Electro Hardware S841-M10-F21-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S841-M10-F21-H is a round, female unthreaded circuit board spacer designed to create a fixed standoff distance between a PCB and a mounting surface. Built from Grade 2 steel with a zinc-plated finish, it measures 1 inch overall length (OAL), with a 0.171 inch inside diameter and a 0.3125 inch (5/16 inch) outside diameter. It accepts a number 8 screw. The zinc plating meets ASTM B633 and QQ-S-633 Type 1 standards, providing corrosion resistance in typical indoor electronic and electromechanical assemblies. Electronics technicians, HVAC controls installers, and electrical panel assemblers use this spacer during board mounting and control module installation.

This spacer suits applications where a printed circuit board must be elevated and isolated from a metal chassis, enclosure, or DIN-mounted subpanel. Common install scenarios include HVAC control board mounting, industrial control enclosures, and electromechanical equipment where a consistent, rigid standoff is required. Its compact outside diameter keeps the footprint small in tight board layouts. Single-piece packaging makes it easy to source for service calls and small-quantity repair jobs.

Key Features

• Grade 2 steel construction with zinc-plated finish meeting ASTM B633 and QQ-S-633 Type 1
• Female unthreaded body accepts a number 8 screw for straightforward board fastening
• 1 inch OAL provides consistent standoff height with a length tolerance of -0.005 to 0.005 inches
• 0.171 inch inside diameter with a tolerance of 0.000 to 0.010 inches for reliable screw fit
• Round body profile with 0.3125 inch outside diameter fits standard PCB mounting hole layouts
• Inch measurement system; sold individually with no minimum order requirement beyond a single unit

Compatibility

Designed as an OEM-style replacement or new-installation spacer for printed circuit board assemblies requiring a round, female unthreaded number 8 screw standoff in inch-measurement applications.

Installation Notes

Power down and de-energize all equipment before removing or installing circuit board spacers. Use appropriately sized screwdrivers or nut drivers; avoid over-torquing, which can crack the PCB substrate. Follow applicable NEC guidelines for control wiring clearances when working inside electrical enclosures. Inspect the mating chassis surface for burrs or debris before seating the spacer to ensure a flush, secure fit.