Electro Hardware S817-M01-F21-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S817-M01-F21-H is a round, female unthreaded circuit board spacer designed to create precise standoff spacing between a PCB and a mounting surface or between stacked boards. Machined from brass and finished with a zinc plating that meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer measures 0.625 inches overall length with a 0.3125-inch outside diameter and a 0.171-inch inside diameter to accept a number 8 screw. Licensed electricians, electronics technicians, and control board service professionals install this hardware during panel assembly, board replacement, or enclosure builds where consistent board height and electrical isolation are required.

This spacer is suited for residential and commercial control board applications, including HVAC control assemblies, electrical enclosures, and any PCB mounting scenario requiring a standardized number 8 screw clearance hole. The unthreaded female body design allows a screw to pass through freely, making it appropriate for use as a standoff or pass-through spacer in tight board layouts. The brass construction with zinc-plated finish resists corrosion in moderate-humidity environments typical of HVAC equipment cabinets and electrical panels.

Key Features

• Brass construction with zinc-plated finish meeting ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• Female unthreaded body accepts a number 8 screw for pass-through mounting
• 0.625-inch overall length with a tight length tolerance of -0.005 to 0.005 inches
• 0.171-inch inside diameter with tolerance of 0.000 to 0.010 inches for consistent screw fit
• Round body profile with 0.3125-inch outside diameter for compact PCB footprint
• Inch measurement system - dimensions align with standard American fastener sizing

Compatibility

Designed as a standard replacement or assembly spacer for circuit board mounting applications requiring a number 8 screw, female unthreaded round brass standoff.

Installation Notes

Installation is performed by electricians or electronics technicians during board assembly or control board replacement. Always de-energize the equipment and follow lockout/tagout procedures before working inside any electrical enclosure or HVAC control cabinet. No special tooling beyond standard hand tools is required to position these spacers; secure the mating fastener to the manufacturer-specified torque for the surrounding assembly. Verify screw length accounts for the full 0.625-inch spacer height plus board thickness before final assembly.