Electro Hardware S793-M10-F21-H Circuit Board Spacer 8 Steel

Product Description

The ELECTRO HARDWARE S793-M10-F21-H is a round, female unthreaded circuit board spacer designed to create precise standoff clearance between a PCB and a mounting surface or adjacent board. Machined from Grade 2 steel with a zinc-plated finish conforming to ASTM B633 and QQ-S-633 Type 1, it accepts a number 8 screw and holds a consistent 0.25 inch overall length. The 0.171 inch inside diameter and 0.3125 inch outside diameter deliver a compact footprint suited for tight board layouts. Electronics assembly technicians and field service engineers install these spacers during board mounting in control panels, HVAC control boards, and similar low-voltage enclosures.

This spacer is used wherever a number 8 fastener is specified for PCB standoff duty in residential and light commercial control assemblies. Typical applications include mounting control boards inside furnace, air handler, and electrical panel enclosures where consistent board-to-chassis clearance is required to prevent shorts and allow airflow. The zinc-plated steel construction handles the mild environmental conditions common in indoor electrical enclosures. Single-piece packaging makes it straightforward to stock as a service replacement or use as a one-off repair part.

Key Features

• Female unthreaded body accepts a number 8 screw for secure board mounting
• 0.25 inch overall length with a tight length tolerance of -0.005 to 0.005 inches
• 0.171 inch inside diameter with an inside diameter tolerance of 0.000 to 0.010 inches
• 0.3125 inch outside diameter in a compact round body profile
• Grade 2 steel construction with zinc-plated finish meeting ASTM B633 and QQ-S-633 Type 1
• Inch measurement system; compatible with standard number 8 fastener hardware

Compatibility

Designed as an OEM-style replacement or service spacer for circuit board mounting applications using number 8 screw fasteners in inch-dimensioned assemblies.

Installation Notes

Installation is performed by electronics assembly technicians or qualified field service personnel. De-energize and lock out the control panel or enclosure before removing or installing any circuit board hardware. Use a properly sized screwdriver or nut driver matched to the mating number 8 fastener to avoid stripping the spacer seat. Do not over-torque the fastener through the unthreaded bore, as this spacer is designed for clamping force provided by the screw head and mating hardware only.