Electro Hardware S285M10F21E Circuit Board Spacer Steel

Product Description

The ELECTRO HARDWARE S285M10F21E is a round, female unthreaded circuit board spacer designed to maintain precise separation between PCBs and mounting surfaces in electronic assemblies. Manufactured from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, it delivers corrosion resistance suitable for industrial and commercial control board applications. The spacer measures 0.125 inches overall length, 0.1875 inches outside diameter, and 0.116 inches inside diameter, sized for a number 4 screw. Electricians, controls technicians, and electronics assembly professionals install these spacers when mounting circuit boards in HVAC control panels, electrical enclosures, and similar equipment.

This spacer is used in light-duty electronic mounting applications where a small, precise standoff is needed between a circuit board and a panel or chassis surface. It is appropriate for residential and commercial HVAC control boards, low-voltage wiring panels, and industrial electronic enclosures where number 4 fasteners are the standard mounting hardware. Its compact diameter and short overall length make it well suited for dense PCB layouts with limited clearance.

Key Features

• Female unthreaded design accepts a number 4 screw for secure board mounting
• Grade 2 steel construction for reliable mechanical performance in control panel environments
• Zinc-plated finish per ASTM B633 and QQ-S-633 Type 1 for corrosion resistance
• 0.125 inches overall length with a length tolerance of -0.005 to 0.005 inches for consistent stack height
• Inside diameter tolerance of 0.000 to 0.010 inches ensures proper screw fitment
• Round body shape with 0.1875 inches outside diameter for compact PCB spacing applications

Compatibility

Designed as an OEM-style replacement or standard-use circuit board spacer for number 4 screw mounting configurations in electronic control panel assemblies.

Installation Notes

Installation is performed by electricians or controls technicians during circuit board mounting or replacement procedures. Always de-energize the control panel and discharge any capacitors before handling circuit boards or installing spacers. Use the appropriate number 4 screw and driver to avoid overloading the unthreaded female bore. Follow applicable NEC guidelines for work inside electrical enclosures.