Electro Hardware P545M10F21-440 Female Standoff 4-40

Product Description

The ELECTRO HARDWARE P545M10F21-440 is a round female standoff designed to create a threaded space between two mating components in electrical enclosures, control panels, and electronic assemblies. The standoff features a 4-40 thread size, a 0.75 inch overall length, and a 0.25 inch outside diameter. The body is fully threaded and manufactured from Grade 2 steel with a zinc-plated finish meeting ASTM B633 Type 1 and QQ-S-633 standards. Licensed electricians, panel builders, and electronics technicians install these standoffs when mounting circuit boards, sub-panels, or barrier strips where defined clearance between surfaces is required.

This standoff is suited for use in residential and commercial electrical control panels, industrial enclosures, and electronic equipment assemblies. The female thread configuration accepts a mating male fastener on both ends, making it practical for stacking or spacing printed circuit boards, mounting brackets, and other flat components that require a fixed air gap or insulation clearance. The small 4-40 thread size is standard in light-duty electronics and instrumentation work.

Key Features

• 4-40 thread size for compatibility with standard light-duty electronic and instrumentation fasteners
• 0.75 inch overall length with a 1 inch thread depth, allowing full engagement of mating screws
• 0.25 inch outside diameter round body for compact panel layouts
• Grade 2 steel construction for reliable strength in fixed mounting applications
• Zinc-plated finish per ASTM B633 Type 1 and QQ-S-633 for corrosion resistance
• Fully threaded body provides consistent thread engagement along the entire length

Compatibility

Designed as an OEM-style replacement or new-installation standoff for control panels and electronic assemblies requiring a 4-40 female threaded spacer with a 0.75 inch overall length and 0.25 inch outside diameter.

Installation Notes

Installation is performed by electricians or electronics technicians using standard hand tools. De-energize all circuits in the enclosure before installing or removing standoffs in live panels. Thread engagement should be verified to avoid cross-threading, which can compromise clamping force and board stability. Follow applicable NEC requirements for panel assembly and component mounting clearances.