Electro Hardware S509-M07-F16-E Circuit Board Spacer 4 Stainless

Product Description

The ELECTRO HARDWARE S509-M07-F16-E is a round, female unthreaded circuit board spacer designed for No. 4 screw applications in PCB mounting assemblies. Manufactured from 18-8 Grade 303 stainless steel and left uncoated, this spacer provides corrosion resistance and dimensional stability under typical board mounting loads. It measures 0.1875 inches overall length, with an inside diameter of 0.116 inches and an outside diameter of 0.25 inches. The female unthreaded design accepts a No. 4 screw passed through the bore, spacing the board at a fixed standoff height. Electricians, electronics technicians, and control board installers use this type of hardware when mounting PCBs inside HVAC control enclosures, electrical panels, and similar assemblies.

This spacer is suited for residential and light commercial applications wherever printed circuit boards require a rigid, corrosion-resistant standoff. Common install scenarios include control board mounting in HVAC equipment, electrical enclosures, and industrial equipment panels. The stainless steel construction meets fastener standard QQ-S-763, making it appropriate for environments where moisture or chemical exposure may be present. The uncoated finish ensures consistent dimensional tolerances without adding coating thickness that could affect fit.

Key Features

• 18-8 Grade 303 stainless steel construction for corrosion resistance
• Female unthreaded bore accepts No. 4 screw for straightforward PCB standoff mounting
• Overall length of 0.1875 inches with tight length tolerance of -0.005 to 0.005 inches
• Inside diameter of 0.116 inches with tolerance of 0.000 to 0.010 inches
• Outside diameter of 0.25 inches for compact board spacing
• Meets fastener standard QQ-S-763; uncoated finish preserves true dimensions

Compatibility

Designed as an OEM-style replacement or standard hardware component for circuit board mounting applications requiring a No. 4 screw, round female unthreaded spacer in inch measurements.

Installation Notes

Installation is performed by electricians or electronics technicians. Always power down and de-energize the equipment before removing or installing circuit board hardware. Use calibrated hand tools to avoid overtightening, which can crack PCB mounting holes or deform the spacer bore. Follow applicable NEC guidelines when working inside electrical enclosures.