Electro Hardware S513-M10-F21-G Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S513-M10-F21-G is a round, female unthreaded circuit board spacer machined from Grade 2 steel with a zinc-plated finish. It measures 0.25 inches in overall length, with an outside diameter of 0.25 inches and an inside diameter of 0.141 inches. Designed for Number 6 screw applications, this spacer provides precise standoff clearance between a printed circuit board and a mounting surface or secondary board layer. Electronics technicians, panel builders, and field service techs working on control boards in HVAC, electrical, and industrial equipment commonly use spacers of this type during board mounting or replacement procedures.

This spacer fits residential and light commercial control board assemblies where a Number 6 fastener pattern is used. It is suited for applications requiring consistent standoff height and reliable electrical isolation between stacked boards or between a board and a metal chassis. The female unthreaded body accepts a screw from one end, making it straightforward to integrate into standard PCB mounting configurations. It meets ASTM B633 and QQ-S-633 Type 1 standards for zinc plating, providing corrosion resistance in typical indoor panel environments.

Key Features

• Female unthreaded body accepts Number 6 screws for secure PCB standoff mounting
• 0.25 inch overall length with tight length tolerance of -0.005 to 0.005 inches
• 0.141 inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Grade 2 steel construction with zinc-plated finish per ASTM B633 and QQ-S-633 Type 1
• Round body profile for consistent fitment in standard PCB spacer hole patterns
• Sold in minimum order quantities of 5 units

Compatibility

Designed as a standard replacement or new-installation spacer for circuit board assemblies using Number 6 screw hardware and requiring a 0.25 inch standoff height.

Installation Notes

Installation is performed by electronics technicians or qualified trade professionals working on control board assemblies. Always de-energize the equipment and discharge any stored capacitance before handling circuit boards or fasteners. Use hand tools appropriate for Number 6 fasteners and avoid over-torquing, which can crack the board or deform the spacer. Follow applicable electrical codes and manufacturer board-mounting guidelines when positioning spacers.