Electro Hardware P357M03F21256 Hex Standoff 2-56

Product Description

The ELECTRO HARDWARE P357M03F21256 is a female hex circuit board standoff designed to create a fixed, threaded spacer between a PCB and a mounting surface or between stacked boards. It accepts a 2-56 machine screw on both ends, providing a secure female thread connection. The overall length is 1.25 inches, and the hex body measures 3/16 inches across the flats, allowing standard hex tooling to drive or hold the standoff during installation. The body is machined from brass and finished with a zinc plating that meets ASTM B633 Type 1 and QQ-B-626 Comp 22 specifications for corrosion resistance. This standoff suits electronics assembly and control board mounting work across HVAC, electrical, and industrial panel applications.

This standoff is a standard inch-series fastener used wherever a rigid, electrically isolated or grounded spacing post is needed on a circuit board assembly. Common applications include mounting control boards inside HVAC air handlers and furnace cabinets, securing relay boards within electrical enclosures, and building custom panel assemblies. The 2-56 thread size and 1-1/4 inch body length are frequently encountered in residential and light commercial control board configurations. Installation does not require specialized tooling beyond a standard hex wrench or nut driver sized for 3/16 inch across flats.

Key Features

• Female 2-56 thread accepts standard 2-56 machine screws for secure board-to-board or board-to-chassis mounting
• 1.25 inch overall length provides precise standoff height between mating surfaces
• Hexagonal body at 3/16 inches across flats allows hex wrench or nut driver installation
• 3/16 inch thread depth on each end ensures adequate thread engagement for 2-56 fasteners
• Brass construction with zinc plating meets ASTM B633 Type 1 and QQ-B-626 Comp 22 corrosion resistance standards

Compatibility

Designed as an OEM-style replacement or general-use standoff for circuit board assemblies requiring a 2-56 inch-series female hex standoff with a 1-1/4 inch overall length.

Installation Notes

Installation is typically performed by electronics assembly technicians or electricians working on control panel builds. Always de-energize and lock out the equipment before servicing any circuit board or control assembly. Use a properly sized nut driver or hex wrench matching the 3/16 inch across-flats dimension to avoid rounding the hex body. Do not overtighten — apply only enough torque to seat the standoff firmly against the board surface without cracking the PCB substrate.