Electro Hardware S857-MO4-F16-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S857-MO4-F16-H is a round, female unthreaded circuit board spacer machined from aluminum grade T-3 to the QQ-A-225A Comp 2 fastener standard. It measures 1.25 inches overall length with an inside diameter of 0.171 inches and an outside diameter of 0.3125 inches (5/16 inches). Designed for No. 8 screw applications, this spacer maintains consistent board standoff height on printed circuit board assemblies. The uncoated finish and aluminum construction suit environments where lightweight, non-ferrous hardware is required. Electricians, electronics technicians, and control board assemblers use this type of component during board mounting and panel assembly work.

This spacer is used in residential and commercial electronic control panel assemblies, printed circuit board mounting applications, and equipment enclosures where a precise, repeatable standoff distance is needed between the board surface and the mounting substrate. It is appropriate for light industrial, HVAC control board, and general electrical panel assembly scenarios where a No. 8 screw pattern is specified and aluminum hardware is preferred over steel or nylon alternatives.

Key Features

• Female unthreaded round body accepts No. 8 screws for secure board standoff mounting
• Aluminum grade T-3 construction - lightweight and non-ferrous
• Meets QQ-A-225A Comp 2 fastener standard for consistent material quality
• 1.25-inch overall length with tight length tolerance of -0.005 to 0.005 inches
• Inside diameter tolerance of 0.000 to 0.010 inches for reliable fit on standard No. 8 fasteners
• Uncoated finish - no coating thickness variability affecting final installed dimension

Compatibility

Designed as a standard inch-measurement circuit board spacer for No. 8 screw patterns in printed circuit board and electronic panel assembly applications.

Installation Notes

De-energize and lock out all power to the control panel or circuit board assembly before installing or removing board spacers. This component is installed by electricians or electronics technicians using standard hand tools. Verify screw clearance and board hole alignment before seating the spacer to avoid misalignment that could stress the board. Follow applicable NEC guidelines for enclosure and panel assembly work.