Electro Hardware S785-MO4-F16-E Round Pcb Spacer No. 4

Product Description

The ELECTRO HARDWARE S785-MO4-F16-E is a round, female unthreaded circuit board spacer designed to maintain precise standoff clearance between a PCB and a mounting surface or adjacent board. Machined from T-3 grade aluminum to QQ-A-225A Comp 2 specification, it delivers consistent dimensional tolerances and a clean, uncoated finish suited to most electronic assembly environments. The spacer measures 0.125 inches overall length with a 0.116 inch inside diameter and a 0.3125 inch outside diameter, accepting a No. 4 screw. Electricians, electronics technicians, and control-board assemblers working on HVAC, electrical, or industrial control applications will find this a reliable OEM-style hardware component.

This spacer is used wherever a No. 4 screw fastener is required to stack or stand off a circuit board in a residential or light-commercial control enclosure. Typical applications include HVAC control boards, low-voltage relay panels, and general electronic assemblies that require repeatable spacing and secure mechanical support. The female unthreaded bore allows the fastener to pass through cleanly without engaging threads in the spacer body itself, keeping the assembly straightforward and the board properly isolated from the mounting plane.

Key Features

• T-3 grade aluminum construction per QQ-A-225A Comp 2 fastener standard
• Female unthreaded bore accepts No. 4 screw fasteners
• 0.125 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
• Round body profile with 0.3125 inch outside diameter for consistent seating
• Uncoated finish - compatible with most PCB assembly environments without coating interference

Compatibility

Designed as an OEM-style hardware replacement or new-assembly component for circuit board mounting applications requiring a No. 4 screw, female unthreaded, round aluminum spacer with a 0.125 inch standoff length.

Installation Notes

Installation is performed by electronics technicians or control-board assemblers during panel build or board replacement service. Power down and de-energize the control enclosure fully before handling any circuit board hardware. Use a calibrated torque driver appropriate for No. 4 fasteners to avoid over-compressing the spacer or distorting the PCB mounting holes. Verify spacer seating is flush and square before securing the final fastener.