Electro Hardware S593-M10-F21-E Round Board Spacer

Product Description

The ELECTRO HARDWARE S593-M10-F21-E is a round, female unthreaded circuit board spacer designed to create standoff clearance between a PCB and a mounting surface. Machined from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, it provides corrosion resistance in light-duty control panel and electronics enclosure environments. The spacer measures 1.5 inches overall length with an inside diameter of 0.116 inches and an outside diameter of 0.25 inches, sized for a Number 4 screw. Electronics assemblers, panel builders, and HVAC controls technicians use this type of hardware when mounting control boards that require a fixed air gap for heat dissipation or wiring clearance.

This spacer is suited for residential and commercial control board installations, electronics enclosures, and panel assembly work where a rigid, non-threaded female standoff is required. It is commonly installed during PCB mounting in HVAC control panels, industrial enclosures, and low-voltage control systems. The zinc-plated steel construction holds up in indoor environments where moderate moisture resistance is needed without requiring stainless hardware.

Key Features

• Female unthreaded design accepts Number 4 screws for secure board mounting
• 1.5 inch overall length provides consistent standoff height between PCB and chassis
• 0.116 inch inside diameter with a tolerance of 0.000 to 0.010 inches for precise fit
• 0.25 inch outside diameter round body for compact footprint on crowded boards
• Grade 2 steel construction with zinc plating per ASTM B633 and QQ-S-633 Type 1
• Length tolerance held to minus 0.005 to plus 0.005 inches for consistent stack height

Compatibility

Designed as an OEM-style replacement or direct-use standoff for circuit board mounting applications requiring a Number 4 screw, female unthreaded, round steel spacer with 1.5 inch overall length.

Installation Notes

Panel builders and electronics technicians should de-energize all circuits before servicing or mounting control boards. Install spacers before placing the PCB to ensure proper alignment with mounting holes. Use hand tools only when seating the board against the spacers to avoid cracking the PCB substrate. Follow applicable NEC guidelines when working inside energized enclosures.