Electro Hardware S333M01F21C Circuit Board Spacer Brass

Product Description

The ELECTRO HARDWARE S333M01F21C is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between a PCB and a mounting surface or between stacked boards. Sized at 0.875 inches overall length with a 0.1875 inch outside diameter and a 0.089 inch inside diameter, this spacer accepts a No. 2 screw and provides consistent, repeatable board separation in tight enclosures. Constructed from brass and finished with a zinc plating that meets ASTM B633, QQ-B-626 Comp 22 Type 1, it resists corrosion and maintains dimensional stability under typical service conditions. Electronics technicians and electrical contractors use these spacers during control board installations in HVAC equipment, industrial panels, and commercial electrical enclosures.

This spacer is suited for applications where a No. 2 fastener is used to secure a circuit board to a chassis, DIN rail assembly, or secondary board layer. The round body shape and female unthreaded bore allow the screw to pass through freely while the spacer carries the compressive load, preventing board flex and contact with conductive surfaces. Typical installation environments include residential and light commercial HVAC control boards, relay panels, and OEM equipment assemblies where precise standoff height and corrosion resistance are required.

Key Features

• Female unthreaded round body accepts a No. 2 screw for straightforward fastener compatibility
• 0.875 inch overall length with tight length tolerance of -0.005 to 0.005 inches for consistent stack height
• 0.089 inch inside diameter with tolerance of 0.000 to 0.010 inches ensures proper screw clearance
• Brass base material with zinc-plate finish meets ASTM B633, QQ-B-626 Comp 22 Type 1 standards
• 0.1875 inch outside diameter in a compact round profile fits dense board layouts
• Sold individually, suitable for single-unit replacement or small-quantity service work

Compatibility

Designed for use with No. 2 fasteners in standard circuit board standoff applications across residential and commercial electrical and HVAC control assemblies.

Installation Notes

Installation is performed by electronics technicians or licensed electricians. Always de-energize and lock out the equipment before removing or replacing circuit board hardware. Avoid overtightening the No. 2 screw, as excessive force can crack the PCB or deform the spacer bore. Verify overall length matches the required standoff height before assembly to prevent board stress or unintended contact with the enclosure.