Electro Hardware S1143-M04-F16-H Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1143-M04-F16-H is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between PCBs and mounting surfaces in electronic assemblies. Machined from aluminum Grade T-3 per fastener standard QQ-A-225A Comp 2, this spacer measures 1.5 inches overall length with a 0.171 inch inside diameter and a 0.375 inch outside diameter. It is sized for No. 8 screws and is supplied uncoated. Electronics assemblers, field service technicians, and panel builders install these spacers during board mounting operations where consistent spacing and light weight are required.

This spacer is suited for residential and commercial control panel assemblies, HVAC circuit board installations, and general electronic equipment where a lightweight aluminum standoff is needed. The female unthreaded design accepts a No. 8 fastener passed through the bore, making it straightforward to stack or layer boards at a fixed 1.5 inch standoff height. It is appropriate wherever PCB vibration isolation or air gap clearance between boards and enclosures is required.

Key Features

• Female unthreaded bore sized for No. 8 screws with 0.171 inch inside diameter
• 0.375 inch outside diameter round body for compact footprint on dense boards
• 1.5 inch overall length with a tight length tolerance of -0.005 to 0.005 inches
• Inside diameter tolerance of 0.000 to 0.010 inches for consistent fit
• Aluminum Grade T-3 construction per QQ-A-225A Comp 2 for light weight and corrosion resistance
• Uncoated finish - no coating buildup to affect dimensional fit

Compatibility

Designed as a standard-style aluminum circuit board spacer for use with No. 8 screw fasteners in PCB mounting and standoff applications across HVAC controls, electrical panels, and general electronic assemblies.

Installation Notes

Circuit board spacers are typically installed by electronics technicians or field service personnel during control board replacement or panel assembly. De-energize the equipment and discharge any capacitors before handling circuit boards or installing spacers. Use care not to overtighten the No. 8 fastener through the unthreaded bore, as the female unthreaded design relies on the screw and mating hardware for clamping, not on internal threads. Follow applicable equipment manufacturer guidelines and NEC requirements for panel assembly and grounding when installing boards in electrical enclosures.