Electro Hardware S817-M10-F21-E Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S817-M10-F21-E is a round, female unthreaded circuit board spacer designed to maintain consistent standoff height between a PCB and a mounting surface. Built from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, this spacer provides corrosion resistance suitable for electronic assemblies in demanding environments. It measures 0.625 inches overall length, with an outside diameter of 0.3125 inches and an inside diameter of 0.116 inches, fitting a No. 4 screw. Electronics assemblers, field technicians, and controls installers use these spacers when mounting control boards in HVAC equipment, electrical enclosures, and industrial panels.

This spacer is suited for applications requiring precise board standoff and secure, non-threaded female retention on a No. 4 fastener. Typical use cases include mounting control boards in residential and light commercial HVAC systems, motor control panels, and other electronic assemblies where a fixed, repeatable standoff height is critical. The zinc-plated steel construction handles the vibration and thermal cycling common in mechanical system enclosures. Sold individually, it fits standard board-mounting layouts where a 5/8-inch standoff height is specified.

Key Features

• Female unthreaded design accepts No. 4 screws for secure, non-binding board retention
• 0.625-inch overall length provides consistent PCB standoff height
• Grade 2 steel construction meets ASTM B633 and QQ-S-633 Type 1 standards
• Zinc-plated finish resists corrosion in enclosure and panel environments
• Round body shape with 0.3125-inch OD fits standard board-mounting footprints
• Inside diameter tolerance of 0.000 to 0.010 inches ensures reliable screw fit

Compatibility

Designed as a standard No. 4 screw round circuit board spacer for use in PCB mounting applications requiring a 5/8-inch standoff in inch-measurement assemblies.

Installation Notes

Installation is performed by electronics technicians and controls assemblers. Always power down and de-energize the control panel or equipment before handling circuit boards or mounting hardware. Use appropriately sized No. 4 fasteners and verify that the spacer seating surface is clean and flat to avoid board stress. Follow applicable NEC guidelines when working inside electrical enclosures.