Electro Hardware S801-M10-F21-E Circuit Board Spacer Steel

Product Description

The ELECTRO HARDWARE S801-M10-F21-E is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between a printed circuit board and a mounting surface. Manufactured from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, it provides corrosion resistance in typical indoor control panel environments. The spacer measures 0.375 inches overall length, with a 0.116 inch inside diameter and a 0.3125 inch outside diameter. It accepts a No. 4 screw. HVAC, electrical, and electronics technicians use these spacers during control board installations and enclosure builds where board clearance and isolation are required.

This spacer is suited for use in residential and light commercial applications wherever circuit boards must be mounted with controlled spacing from a chassis, panel, or sub-plate. Common install scenarios include HVAC control board replacements, electrical enclosure assemblies, and industrial control panel builds. The female unthreaded design allows a No. 4 fastener to pass through cleanly, making it appropriate for through-bolt or standoff stacking configurations. Sold individually, it is a direct-replacement or supplemental hardware item for technicians who need to source individual fastener components.

Key Features

• Female unthreaded round body accepts No. 4 screws
• Overall length of 0.375 inches holds consistent board standoff distance
• 0.3125 inch outside diameter and 0.116 inch inside diameter with tight tolerances
• Grade 2 steel construction meets ASTM B633 and QQ-S-633 Type 1 standards
• Zinc-plated finish provides corrosion resistance for panel and enclosure use
• Length tolerance of -0.005 to 0.005 inches ensures reliable fitment in precision assemblies

Compatibility

Designed as an OEM-style hardware spacer for circuit board mounting applications requiring a No. 4 screw size, round body, female unthreaded type, with a 0.375 inch overall length and 0.3125 inch outside diameter in inch-system assemblies.

Installation Notes

Installation is typically performed by licensed HVAC technicians, electricians, or electronics assembly personnel. Always de-energize and lock out the equipment before working inside any control panel or enclosure. Use appropriate No. 4 fasteners and avoid overtightening, which can crack circuit board mounting pads or deform the spacer body. Follow applicable NEC guidelines when assembling or servicing electrical enclosures.