Electro Hardware S289M04F16E Round Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S289M04F16E is a round, female unthreaded aluminum circuit board spacer designed to maintain consistent board standoff distance in electronic assemblies. Manufactured from Aluminum Grade T-3 per fastener standard QQ-A-225A Comp 2, this spacer provides a reliable, lightweight mounting solution. It features a 3/16 inch overall length (0.1875 inches), a 0.116 inch inside diameter, and a 3/16 inch outside diameter (0.1875 inches), with a bright uncoated finish. It is sized for No. 4 screw applications and is suited for electronics assembly work in HVAC control boards, electrical panels, and similar equipment.

This spacer is used in applications requiring precise board-to-board or board-to-chassis separation, including residential and commercial HVAC control assemblies, electrical enclosures, and general electronics manufacturing. The unthreaded female body accepts a No. 4 screw, making it compatible with standard circuit board mounting configurations. Installation is performed by electronics assemblers, OEM technicians, and field service professionals working on control board replacement or new assembly builds.

Key Features

• Aluminum Grade T-3 construction per QQ-A-225A Comp 2 fastener standard
• Female unthreaded body accepts No. 4 screws for straightforward board mounting
• 3/16 inch overall length (0.1875 inches) with a tight length tolerance of -0.005 to 0.005 inches
• 0.116 inch inside diameter with an inside diameter tolerance of 0.000 to 0.010 inches
• Round body shape with bright uncoated finish resists additional coating buildup that could affect fit
• Lightweight aluminum construction reduces overall assembly weight versus steel alternatives

Compatibility

Designed as an OEM-style round circuit board spacer for No. 4 screw mounting configurations in standard electronic and electromechanical assemblies requiring a 3/16 inch standoff.

Installation Notes

Circuit board spacers are installed by electronics assemblers or qualified technicians during board mounting or replacement. De-energize all equipment and discharge any capacitors before servicing control boards or electronic assemblies. Use a torque-limited driver appropriate for No. 4 fasteners to avoid deforming the unthreaded body. Verify board standoff height requirements before selecting spacer quantity and stacking configuration.