Electro Hardware S1375-M01-F21-K Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1375-M01-F21-K is a round, female unthreaded brass circuit board spacer designed to create precise standoff clearance between a PCB and a mounting surface. It accepts a 1/4 inch screw, measures 0.75 inches in overall length, and features a 0.257 inch inside diameter with a 0.5 inch outside diameter. The body is brass with a zinc-plated finish, meeting ASTM B633, QQ-B-626 Comp 22, and Type 1 fastener standards. Electronics technicians, electrical contractors, and OEM assembly professionals install this spacer when building or servicing control boards in HVAC units, pool equipment panels, and other electrical enclosures requiring reliable PCB standoff support.

This spacer is suited for use in residential and commercial applications where circuit boards must be mounted with consistent clearance and electrical isolation from a chassis or panel. Typical install scenarios include control board mounting in HVAC air handlers, furnace control enclosures, variable speed drives, and similar low-voltage electronics assemblies. The inch-system dimensions and standard 1/4 inch screw compatibility make it a straightforward fit for common North American panel layouts. It ships individually and can be ordered in single-unit quantities.

Key Features

• Female unthreaded design accepts a standard 1/4 inch screw for secure PCB standoff mounting
• Brass construction with zinc-plated finish meets ASTM B633, QQ-B-626 Comp 22, and Type 1 standards
• Overall length of 0.75 inches with tight length tolerance of -0.005 to 0.005 inches for consistent stack height
• Inside diameter of 0.257 inches with tolerance of 0.000 to 0.010 inches for reliable fastener fit
• Round body profile with 0.5 inch outside diameter fits standard PCB mounting hole patterns
• Inch-measurement system for compatibility with North American hardware specifications

Compatibility

Designed as an OEM-style replacement or new-install standoff for circuit boards requiring a female unthreaded round brass spacer with a 1/4 inch screw size and 0.75 inch overall length in inch-standard applications.

Installation Notes

Installation is typically performed by licensed electricians or electronics technicians during control board assembly or replacement. Always de-energize the equipment and discharge any capacitors before handling circuit boards or installing standoffs. Use appropriately sized screwdrivers or nut drivers and avoid over-torquing fasteners into the unthreaded bore, which can damage the spacer or the PCB. Follow applicable NEC guidelines and equipment manufacturer instructions when mounting control boards in electrical enclosures.