Electro Hardware P301M03F21440 Hex Standoff 4-40 3/8in

Product Description

The ELECTRO HARDWARE P301M03F21440 is a female hex circuit board standoff designed for securing PCBs and electronic assemblies in control panels, HVAC control boards, and similar equipment enclosures. This fully threaded standoff features a 4-40 thread size, a 3/8 inch overall length, and a 3/16 inch width across flats. Constructed from brass with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, it offers solid corrosion resistance and reliable thread engagement. Licensed electricians, HVAC technicians, and electronics assemblers use this type of hardware when mounting or replacing control boards in residential and light commercial equipment.

This standoff is suited for use in circuit board mounting applications where a female-threaded hex spacer is required between the board and a mounting surface or between stacked boards. The hex body shape allows for wrench-tightening to consistent torque without slipping. The fully threaded interior runs the full 3/8 inch thread depth, providing maximum thread engagement for the 4-40 fastener. Typical applications include HVAC control board mounting, electrical panel PCB assemblies, and general electronics enclosure work where brass hardware is specified for conductivity or compatibility reasons.

Key Features

• Female 4-40 internal thread, fully threaded through 3/8 inch thread depth
• Hex body shape with 3/16 inch width across flats for wrench engagement
• Brass construction with clear zinc chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards
• Length tolerance of -0.005 to +0.005 inches for precise board spacing
• Inch measurement system, compatible with standard 4-40 fasteners

Compatibility

Designed as an OEM-style replacement or general-use female hex standoff for circuit board mounting applications requiring a 4-40 thread size and 3/8 inch overall length in brass with zinc plating.

Installation Notes

De-energize all equipment and discharge any stored capacitance before working on control boards or electronic assemblies. Use the appropriate hex driver or nut driver sized to 3/16 inch across flats to seat the standoff without stripping the hex body. Do not overtighten — brass threads can strip or crack under excessive torque. Follow applicable NEC guidelines and equipment manufacturer instructions when replacing or installing control board hardware.