Electro Hardware P521M07F16-440 Round Female Standoff

Product Description

The ELECTRO HARDWARE P521M07F16-440 is a round, fully threaded female standoff designed to create precise spacing between circuit boards, panels, and chassis components. Machined from 18-8 and Grade 303 stainless steel with a bright finish, it delivers corrosion resistance and dimensional stability in electronics assembly and industrial enclosure applications. The standoff features a 4-40 thread size, an overall length of 0.375 inches, an outside diameter of 0.25 inches, and a thread depth of 0.5 inches. This hardware meets the QQ-S-763 federal specification for stainless steel fasteners. It is installed by electronics assemblers, panel builders, and field technicians working in enclosure fabrication or PCB mounting applications.

This standoff is suited for use in control panels, printed circuit board assemblies, electrical enclosures, and instrument housings where a compact, corrosion-resistant spacer is required. The inch-based dimensions and 4-40 thread make it a standard fit for light-gauge PCB mounting hardware used across commercial and industrial electronics. Its fully threaded female configuration accepts a mating 4-40 male fastener at both ends, allowing secure, stackable standoff arrangements.

Key Features

• Fully threaded female configuration accepts 4-40 male fasteners at both ends
• 18-8 and Grade 303 stainless steel construction for corrosion resistance
• Bright finish meets QQ-S-763 federal specification
• Compact 0.375 inch overall length suits tight PCB spacing requirements
• Round body shape with 0.25 inch outside diameter for consistent fitment in standard standoff clearances

Compatibility

Designed as an OEM-style replacement or new-build component for applications requiring a 4-40 fully threaded female round standoff in inch-standard hardware configurations.

Installation Notes

Installation is performed by electronics assemblers or panel technicians using standard 4-40 tooling. De-energize all circuits and discharge any capacitive loads before working on PCB assemblies or live panels. Use a driver or nut driver sized for the outside diameter to avoid deforming the stainless steel body. Do not overtighten mating fasteners, as the 4-40 thread form in stainless steel is susceptible to galling if installed dry at excessive torque.