Electro Hardware S325M01F21E Circuit Board Spacer Brass

Product Description

The ELECTRO HARDWARE S325M01F21E is a round, female unthreaded circuit board spacer designed for use with number 4 screw sizes. Machined from brass and finished with a zinc plating that meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer provides a reliable standoff between a PCB and its mounting surface. It measures 0.75 inches in overall length, with an inside diameter of 0.116 inches and an outside diameter of 0.1875 inches. Electronics technicians, control board assemblers, and HVAC service pros use these spacers when mounting or replacing circuit boards in equipment enclosures.

This spacer is suited for residential and commercial applications wherever a number 4 fastener is used to mount a circuit board. Common install scenarios include furnace control boards, air handler boards, and other low-voltage electronic assemblies that require a fixed standoff height of 0.75 inches between the PCB and the chassis. The female unthreaded body accepts a screw passed through the board, keeping the assembly square and secure without threading into the spacer itself.

Key Features

• Female unthreaded round body accepts number 4 screws for straightforward PCB standoff mounting
• Brass construction with zinc plating meets ASTM B633 and QQ-B-626 Comp 22 Type 1 specifications
• Overall length of 0.75 inches held to a tight length tolerance of -0.005 to 0.005 inches
• Inside diameter of 0.116 inches with a tolerance of 0.000 to 0.010 inches for consistent fastener fit
• Outside diameter of 0.1875 inches provides a compact footprint on dense PCB layouts
• Sold individually, compatible with single-unit purchase

Compatibility

Designed as an OEM-style replacement or service spacer for circuit board assemblies that use number 4 screw fasteners and require a 0.75-inch standoff height.

Installation Notes

Installation is typically performed by electronics technicians or HVAC service professionals during control board replacement or assembly work. Always de-energize the equipment and discharge any stored capacitor voltage before working on or near circuit boards. Use a fastener driver sized for number 4 hardware and avoid over-torquing, which can crack solder joints or the board itself. Follow applicable NEC guidelines when working inside electrical enclosures.