Electro Hardware S873-M10-F21-E Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S873-M10-F21-E is a round, female unthreaded circuit board spacer designed to maintain fixed separation between a PCB and a mounting surface or between stacked boards. Machined from Grade 2 steel with a zinc-plated finish conforming to ASTM B633 and QQ-S-633 Type 1, this spacer provides corrosion resistance suitable for indoor electronic enclosures. It accepts a No. 4 screw, measures 1.5 inches overall length (OAL), with an inside diameter of 0.116 inches and an outside diameter of 0.3125 inches. Technicians installing or servicing control boards in HVAC equipment, electrical panels, or electronic assemblies will find this spacer a direct fit for standard No. 4 fastener configurations.

This spacer is used in residential and light commercial applications wherever circuit boards require a standoff mount. Common install scenarios include HVAC control board replacement, VFD enclosures, relay panels, and general electronic equipment assemblies. The female unthreaded design accepts a No. 4 screw passed through from the board side, making it well suited for through-mount PCB standoff applications. It ships individually and is sold in single-piece quantities.

Key Features

• Grade 2 steel construction with zinc-plated finish per ASTM B633 and QQ-S-633 Type 1
• Female unthreaded body accepts No. 4 screws for through-mount PCB standoff applications
• 1.5 inches OAL with tight length tolerance of -0.005 to 0.005 inches for consistent board spacing
• Inside diameter of 0.116 inches with tolerance of 0.000 to 0.010 inches
• Round body profile, 0.3125 inches outside diameter, for standard PCB mounting footprints
• Inch measurement system; single-piece packaging

Compatibility

Designed as a standard No. 4 screw circuit board spacer for use in HVAC control board assemblies, electrical enclosures, and general electronic equipment requiring female unthreaded PCB standoffs in the inch measurement system.

Installation Notes

Installation is typically performed by electricians, HVAC technicians, or electronics assembly technicians. Always de-energize and lock out the equipment before servicing any control board or electronic assembly. Use the correct No. 4 fastener length to avoid bottoming out against the unthreaded bore. Ensure mounting surfaces are clean and flat to maintain accurate board spacing within the specified length tolerance.