Electro Hardware S789-M01-F21-I Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S789-M01-F21-I is a round, female unthreaded circuit board spacer designed to maintain precise standoff clearance between a PCB and a mounting surface or adjacent board layer. Manufactured from brass and finished with zinc plating to ASTM B633, QQ-B-626 Comp 22 Type 1 standards, this spacer provides corrosion resistance suitable for electronic enclosure environments. It accepts a No. 10 screw, measures 0.1875 inches overall length, 0.194 inches inside diameter, and 0.3125 inches outside diameter. Electricians, electronics technicians, and panel builders use this type of hardware when securing control boards inside HVAC units, electrical panels, or similar assemblies.

This spacer is suited for residential and light commercial applications wherever a No. 10 fastener is used to mount a circuit board. Common install scenarios include securing control boards inside furnace and air handler cabinets, motor drive enclosures, and electrical junction assemblies. The female unthreaded bore accepts a pass-through screw, allowing the fastener to thread into a standoff or nut on the opposite side of the mounting surface. Its compact round profile fits tight board layouts with minimal clearance requirements.

Key Features

• Female unthreaded bore sized for No. 10 screws with 0.194 inches inside diameter
• Brass construction with zinc-plated finish meets ASTM B633, QQ-B-626 Comp 22 Type 1
• 0.1875 inches overall length with a tight length tolerance of -0.005 to 0.005 inches
• Inside diameter tolerance of 0.000 to 0.010 inches for consistent screw fit
• Round body shape, 0.3125 inches outside diameter, suits compact PCB layouts
• Sold individually with no minimum order quantity beyond a single piece

Compatibility

Designed as an OEM-style replacement or new-installation spacer for circuit board mounting applications using No. 10 screw hardware in inch-measurement fastener systems.

Installation Notes

Installation is performed by electronics technicians or electricians during control board mounting or replacement. De-energize and lock out the equipment before handling any circuit board or internal enclosure hardware. Use a correctly sized screwdriver or nut driver to avoid deforming the spacer body. Follow applicable NEC guidelines when working inside electrical enclosures.