Electro Hardware P301M12F21440 Hex Standoff 4-40 3/8in

Product Description

The ELECTRO HARDWARE P301M12F21440 is a female hex circuit board standoff designed to create secure, threaded spacing between PCBs and mounting surfaces in electronic enclosures and control panels. It features a 4-40 thread size, a 0.375 inch overall length, and a fully threaded interior with a 3/8 inch thread depth. The body is hexagonal steel with a clear zinc chromate finish meeting ASTM B633 Type 1 and QQ-S-633 standards, providing corrosion resistance appropriate for panel-mount environments. Electricians, controls technicians, and OEM assembly personnel typically install this hardware when mounting circuit boards inside HVAC control boxes, electrical enclosures, and similar equipment.

This standoff is suited for residential and commercial electronic control assemblies where precise PCB spacing and secure thread engagement are required. The hex body accepts a standard wrench or hex driver for installation, allowing controlled torque without slipping. The 3/16 inch width across flats fits standard tooling commonly used in board-level assembly and field service of control panels, including HVAC furnace control boards, variable speed drive enclosures, and industrial relay panels.

Key Features

• Female 4-40 thread accepts standard 4-40 machine screws for board-side fastening
• Fully threaded interior with 3/8 inch thread depth for full engagement
• Hexagonal body with 3/16 inch width across flats for wrench-driven installation
• Steel construction with clear zinc chromate finish per ASTM B633 Type 1 and QQ-S-633
• 0.375 inch overall length provides consistent PCB standoff height in tight enclosures

Compatibility

Designed as a standard 4-40 female hex standoff for use in circuit board mounting applications requiring 3/8 inch OAL spacing in electronic control enclosures.

Installation Notes

Installation is typically performed by licensed electricians or electronics technicians during control panel assembly or field board replacement. Always de-energize the control panel and verify zero voltage before working inside any enclosure. Use an appropriately sized hex wrench or nut driver matched to the 3/16 inch flats to avoid rounding the standoff body. Follow applicable NEC guidelines for enclosure work and observe any OEM torque recommendations for the specific board assembly being serviced.