Electro Hardware P405M03F21440 Hex Standoff 4-40 2in

Product Description

The ELECTRO HARDWARE P405M03F21440 is a female hex circuit board standoff designed to create precise spacing and secure mechanical fastening between PCBs, enclosure panels, and mounting surfaces. Built from brass with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff delivers corrosion resistance alongside reliable electrical isolation in tight board-to-board stacking applications. The 4-40 female thread accepts standard machine screws at both ends, with a 0.25 inch thread depth. Overall length is 2 inches, and the hex body measures 3/16 inches across flats, allowing engagement with standard hex drivers and nut drivers. Electronics assemblers, panel builders, and field service technicians working on control boards in HVAC, industrial, and electrical enclosure applications rely on this hardware for repeatable, code-compliant standoff installations.

This standoff is suited for use in residential and commercial PCB assemblies, control panel builds, and equipment enclosures where consistent board spacing and mechanical stability are required. It is commonly installed during initial board mounting or replacement of damaged standoffs on control boards found in HVAC systems, variable frequency drives, and similar low-voltage electronics. The hex profile allows installation and removal with standard hand tools without marring the body or surrounding components.

Key Features

• Female 4-40 thread on both ends with 0.25 inch thread depth for secure screw engagement
• 2 inch overall length provides defined PCB-to-panel spacing in stacked assemblies
• Hex body at 3/16 inches across flats compatible with standard nut drivers and hex wrenches
• Brass construction with clear zinc chromate finish for corrosion resistance
• Meets ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards
• Inch measurement system with tight length tolerance of plus or minus 0.005 inches

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit board assemblies using 4-40 machine screw fasteners and requiring 2 inches of board standoff clearance.

Installation Notes

Installation is performed by electronics assemblers, panel builders, or qualified service technicians. Power down and de-energize all circuits before removing or installing circuit board hardware. Use a properly sized nut driver or hex wrench matched to the 3/16 inch across-flats dimension to avoid rounding the hex body. Do not overtighten mating screws beyond the torque specification of the connecting fastener to prevent thread damage in the brass body.