Electro Hardware S293M10F21E Circuit Board Spacer No. 4

Product Description

The ELECTRO HARDWARE S293M10F21E is a round, female unthreaded circuit board spacer designed to maintain precise standoff clearance between a PCB and a mounting surface or between stacked boards. It accepts a No. 4 screw and measures 0.25 inches overall length (OAL) with a 0.116 inch inside diameter and 0.1875 inch outside diameter. Constructed 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 electronic and electrical enclosure environments. Electronics assemblers, panel builders, and field technicians install this spacer during board mounting and enclosure assembly work.

This spacer is suited for use in residential and light commercial electrical panels, HVAC control board assemblies, and other applications requiring a compact, low-profile PCB standoff. The round body profile and female unthreaded bore make it straightforward to stack or position on a No. 4 screw during assembly. Its small outside diameter of 0.1875 inches fits in tight board layouts where clearance is limited.

Key Features

• Female unthreaded bore accepts No. 4 screws for direct PCB standoff mounting
• 0.25 inch OAL with tight length tolerance of -0.005 to +0.005 inches for consistent board spacing
• Inside diameter tolerance of 0.000 to 0.010 inches for reliable screw fit
• Grade 2 steel construction with zinc-plated finish per ASTM B633 and QQ-S-633 Type 1
• Compact round body at 0.1875 inches OD for use in dense board layouts
• Inch measurement system; UNSPSC Code 31161816

Compatibility

Designed as a standard No. 4 screw PCB standoff spacer suitable for circuit board mounting applications in electronic assemblies, electrical enclosures, and control panel builds where a 0.25 inch female unthreaded round spacer is specified.

Installation Notes

Installation is typically performed by electronics assemblers, panel builders, or licensed electricians during control board mounting or enclosure assembly. De-energize all equipment fully before working inside any electrical enclosure or control panel. Use hand tools appropriate for No. 4 fasteners and avoid over-torquing, which can crack PCB mounting holes or deform the spacer bore. Confirm spacer height and inside diameter match the board layout requirements before final assembly.