Electro Hardware S509M17F16H Round Circuit Board Spacer

Product Description

The ELECTRO HARDWARE S509M17F16H is a round, female unthreaded circuit board spacer designed to maintain precise standoff distances between a PCB and a mounting surface. Built from Nylon Grade 101 material to MIL-P-17091B fastener standard, this spacer accepts a No. 8 screw and measures 0.1875 inches overall length with a 0.25-inch outside diameter and a 0.171-inch inside diameter. The uncoated finish keeps the profile clean and non-conductive. Installed by electronics technicians, PCB assembly professionals, and trade technicians working on HVAC control boards or electrical panel assemblies, this spacer is a direct drop-in component requiring no additional hardware modification.

This spacer is suited for use in residential and light commercial electronic assemblies where a compact, low-profile standoff is required. Typical applications include mounting printed circuit boards to enclosure panels, control board assemblies in HVAC equipment, and general electronic hardware builds where No. 8 screw clearance and a 3/16-inch standoff height are specified. The nylon construction makes it well suited for environments where electrical isolation between the board and chassis is necessary.

Key Features

• Nylon Grade 101 construction provides electrical isolation and corrosion resistance
• Meets MIL-P-17091B fastener standard for consistent dimensional and material quality
• Female unthreaded body accepts No. 8 screw for straightforward installation
• Overall length of 0.1875 inches with tight length tolerance of -0.005 to 0.005 inches
• Inside diameter tolerance of 0.000 to 0.010 inches ensures consistent screw fit
• Uncoated bright finish — no added coating to affect clearance or conductivity

Compatibility

Designed as an OEM-style replacement or new-installation spacer for PCB assemblies requiring a round, female unthreaded No. 8 screw standoff with a 3/16-inch overall length and 1/4-inch outside diameter.

Installation Notes

This spacer is installed by electronics assembly technicians or trade professionals servicing circuit board assemblies. Power down and de-energize all equipment completely before servicing any control board or PCB mounting hardware. Use hand tools only when seating nylon spacers — power tools can crack or deform the nylon body. Follow applicable NEC guidelines when working on control board enclosures in HVAC or electrical equipment.