Electro Hardware P357M12F21440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE P357M12F21440 is a female hex circuit board standoff designed to create precise spacing and threaded mounting points on printed circuit boards and electronic assemblies. The standoff features a 4-40 female thread, an overall length of 1.25 inches, and a hex body width across flats of 0.1875 inches. Constructed from steel with a clear zinc chromate finish applied to ASTM B633 Type 1 and QQ-S-633 standards, it delivers corrosion resistance appropriate for electronics enclosures and panel assemblies. The thread depth measures 0.25 inches. This type of hardware is typically installed by electronics assembly technicians, panel builders, and field service electricians working with control boards and equipment enclosures.

This standoff is used in residential and commercial electronic panel assemblies, control boards, and enclosure mounting applications where a secure, vibration-resistant PCB standoff is required. The female thread accepts a mating machine screw to fasten a board or component at the specified height above the mounting surface. It is well suited for HVAC control board installations, electrical enclosures, and similar panel-build environments where consistent board spacing is critical.

Key Features

• 4-40 female thread for standard PCB fastening applications
• 1.25 inch overall length provides consistent board standoff height
• Hex body with 0.1875 inch width across flats allows wrench-tightening during installation
• Steel construction with clear zinc chromate finish per ASTM B633 Type 1 and QQ-S-633
• 0.25 inch thread depth accommodates standard 4-40 mating screws
• Length tolerance of -0.005 to 0.005 inches for consistent stack-up in tight assemblies

Compatibility

Designed as a standard inch-series female hex standoff for PCB and panel assemblies using 4-40 machine screw fasteners. Fits any application requiring a 4-40 threaded female standoff with a 1.25 inch overall length and hex body.

Installation Notes

Power down and de-energize all equipment before servicing any control board or electronic assembly. Use an appropriately sized wrench or nut driver on the hex body to tighten the standoff without applying torque directly to the PCB. Follow applicable NEC guidelines when working inside electrical enclosures. Avoid over-tightening, which can crack board substrate or strip the 4-40 thread.