Electro Hardware P521M06F16-440 Hex Standoff 4-40 3/8in

Product Description

The ELECTRO HARDWARE P521M06F16-440 is a female hex circuit board standoff designed to create measured spacing between PCBs and mounting surfaces in electronic assemblies. Machined from aluminum alloy to the QQ-A-225A Comp 2 standard with a bright anodized finish, this standoff accepts a 4-40 threaded fastener and measures 0.375 inches overall length with a 0.25 inch width across flats. The hex body shape allows for wrench engagement during installation and removal. It is installed by electronics technicians and field service personnel working on control boards in HVAC, electrical, and industrial equipment.

This standoff is suited for use in residential and commercial electronic control assemblies where a 4-40 thread pattern is required and controlled board-to-surface clearance is necessary. Typical applications include control board mounting in HVAC equipment, electrical enclosures, and panel assemblies. The compact 3/8 inch body length makes it appropriate for installations with limited vertical clearance between stacked boards or between a board and a chassis surface.

Key Features

• Female 4-40 thread accepts standard 4-40 machine screws on both ends
• Hex body shape allows wrench engagement for secure, controlled installation
• Aluminum construction with bright anodized finish resists corrosion and wear
• Meets QQ-A-225A Comp 2 fastener standard for dimensional and material compliance
• 0.375 inch overall length provides consistent board spacing in tight assemblies
• Length tolerance of -0.005 to +0.005 inches ensures consistent stacking height

Compatibility

Designed as a standard 4-40 female hex circuit board standoff for use in electronic assemblies requiring inch-series fasteners and aluminum standoff hardware conforming to QQ-A-225A Comp 2.

Installation Notes

Installation is performed by electronics technicians or qualified service personnel. Power down all equipment and discharge any stored electrical energy before handling circuit boards or standoffs. Use an appropriately sized hex wrench or nut driver on the hex flats to seat the standoff without over-torquing the aluminum threads. Avoid cross-threading when engaging 4-40 fasteners, as aluminum threads are more susceptible to damage than steel.