Electro Hardware S873-M01-F21-G Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S873-M01-F21-G is a round, female unthreaded circuit board spacer designed to create precise standoff clearance between a PCB and its mounting surface. Sized at 1.5 inches overall length with an inside diameter of 0.141 inches and an outside diameter of 0.3125 inches, this spacer accommodates a No. 6 screw thread. The body is machined from brass and finished with a zinc plating that meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards. It is installed by electronics technicians and field service technicians working on control boards in HVAC, electrical, and industrial panel applications.

This spacer is suited for use in residential and light commercial control board assemblies where consistent PCB standoff height is required. The female unthreaded bore allows a No. 6 fastener to pass through, making it compatible with standard PCB mounting patterns. Typical applications include mounting control boards in HVAC equipment, electrical enclosures, and equipment panels where vibration resistance and reliable board clearance are priorities. Its compact outside diameter of 0.3125 inches keeps board real estate usage minimal.

Key Features

• Female unthreaded bore sized for No. 6 screw, inside diameter 0.141 inches
• 1.5 inch overall length with a tight length tolerance of -0.005 to 0.005 inches
• 0.3125 inch outside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Brass construction with zinc plating for corrosion resistance
• Meets ASTM B633, QQ-B-626 Comp 22 Type 1 fastener standards
• Round body profile for consistent seating against PCB mounting surfaces

Compatibility

Designed as an OEM-style round circuit board spacer for No. 6 screw applications in standard inch-measurement PCB mounting configurations.

Installation Notes

Installation is performed by electronics or HVAC service technicians during control board replacement or new panel assembly. De-energize all circuits and discharge any capacitors before handling the control board. Use appropriately sized No. 6 fasteners to avoid damaging the unthreaded bore. Follow applicable NEC guidelines and equipment manufacturer instructions when reassembling control board assemblies.