Electro Hardware S1391-M07-F16-K Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S1391-M07-F16-K is a round, female unthreaded circuit board spacer machined from 18-8 and 303 grade stainless steel. It measures 1 inch overall length with a 0.257 inch inside diameter and a 0.5 inch outside diameter. Designed for 1/4 inch screw sizes, this spacer provides a reliable standoff between a PCB and its mounting surface in electronic assemblies. The uncoated bright finish and stainless steel construction make it well suited for environments where corrosion resistance and dimensional stability matter. Technicians and assemblers in HVAC, electrical, and industrial control applications use spacers like this to maintain proper board clearance and prevent short circuits.

This spacer is used wherever a circuit board requires a fixed standoff from a metal or plastic chassis. Common applications include control board assemblies in HVAC equipment, electrical enclosures, and industrial control panels. Its inch-system dimensions and QQ-S-763 fastener standard compliance make it a standard choice for commercial and light industrial assemblies. It is sold individually and can be ordered in single-unit quantities, making it practical for service replacements or small-run builds.

Key Features

• Female unthreaded round body accepts 1/4 inch screws for straightforward PCB mounting
• 18-8 and 303 grade stainless steel construction for corrosion resistance and durability
• 1 inch overall length with a tight length tolerance of -0.005 to 0.005 inches
• 0.257 inch inside diameter with an inside diameter tolerance of 0.000 to 0.010 inches
• Uncoated bright finish — no coating buildup affecting dimensional fit
• Complies with QQ-S-763 fastener standard

Compatibility

Designed as a standard inch-system round circuit board spacer for use with 1/4 inch fasteners in PCB standoff applications across HVAC control boards, electrical enclosures, and industrial panel assemblies.

Installation Notes

Installation is typically performed by electronics assemblers or field technicians during control board replacement or enclosure assembly. Power down and de-energize the control panel or equipment fully before handling any circuit board hardware. Use appropriate hand tools sized for 1/4 inch fasteners and avoid over-torquing, which can crack PCB mounting holes or distort the spacer. Verify board clearance dimensions against the assembly drawing before finalizing fastener length selection.