Electro Hardware S857-MO4-F16-G Round Pcb Spacer 6 Aluminum

Product Description

The ELECTRO HARDWARE S857-MO4-F16-G is a round, female unthreaded circuit board spacer designed to create precise standoff distances between a PCB and a mounting surface or between stacked boards. Machined from aluminum alloy grade T-3 per fastener standard QQ-A-225A Comp 2, it offers a lightweight and corrosion-resistant construction without any surface coating. It accepts a number 6 screw, measures 1.25 inches overall length, carries a 0.141 inch inside diameter, and has a 0.3125 inch outside diameter. Electronics technicians, panel builders, and control board installers use these spacers to secure and isolate circuit boards in HVAC controls, electrical enclosures, and industrial panels.

This spacer is suited for residential and commercial applications wherever a number 6 fastener is used to mount a circuit board. Common install scenarios include securing HVAC control boards inside furnace or air handler cabinets, mounting relay or transformer boards in electrical panels, and supporting PCBs in custom control enclosures. The uncoated aluminum finish is appropriate for indoor, dry environments and clean equipment interiors where dielectric isolation is not a primary concern.

Key Features

• Female unthreaded bore accepts number 6 screws for straightforward board mounting
• Aluminum grade T-3 per QQ-A-225A Comp 2 for lightweight, corrosion-resistant performance
• 1.25 inch overall length provides consistent standoff height across a board assembly
• 0.141 inch inside diameter with a tolerance of 0.000 to 0.010 inches for reliable fastener fit
• 0.3125 inch outside diameter with length tolerance of -0.005 to 0.005 inches for precise fit
• Uncoated finish - no coatings to interfere with thermal or mechanical contact

Compatibility

Designed as a standard round PCB spacer for use with number 6 screws in circuit board mounting applications across HVAC, electrical, and industrial control assemblies.

Installation Notes

Power down and de-energize all circuits before removing or installing circuit board hardware. Use a calibrated torque screwdriver to avoid over-tightening through the unthreaded bore, which can crack the PCB substrate. Follow applicable NEC guidelines when installing control boards inside electrical enclosures. Inspect the mounting surface for burrs or debris before seating the spacer to ensure flush, level board support.