Electro Hardware ESO-6440-10ZI Hex Standoff 4-40 25 Pack

Product Description

The ELECTRO HARDWARE ESO-6440-10ZI is a female hex circuit board standoff designed to create precise spacing and secure mounting between PCBs, panels, and enclosures. Machined from steel with a zinc-plated finish, this standoff resists corrosion and provides reliable electrical isolation in demanding environments. It features a 4-40 thread size and measures 0.312 inches overall length, with a 0.25 inches width across flats for standard hex driver engagement. The self-clinching through-hole fastening method allows it to be pressed permanently into sheet metal panels, making installation clean and repeatable. This package contains 25 standoffs. Licensed electricians, electronics assemblers, and panel shop technicians are the typical installers.

This standoff is suited for use in residential and commercial electronic assemblies, control panels, HVAC circuit boards, industrial enclosures, and any application requiring a fixed, threaded spacer between board layers or mounting surfaces. Its inch-system dimensions make it a direct fit in North American panel fabrication and electronics manufacturing workflows where 4-40 fastening hardware is standard. The hex body shape allows torque to be applied cleanly with a nut driver or hex key without slipping or marring adjacent components.

Key Features

• 4-40 female thread size for compatibility with standard inch-system machine screws
• 0.312 inches overall length provides precise board-to-board or board-to-panel spacing
• 0.25 inches width across flats allows standard hex driver or nut driver installation
• Steel construction with zinc-plated finish for corrosion resistance
• Self-clinching through-hole fastening method for permanent, clean panel installation
• Hexagonal body shape prevents rotation during tightening
• Sold in a pack of 25 for bench stock and production use

Compatibility

Designed as an OEM-style replacement or bench-stock fastener for circuit board assemblies, control panels, and electronic enclosures requiring 4-40 inch-system threaded standoffs with a 0.312 inches overall length.

Installation Notes

Self-clinching standoffs are pressed into a pre-punched or drilled hole in sheet metal using a arbor press or squeeze tool — never install with a hammer, as this can deform the clinching feature. Ensure the host panel material is compatible with self-clinching hardware before installation. De-energize and lock out all electrical panels before installing or removing standoffs in live assemblies. Follow applicable NEC guidelines when installing hardware inside electrical enclosures.