Electro Hardware 1427M03F21-440 Hex Standoff 4-40 7/16 in

Product Description

The ELECTRO HARDWARE 1427M03F21-440 is a male-female hex circuit board standoff designed to separate and support PCBs within electronic enclosures and control panels. This fastener features a 4-40 threaded male post on one end and a 4-40 threaded female receptacle on the other, allowing boards to be stacked or mounted at a fixed, repeatable distance. The body measures 0.25 inches in length with an overall length of 0.4375 inches (7/16 inch). The hexagonal body profile measures 0.25 inches across the flats for easy wrench engagement. Constructed from brass with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-B-626 Comp 22 standards, this standoff delivers corrosion resistance suitable for indoor electronic assemblies.

This standoff is commonly used in HVAC control boards, electrical enclosures, industrial control panels, and other applications where printed circuit boards require secure, isolated mounting. The male-female configuration allows daisy-chain stacking of multiple boards or mounting a single board to a chassis at a consistent 7/16-inch standoff height. Technicians assembling or servicing control panels in commercial or residential HVAC equipment, electrical distribution hardware, or custom electronic builds will find this standoff a reliable off-the-shelf component for 4-40 threaded mounting patterns.

Key Features

• Male-female thread configuration supports PCB stacking and single-board chassis mounting
• 4-40 thread size on both male post and female receptacle
• Hexagonal body at 0.25 inches across the flats allows wrench or nut-driver installation
• Overall length of 0.4375 inches (7/16 inch) with a thread length of 3/16 inch and body length of 0.25 inches
• Brass construction with zinc-plated finish per ASTM B633 Type 1 and QQ-B-626 Comp 22
• Length tolerance held to -0.005 to +0.005 inches for consistent board-to-board spacing

Compatibility

Designed for use in any application requiring a 4-40 male-female hex standoff in the inch measurement system, including circuit board assemblies, control panels, and electronic enclosures where 7/16-inch board separation is required.

Installation Notes

Installation is performed by technicians assembling or servicing electronic control panels and PCB assemblies. Power down and de-energize all circuits before working inside any control enclosure. Use an appropriately sized nut driver or hex wrench on the 0.25-inch across-flats body to tighten without deforming the standoff. Avoid over-torquing brass standoffs, as the material is softer than steel and thread damage is possible with excessive force.