Electro Hardware 1321M03F21256 Hex Standoff 2-56

Product Description

The ELECTRO HARDWARE 1321M03F21256 is a male-female hex circuit board standoff designed to create measured spacing between printed circuit boards or between a 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 provides corrosion resistance and reliable electrical isolation in tight assemblies. The hex body shape allows wrench engagement for secure installation without slippage. With a 2-56 thread size, 0.75 inch overall body length, and 0.1875 inch width across flats, it fits compact PCB stacking applications common in HVAC control boards, electrical enclosures, and instrumentation panels.

This standoff is suited for use in residential and light commercial electronic assemblies where precise board-to-board or board-to-chassis spacing is required. Typical applications include mounting control boards inside HVAC units, securing relay panels, and stacking PCBs within electrical enclosures. The male thread on one end engages a mounting hole or female standoff below, while the female thread on the opposite end accepts a screw or the male end of an adjacent standoff. Electronics technicians, HVAC controls specialists, and panel builders routinely use this type of fastener during control board installation or replacement work.

Key Features

• Brass construction with zinc-plated finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 fastener standards
• Hex body shape allows wrench engagement for secure torque-down
• 2-56 thread size with 5/32 inch thread length on the male end
• 3/16 inch thread depth on the female end
• 0.75 inch overall body length with tight length tolerance of -0.005 to 0.005 inch

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit board assemblies using 2-56 inch-series threaded fasteners with a 3/16 inch hex body profile.

Installation Notes

Installation is performed by electronics technicians or HVAC controls specialists using a small hex wrench or nut driver sized for the 3/16 inch flats. Always de-energize and discharge the equipment before handling any circuit board or internal fasteners. Avoid over-tightening, as brass threads can strip if excessive force is applied. Follow applicable NEC guidelines and equipment manufacturer service procedures when replacing or mounting control boards.