Electro Hardware P517M10F21-440 Female Standoff 4-40

Product Description

The ELECTRO HARDWARE P517M10F21-440 is a round female standoff designed to create threaded female connections between panels, boards, and chassis components. It accepts a 4-40 thread and is fully threaded through its entire 0.3125-inch overall length, providing maximum thread engagement for secure fastening. The body measures 0.25 inches in outside diameter and holds a 1-inch thread depth. Constructed from Grade 2 steel with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-S-633 standards, this standoff is suited for light-gauge assemblies where corrosion resistance and dimensional precision are required. It is typically installed by electricians, electronics assemblers, and panel fabricators.

This standoff is used in electronic enclosures, control panels, PCB mounting applications, and general metal fabrication where a compact female threaded spacer is needed. Its round body and standard 4-40 thread size make it a common fit for light-duty electrical and electronic assemblies in both commercial and industrial settings. The zinc-plated steel construction suits indoor and light-exposure environments where basic corrosion resistance is sufficient.

Key Features

• Fully threaded female interior for maximum 4-40 thread engagement
• Zinc-plated steel finish meets ASTM B633 Type 1 and QQ-S-633 standards
• Grade 2 steel construction for reliable light-duty fastening
• Compact round body at 0.25 inches OD for tight-clearance panel layouts
• Length tolerance held to -0.005 to 0.005 inches for precision assemblies

Compatibility

Designed as a standard 4-40 fully threaded round female standoff for use in electronic enclosures, PCB assemblies, and control panel fabrication applications requiring inch-system fasteners.

Installation Notes

Installation is typically performed by electricians or electronics assemblers using standard 4-40 threaded hardware and appropriate hand tools. Ensure mating screws or posts do not exceed the thread depth of the standoff to avoid stripping. De-energize any panel or assembly before installing or removing standoffs in live electrical enclosures. Follow applicable NEC guidelines when used in electrical panel assemblies.