Electro Hardware S293M01F21E Round Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S293M01F21E is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between PCBs and mounting surfaces in electronic assemblies. Machined from brass and finished with a zinc plating per ASTM B633 and QQ-B-626 Comp 22 Type 1, this spacer delivers corrosion resistance alongside dimensional accuracy. It measures 0.25 inches overall length with a 0.1875 inch outside diameter and a 0.116 inch inside diameter, sized to accept a number 4 screw. Electricians, electronics technicians, and control board assemblers use this type of hardware when mounting circuit boards inside HVAC control enclosures, electrical panels, and industrial equipment.

This spacer is suited for residential and commercial applications wherever a number 4 fastener is used to secure a circuit board at a fixed standoff height. Common installations include HVAC control board mounting, motor drive assemblies, and low-voltage control panels. The inch-system dimensioning and ASTM B633 zinc-plated brass construction make it compatible with standard domestic control board hardware configurations. Package quantity is one piece per unit.

Key Features

• Female unthreaded round body accepts number 4 screws for straightforward circuit board mounting
• Brass base material with zinc plating per ASTM B633 and QQ-B-626 Comp 22 Type 1 for corrosion resistance
• 0.25 inch overall length with tight length tolerance of -0.005 to 0.005 inches for consistent standoff height
• 0.116 inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• 0.1875 inch outside diameter in a compact round profile for dense PCB layouts
• Lightweight at 0.002 pounds, minimizing added load on circuit board assemblies

Compatibility

Designed as a standard inch-system female unthreaded round spacer for use with number 4 screw fasteners in circuit board mounting applications across HVAC controls, electrical enclosures, and electronic assemblies.

Installation Notes

Installation is typically performed by electronics technicians or licensed electricians during control board assembly or replacement. Always de-energize and lock out the equipment before handling circuit board hardware. Use a correctly sized number 4 screw and avoid overtightening, which can crack the PCB substrate or deform the spacer. Follow applicable NEC guidelines when installing control boards inside electrical enclosures.