Electro Hardware P513M03F21-440 Hex Standoff 4-40 0.25in

Product Description

The ELECTRO HARDWARE P513M03F21-440 is a female hex circuit board standoff designed to create precise spacing between PCBs and mounting surfaces in electronic assemblies. The standoff features a 4-40 female thread, a hex body shape measuring 0.25 inches across the flats, and an overall length of 0.25 inches. It is manufactured from brass with a zinc-plated clear chromate finish per ASTM B633 Type 1 and QQ-B-626 Comp 22, providing corrosion resistance in control board and enclosure applications. This hardware is specified by electronics assemblers, HVAC controls technicians, and electricians when mounting PCBs inside equipment enclosures.

This standoff is suited for use in low-profile PCB mounting applications where precise panel-to-board spacing is required. Common install scenarios include control boards inside HVAC units, electrical panel sub-assemblies, and industrial enclosures. The compact 0.25-inch overall length makes it appropriate for tight clearance situations where standard longer standoffs would create interference. The hex body allows for wrench or socket tightening, ensuring consistent seating torque without slippage.

Key Features

• Female 4-40 thread accepts a matching 4-40 male screw for secure PCB attachment
• Hex body shape allows tool engagement for consistent installation
• Brass base material with zinc-plated clear chromate finish per ASTM B633 Type 1
• Meets QQ-B-626 Comp 22 federal specification for brass hardware
• 0.25-inch overall length suits low-profile and tight-clearance PCB mounting
• Length tolerance of -0.005 to +0.005 inches for precise stack-up control

Compatibility

Designed as an OEM-style replacement or new-installation standoff for applications using 4-40 threaded PCB mounting hardware in inch-system assemblies.

Installation Notes

Installation should be performed by a qualified electronics assembler or controls technician. Always de-energize and lockout the equipment before handling or replacing circuit board hardware. Use an appropriately sized hex driver or nut driver sized for 0.25-inch across-flats hex bodies to avoid rounding the standoff. Follow IPC assembly standards and equipment manufacturer torque guidelines when specified.