Electro Hardware S593-M01-F21-H Circuit Board Spacer No. 8

Product Description

The ELECTRO HARDWARE S593-M01-F21-H is a round, female unthreaded circuit board spacer machined from brass and finished with a zinc plating for corrosion resistance. It measures 1.5 inches in overall length with an inside diameter of 0.171 inches and an outside diameter of 0.25 inches, sized for a No. 8 screw. The spacer meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, making it a recognized choice for controlled-environment electronics assemblies. Electricians, electronics technicians, and panel builders use this type of standoff to maintain consistent board-to-chassis clearance and prevent contact faults in control enclosures and circuit board mounting applications.

This spacer is suited for residential and commercial control board mounting, panel assembly, and PCB standoff applications where a No. 8 fastener pattern is specified. Its brass construction makes it appropriate for environments where non-magnetic, thermally stable material is preferred. The female unthreaded bore accepts a No. 8 screw on both ends without threading into the spacer body itself, allowing for straightforward stacking or single-pass fastening. It is sold individually and is compatible with standard inch-measurement hardware layouts.

Key Features

• Female unthreaded bore sized for No. 8 screws with 0.171-inch inside diameter
• Brass construction meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• Zinc-plated finish for added corrosion resistance
• 1.5-inch overall length with tight length tolerance of -0.005 to 0.005 inches
• 0.25-inch outside diameter round body for consistent board standoff clearance
• Inside diameter tolerance of 0.000 to 0.010 inches for reliable fastener fit

Compatibility

Designed as an OEM-style replacement or new-installation standoff for circuit board mounting applications using No. 8 inch-measurement fastener patterns in control enclosures and electronic assemblies.

Installation Notes

Installation is typically performed by licensed electricians or electronics technicians. De-energize the control panel or circuit board assembly completely before handling or installing spacers. Use appropriately sized No. 8 screws and avoid overtightening, which can crack the board or deform the spacer. Follow applicable NEC guidelines for control panel assembly and board mounting clearances.