Electro Hardware P577M09F16-440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE P577M09F16-440 is a female hex circuit board standoff with a 4-40 thread size and a 1.25-inch overall length. It features a hexagonal body profile that accepts a driver for secure installation and a female threaded bore that accepts a mating screw to stack or elevate PCBs. Constructed from 18-8 and Grade 303 stainless steel with an anodized bright finish, it meets the QQ-S-763 fastener standard. The 0.25-inch width across flats suits standard hex drivers. This standoff is intended for use by electronics assemblers, control board technicians, and HVAC or electrical panel builders working with circuit board mounting hardware.

This standoff is suited for residential and commercial electronic assemblies where circuit boards must be elevated, separated, or secured within enclosures. Typical applications include HVAC control board mounting, electrical panel PCB installations, and industrial equipment assemblies where stainless steel hardware is specified for corrosion resistance or compliance with stainless fastener standards. The 4-40 thread size is a common pitch in light-duty circuit board fastening applications.

Key Features

• Female hex standoff accepts 4-40 threaded fasteners for PCB stacking or elevation
• 18-8 and Grade 303 stainless steel construction for corrosion resistance
• Anodized bright finish meets QQ-S-763 fastener standard
• 1.25-inch overall length with a tight length tolerance of -0.005 to 0.005 inches
• 0.25-inch width across flats compatible with standard hex drivers
• Hexagonal body shape allows torque application without slipping

Compatibility

Designed as a standard 4-40 female hex circuit board standoff for use in electronic assemblies and control board mounting applications where inch-series hardware conforming to QQ-S-763 is required.

Installation Notes

Installation is performed by electronics assemblers or licensed technicians working on control boards and panel assemblies. Power down and de-energize all circuits before servicing any board or enclosure. Use a properly sized hex driver matching the 0.25-inch width across flats to avoid rounding the standoff body. Follow applicable NEC guidelines when mounting circuit boards inside electrical enclosures.