Electro Hardware P577M07F16-440 Round Female Standoff

Product Description

The ELECTRO HARDWARE P577M07F16-440 is a round, fully threaded female standoff designed to create a fixed spacing gap between two mating components in panel, enclosure, and electronics assembly applications. Machined from 18-8 and Grade 303 stainless steel with a bright finish, it meets the QQ-S-763 fastener standard. The standoff features a 4-40 thread size, an overall length of 1.25 inches, an outside diameter of 0.25 inches, and a thread depth of 0.5 inches. These dimensions make it a compact, precise spacer suited for tight board-level layouts or light structural assemblies where corrosion resistance is required.

This standoff is used in residential and commercial electrical panel assemblies, control board mounting, electronic enclosures, and general fastener applications where an internally threaded cylindrical spacer is needed. Installers in electrical, HVAC controls, and industrial automation work rely on this style of standoff when mounting PCBs, terminal strips, or sub-panels at a fixed offset from a base surface. The inch-measurement system and 4-40 thread make it compatible with standard inch-series hardware used throughout North American trade and OEM manufacturing.

Key Features

• Fully threaded female interior accepts 4-40 fasteners from both ends
• 18-8 and Grade 303 stainless steel construction for corrosion resistance
• Bright finish per QQ-S-763 fastener standard
• Round body shape with 0.25 inch outside diameter for compact spacing
• Length tolerance of -0.005 to 0.005 inches for precise stack-up control
• Inch-system dimensions compatible with standard North American hardware

Compatibility

Designed as a standard inch-series female standoff for use with 4-40 threaded fasteners in electrical enclosures, PCB mounting assemblies, and panel fabrication applications.

Installation Notes

Installation is performed by electricians, electronics technicians, or panel fabricators using standard 4-40 screws and appropriate hand tools. De-energize any panel or enclosure before working inside. Do not over-torque the mating fasteners, as the 4-40 thread is fine-pitched and susceptible to stripping under excessive load. Verify thread engagement depth against the 0.5 inch thread depth before specifying fastener length.