Electro Hardware S789-MO4-F16-H Circuit Board Spacer No. 8

Product Description

The ELECTRO HARDWARE S789-MO4-F16-H is a round, female unthreaded circuit board spacer designed to create precise standoff clearance between a PCB and a mounting surface. Machined from aluminum alloy Grade T-3 and left uncoated, this spacer meets the QQ-A-225A Comp 2 fastener standard. It accepts a No. 8 screw, measures 0.1875 inches overall length, with an inside diameter of 0.171 inches and an outside diameter of 0.3125 inches. It is used by electricians, electronics technicians, and control board installers in HVAC, industrial, and panel assembly applications wherever board-level spacing and vibration isolation are required.

This spacer is suited for use in residential and light commercial control panel assemblies, printed circuit board mounting applications, and enclosure builds that require consistent, low-profile standoff height. The aluminum construction keeps weight minimal and resists corrosion in typical indoor environments. The female unthreaded bore accepts a No. 8 fastener passed through from the board side, making it straightforward to stack or layer in multi-board configurations.

Key Features

• Female unthreaded body accepts No. 8 screw for clean through-fastener installation
• Aluminum Grade T-3 construction, QQ-A-225A Comp 2 compliant
• Overall length of 0.1875 inches with a tight length tolerance of -0.005 to 0.005 inches
• Inside diameter of 0.171 inches with a tolerance of 0.000 to 0.010 inches
• Outside diameter of 0.3125 inches in a round body profile
• Uncoated finish - no added plating or coating that could interfere with electrical grounding paths

Compatibility

Designed as a standard No. 8 screw-size round circuit board spacer for use in PCB mounting, control panel assembly, and electronic enclosure applications requiring a 0.1875-inch standoff height.

Installation Notes

Installation is typically performed by electronics technicians or licensed electricians during control board assembly or panel wiring. Power down and de-energize the board or panel completely before handling any circuit board hardware. Use appropriately sized tooling for No. 8 fasteners and verify that fastener torque is consistent with PCB manufacturer guidelines. Do not over-torque, as aluminum spacers can deform and compromise board seating.