Electro Hardware S509-M07-F16-H Circuit Board Spacer 8

Product Description

The ELECTRO HARDWARE S509-M07-F16-H is a round, female unthreaded circuit board spacer machined from 18-8 303 stainless steel to QQ-S-763 fastener standards. It is designed to create a fixed standoff distance between a printed circuit board and a mounting surface or secondary board. The spacer measures 0.1875 inches overall length, with a 0.25-inch outside diameter and a 0.171-inch inside diameter sized to accept a number 8 screw. The uncoated stainless steel construction resists corrosion and handles repeated assembly cycles without galling. Electronics technicians, electrical panel assemblers, and field service techs working on control boards install this type of spacer during board mounting and replacement tasks.

This spacer is suited for use in residential and light commercial control board assemblies, HVAC equipment PCB mounting, electrical enclosures, and other precision electronic assemblies where consistent board standoff height and corrosion resistance are required. Its compact 3/16-inch length makes it appropriate for applications with tight clearance between a control board and the chassis or mounting bracket beneath it. It is sold and packaged individually, making it practical for single-unit repairs and service calls.

Key Features

• 18-8 303 stainless steel construction meets QQ-S-763 fastener standard for corrosion resistance and dimensional consistency
• Female unthreaded bore accepts a number 8 screw for straightforward board mounting
• 0.1875-inch overall length with a tight length tolerance of -0.005 to 0.005 inches for precise standoff height
• 0.25-inch outside diameter and 0.171-inch inside diameter with inside diameter tolerance of 0.000 to 0.010 inches
• Uncoated finish eliminates coating thickness variability and is compatible with stainless hardware throughout the assembly
• Round body shape seats cleanly against PCB mounting holes and flat chassis surfaces

Compatibility

Designed as an OEM-style replacement or new-installation spacer for circuit board assemblies requiring a number 8 screw, female unthreaded round standoff with a 3/16-inch overall length in stainless steel.

Installation Notes

Installation is performed by electronics technicians or qualified electrical service professionals. Power down and de-energize all equipment before removing or installing control boards or associated hardware. Use the appropriate screwdriver or nut driver sized for the number 8 fastener and avoid overtightening, which can crack PCB mounting pads. Follow applicable NEC guidelines and equipment manufacturer service documentation when accessing electrical enclosures or control boards.