Electro Hardware S809-MO4-F16-H Round Board Spacer Aluminum

Product Description

The ELECTRO HARDWARE S809-MO4-F16-H is a round, female unthreaded circuit board spacer machined from aluminum alloy grade T-3 per fastener standard QQ-A-225A Comp 2. It measures 0.5 inches overall length with an outside diameter of 0.3125 inches and an inside diameter of 0.171 inches, sized to accept a number 8 screw. The uncoated aluminum construction keeps weight low while providing adequate rigidity for PCB standoff applications. This spacer creates a controlled gap between a circuit board and its mounting surface, maintaining clearance for airflow and preventing electrical contact between the board and chassis. Licensed electronics technicians, HVAC controls installers, and panel fabricators install this type of hardware during board mounting and assembly work.

This spacer is suited for residential and light commercial control board assemblies where a compact, round standoff is needed for number 8 screw patterns. Typical applications include HVAC control boards, motor drive panels, and general electrical enclosure assemblies where consistent board standoff height and precise dimensional tolerances are required. The inch-system dimensions make it a direct fit for standard North American PCB mounting layouts.

Key Features

• Female unthreaded design accepts a number 8 screw through the 0.171 inch inside diameter bore
• 0.5 inch overall length with a tight length tolerance of -0.005 to 0.005 inches for consistent standoff height
• 0.3125 inch outside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Aluminum grade T-3 construction per QQ-A-225A Comp 2 fastener standard
• Uncoated finish - no coating to crack, flake, or interfere with grounding contact
• Round body profile for straightforward installation in standard PCB standoff holes

Compatibility

Designed as an OEM-style replacement or new-installation spacer for circuit board assemblies requiring a number 8 screw, female unthreaded, round aluminum standoff with 0.5 inch overall length and 5/16 inch outside diameter.

Installation Notes

Install by a qualified electronics technician or controls installer. De-energize and lock out the control panel or equipment before accessing any circuit board. Use appropriately sized hand tools to avoid deforming the aluminum body. Do not overtighten the mating screw, as the unthreaded bore is not designed to grip threads and over-torquing can damage the board or spacer.