar electronics will find this standoff applicable where OEM-spec metric fasteners are required. Sold individually; minimum order quantity is 10 units.

Key Features

• Male-female configuration allows stacking of circuit boards at a fixed standoff height
• M3 x 0.5 metric thread on both ends with a thread depth of 6.40 mm and thread length of 4.76 mm
• Hexagonal body with 4.50 mm width across flats accepts standard hex wrench or nut driver
• Brass construction with zinc plating for corrosion resistance per ASTM B633 Type 1 and QQ-B-626 Comp 22
• Length tolerance of -0.150 to 0.150 mm for precise board spacing
• Lightweight at approximately 0.005 pounds per unit

Compatibility

Designed as an OEM-style metric fastener for circuit board assemblies requiring M3 x 0.5 male-female hex standoffs. Compatible with any PCB or chassis mounting point tapped to M3 x 0.5 metric thread specification.

Installation Notes

Installation should be performed by a qualified technician with the associated equipment fully de-energized and locked out before servicing any circuit board assembly. Use a hex wrench or appropriately sized nut driver sized for 4.50 mm across flats to seat the standoff without over-torquing the brass body. Avoid cross-threading during engagement of both the male pin and the female receptacle. Follow applicable IPC assembly standards and equipment manufacturer guidelines when working inside control board enclosures.