Electro Hardware S357M01F21C Round Pcb Spacer Brass

Product Description

The ELECTRO HARDWARE S357M01F21C is a round, female unthreaded circuit board spacer designed to create precise standoff clearance between a PCB and a mounting surface. Built from brass with a zinc-plated finish meeting ASTM B633 and QQ-B-626 Comp 22 Type 1 standards, this spacer delivers corrosion resistance and dimensional consistency in board-mounting applications. It accepts a No. 2 screw, measures 1.25 inches in overall length, and has an inside diameter of 0.089 inches with an outside diameter of 0.1875 inches. Electricians, electronics technicians, and control-board assemblers use this hardware when mounting PCBs inside HVAC control panels, equipment enclosures, and similar assemblies.

This spacer is suited for residential and light commercial applications where a No. 2 fastener is used to secure circuit boards at a fixed standoff height of 1.25 inches. Typical install scenarios include control board mounting in HVAC equipment, electrical enclosures, and industrial panel assemblies where consistent board-to-surface clearance and secure fastening are required. The zinc plating provides added protection in environments subject to moderate humidity or condensation exposure.

Key Features

• Female unthreaded body accepts No. 2 screw for secure board-to-surface standoff
• Brass construction with zinc-plated finish meets ASTM B633 and QQ-B-626 Comp 22 Type 1 standards
• 1.25 inch overall length with tight length tolerance of -0.005 to 0.005 inches for consistent stack height
• Inside diameter of 0.089 inches with tolerance of 0.000 to 0.010 inches for reliable fastener fit
• Round body profile, 0.1875 inches outside diameter, fits standard PCB mounting hole layouts
• Inch measurement system; sold individually with a minimum order quantity of 1

Compatibility

Designed as an OEM-style replacement or service spacer for circuit board mounting assemblies using No. 2 screw fasteners in standard inch-measurement configurations.

Installation Notes

Installation is performed by electronics technicians or qualified electricians during control board assembly or replacement. De-energize all equipment and follow applicable NEC guidelines before working inside any electrical enclosure. Use a No. 2 screw of appropriate length to account for the full 1.25 inch standoff height plus board and mounting surface thickness. Avoid over-torquing into the unthreaded female bore, as brass can deform under excessive fastener load.