Electro Hardware S1111-M10-F21-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1111-M10-F21-H is a round, female unthreaded circuit board spacer designed to maintain consistent standoff distance between a PCB and a mounting surface. Manufactured from Grade 2 steel with a zinc-plated finish per ASTM B633 and QQ-S-633 Type 1, this spacer provides corrosion resistance suitable for electronics assembly and panel mounting applications. It measures 1 inch overall length with a 0.171 inch inside diameter and a 0.375 inch outside diameter, and is sized for a Number 8 screw. Electronics assemblers, panel builders, and electricians use this type of hardware when mounting control boards in HVAC equipment, electrical enclosures, and industrial panels.

This spacer is suited for use in residential and light commercial applications wherever a Number 8 fastener is used to mount a circuit board. Typical install scenarios include HVAC control board mounting, electrical panel sub-assemblies, and enclosure PCB standoff applications. The female unthreaded design accepts a screw from one end, spacing the board away from the mounting surface to prevent electrical shorts and allow for airflow. The round body and standardized dimensions make it straightforward to source as a replacement or new-installation component in any control board servicing job.

Key Features

• Female unthreaded round body sized for Number 8 screw installations
• Grade 2 steel construction meets ASTM B633 and QQ-S-633 Type 1 standards
• Zinc-plated finish provides corrosion resistance in enclosure and panel environments
• 1 inch overall length with tight length tolerance of -0.005 to 0.005 inch
• 0.171 inch inside diameter with 0.000 to 0.010 inch tolerance for consistent fastener fit
• Compact 0.375 inch outside diameter minimizes footprint on densely populated boards

Compatibility

Designed as an OEM-style replacement or new-installation spacer for circuit board mounting applications that require a Number 8 screw, 1 inch standoff height, and a 0.375 inch OD round steel body.

Installation Notes

Installation is typically performed by electronics assemblers, electricians, or HVAC technicians during control board replacement or panel assembly. Always de-energize the equipment and discharge any stored energy before handling circuit boards or installing standoff hardware. Use hand tools appropriate for Number 8 fasteners and avoid overtightening, which can crack the board or distort the spacer. Follow applicable NEC or equipment manufacturer guidelines for board mounting clearances and grounding.