Electro Hardware 1308M03F21440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE 1308M03F21440 is a male-female hex circuit board standoff designed to create fixed spacing between PCBs, mounting panels, and chassis components in electronic assemblies. Machined from brass with a zinc-plated finish, this standoff measures 0.3438 inches in overall length with a 3/16-inch (0.1875-inch) width across flats. The male end threads at 4-40 and the female end accepts a mating 4-40 fastener, allowing boards to be stacked or secured at a consistent, repeatable height. It meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards for finish quality. Electronics technicians, panel builders, and OEM assembly crews use these standoffs during control board installation in HVAC equipment, industrial controls, and low-voltage panel work.

This standoff is suited for use in residential and light commercial electronic assemblies where brass construction and zinc plating are required for corrosion resistance and reliable electrical isolation between board layers. It is commonly installed in HVAC control boards, relay panels, variable frequency drives, and similar enclosures where repeatable PCB spacing and secure mechanical fastening are critical. The hex body allows wrench engagement for precise torque application without slipping, making it practical in production and field-service environments alike.

Key Features

• Male-female thread configuration accepts 4-40 fasteners on both ends for stackable PCB mounting
• Hex body shape allows standard wrench or nut driver engagement during installation
• Brass construction with zinc-plated finish meets ASTM B633 Type 1 and QQ-B-626 Comp 22 standards
• Overall length of 0.3438 inches (11/32 inch) with a length tolerance of -0.005 to 0.005 inches for consistent board spacing
• 3/16-inch width across flats fits standard hex tooling
• Thread depth of 1/4 inch on the female end provides full thread engagement with standard 4-40 screws

Compatibility

Designed as an OEM-style hardware component for PCB assemblies requiring 4-40 thread standoffs with a brass, zinc-plated hex body conforming to ASTM B633 Type 1 and QQ-B-626 Comp 22 finish standards.

Installation Notes

Installation is typically performed by electronics technicians or panel builders during board assembly or field replacement. Power down and de-energize all circuits before handling or repositioning any PCB or standoff hardware. Use a properly sized nut driver or hex wrench to engage the hex body and avoid over-tightening, which can crack the PCB mounting hole or strip the brass threads. Follow applicable IPC assembly standards and equipment manufacturer guidelines for recommended torque ranges on 4-40 brass hardware.