Electro Hardware ESOS-440-12 Hex Standoff 4-40 3/8in Ss

Product Description

The ELECTRO HARDWARE ESOS-440-12 is a female hex circuit board standoff designed to create precise spacing and secure mounting between printed circuit boards and chassis surfaces. Manufactured from 303 stainless steel with a passivated finish, this standoff offers corrosion resistance suitable for demanding electronic assembly environments. The hex body shape allows installation using standard hex drivers or wrenches. It features a 4-40 female thread, an overall length of 0.375 inches, and a width across flats of 0.187 inches. The self-clinching with through-hole fastening method suits PCB-level assembly work in electronics manufacturing, control panel fabrication, and HVAC or electrical equipment service.

This standoff is used in residential and commercial applications wherever circuit boards require rigid, repeatable standoff spacing from a panel or secondary board. Typical installation scenarios include control board assemblies in HVAC equipment, electrical enclosures, and industrial electronics where stainless steel hardware is specified for corrosion resistance or cleanliness requirements. The passivated 303 stainless steel construction makes it appropriate for environments where standard zinc-plated hardware may be unsuitable. Each package contains 25 pieces, supporting batch production or service-inventory stocking.

Key Features

• 4-40 female thread for compatibility with standard 4-40 machine screw fasteners
• 0.375-inch overall length provides consistent PCB standoff spacing
• Hex body shape at 0.187 inches width across flats allows positive wrench engagement
• 303 stainless steel construction with passivated finish for corrosion resistance
• Self-clinching with through-hole fastening method for secure board-level installation
• Sold in packages of 25 pieces to support production and service stock needs

Compatibility

Designed as an OEM-style hardware component for circuit board assemblies requiring 4-40 threaded hex standoffs in inch-measurement applications.

Installation Notes

Installation is typically performed by electronics assembly technicians or qualified electricians and HVAC service professionals working on control board assemblies. Always power down and de-energize equipment completely before servicing circuit boards or replacing standoff hardware. A hex driver or nut driver sized to 0.187 inches across flats should be used to seat and torque the standoff without damaging the hex faces. Follow applicable NEC or equipment manufacturer guidelines when working inside electrical enclosures.