Electro Hardware S357M01F21E Circuit Board Spacer Brass

Product Description

The ELECTRO HARDWARE S357M01F21E is a round, female unthreaded circuit board spacer designed to maintain precise standoff distance between a printed circuit board and a mounting surface or secondary board. Built from brass with a zinc-plated finish per ASTM B633 and QQ-B-626 Comp 22 Type 1, this spacer delivers corrosion resistance alongside the dimensional accuracy required in tight electronic assemblies. It accepts a No. 4 screw and measures 1.25 inches overall length with a 0.116-inch inside diameter and a 0.1875-inch outside diameter. Licensed electricians, control board technicians, and HVAC electronics assemblers rely on this type of hardware when building or repairing control panel assemblies where board-to-chassis clearance must be consistent and secure.

This spacer is suited for residential and light commercial electronic control board assemblies, including HVAC control boards, low-voltage circuit panels, and other PCB mounting applications where a No. 4 fastener is used. The female unthreaded design allows a screw to pass through or seat without threading into the spacer body, making it appropriate for through-bolt or captured-screw configurations. The zinc-plated brass construction is a standard specification in control board hardware kits and replacement fastener sets across multiple trade applications.

Key Features

• Brass construction with zinc-plated finish meeting ASTM B633 and QQ-B-626 Comp 22 Type 1
• Female unthreaded round body for No. 4 screw compatibility
• 1.25-inch overall length with tight length tolerance of -0.005 to 0.005 inches
• 0.116-inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• 0.1875-inch outside diameter in a compact round profile
• Inch measurement system; UNSPSC Code 31161816

Compatibility

Designed as an OEM-style replacement or assembly component for circuit board mounting applications requiring a No. 4 screw, round female unthreaded brass spacer with 1.25-inch standoff length.

Installation Notes

Installation is typically performed by electronics technicians, licensed electricians, or qualified HVAC service professionals during control board replacement or panel assembly. Power down and de-energize all circuits before handling circuit boards or installing mounting hardware. Use a calibrated torque driver appropriate for No. 4 fasteners to avoid cracking the PCB substrate. Follow applicable NEC guidelines when working inside electrical enclosures.