Electro Hardware P529M10F21-440 Female Standoff 4-40

Product Description

The ELECTRO HARDWARE P529M10F21-440 is a round female standoff designed for use in electronic and mechanical assemblies requiring a 4-40 threaded fastener interface. Machined from Grade 2 steel with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-S-633 standards, this standoff provides a corrosion-resistant, fully threaded interior for reliable fastener engagement. The overall length is 0.5 inches with an outside diameter of 0.25 inches. The body is fully threaded to a depth of 1 inch, allowing maximum thread engagement for secure panel-to-board or component-to-chassis mounting. This hardware is installed by electricians, electronics technicians, and mechanical assemblers working with control panels, enclosures, and circuit board assemblies.

This standoff is suited for residential and commercial control panel builds, electronic enclosure assemblies, and printed circuit board mounting applications. Its compact 0.25-inch outside diameter makes it appropriate for tight-pitch layouts where space between mounting points is limited. The zinc-plated steel construction handles typical indoor and light-duty industrial environments. Assemblers working with 4-40 machine screws will find this standoff a direct-fit solution for standard spacing requirements in control boards and instrumentation enclosures.

Key Features

• Fully threaded female interior with 4-40 thread size for secure fastener engagement
• Grade 2 steel construction with zinc-plated finish per ASTM B633 Type 1 and QQ-S-633
• Compact 0.25-inch outside diameter suited for dense PCB and panel layouts
• 0.5-inch overall length with length tolerance of -0.005 to 0.005 inches for precise fit
• Round body shape compatible with standard hex-driver and manual installation

Compatibility

Designed as a standard 4-40 female standoff for use in electronic enclosures, control panels, and circuit board assemblies requiring inch-system fasteners.

Installation Notes

Installation is performed by electronics assemblers or electricians working on panel and PCB mounting. Power down and de-energize all circuits before installing or removing standoffs in live control enclosures. Use appropriately sized hand tools or a torque-limited driver to avoid stripping the 4-40 threads. Follow applicable enclosure and panel assembly standards for your application.