Electro Hardware P357M09F16440 Hex Standoff 4-40

Product Description

The ELECTRO HARDWARE P357M09F16440 is a female hex circuit board standoff designed to create consistent spacing between PCBs, enclosure panels, and mounting surfaces in electronic assemblies. Machined from 303 stainless steel with a plain bright finish, it accepts a 4-40 threaded fastener and provides a 1/4 inch thread depth on the female end. The overall length is 1.25 inches with a hex body measuring 3/16 inch across flats. This fastener is installed by electronics technicians, control board assemblers, and field service technicians working on HVAC control panels, electrical enclosures, and similar equipment requiring reliable board standoff hardware.

This standoff is suited for use in residential and commercial electronic assemblies where a corrosion-resistant, non-coated stainless steel fastener is required. Common applications include circuit board mounting in control enclosures, panel assemblies, and industrial equipment chassis. The 4-40 thread size is a standard coarse-thread designation widely used in North American electronics manufacturing and field service work. The hex body shape allows for wrench engagement during installation and removal without damage to surrounding components.

Key Features

• Female hex standoff accepts 4-40 threaded fasteners on the female end
• 1.25 inch overall length with 1/4 inch thread depth
• 3/16 inch hex width across flats allows standard wrench engagement
• 303 stainless steel construction resists corrosion in demanding environments
• Plain bright finish with no coating — suitable where plating interaction is a concern
• Meets QQ-S-763 fastener standard for stainless steel hardware

Compatibility

Designed as a standard 4-40 female hex circuit board standoff for use in electronic control panels, PCB assemblies, and enclosures requiring stainless steel hardware conforming to QQ-S-763.

Installation Notes

Installation is performed by electronics technicians or qualified field service personnel working on control boards and panel assemblies. Power down and de-energize all circuits before handling or replacing standoffs in live enclosures. Use a properly sized hex wrench or nutdriver on the 3/16 inch flats to avoid rounding the body. Do not over-torque — finger-tight plus a snug wrench turn is sufficient for most PCB standoff applications.