Electro Hardware S517M17F16E Circuit Board Spacer Nylon

Product Description

The ELECTRO HARDWARE S517M17F16E is a round, female unthreaded circuit board spacer designed for use with No. 4 screw sizes. Molded from Nylon Grade 101 and supplied in an uncoated finish, this spacer provides reliable electrical isolation and mechanical standoff between a PCB and a mounting surface or adjacent board layer. It measures 0.3125 inches overall length, 0.25 inches outside diameter, and 0.116 inches inside diameter. Manufactured to MIL-P-17091B fastener standards, it is suited for applications where dimensional consistency and material compliance are required.

This spacer is used in electronic assembly and circuit board mounting applications across HVAC control boards, electrical enclosures, and industrial panel builds. Its round body and female unthreaded bore accept a No. 4 fastener for straightforward stacking or standoff configurations. Electricians, control board technicians, and electronics assemblers working in both residential and commercial trade environments will find this spacer appropriate for tight-tolerance PCB installations where a compact, lightweight standoff is needed.

Key Features

• MIL-P-17091B compliant construction for consistent dimensional and material standards
• Nylon Grade 101 material provides electrical isolation and corrosion resistance
• Female unthreaded bore sized for No. 4 screw applications
• Overall length of 0.3125 inches with a tight length tolerance of -0.005 to 0.005 inches
• Inside diameter tolerance of 0.000 to 0.010 inches for controlled fit on fastener shanks
• Uncoated finish - no additional coating to affect dimensional stack-up

Compatibility

Designed as a standard No. 4 screw-size round circuit board spacer suitable for PCB standoff and isolation applications in electrical, HVAC, and industrial control panel assemblies where MIL-P-17091B compliance is specified.

Installation Notes

Installation is performed by electricians or electronics technicians during board assembly or panel build. Power down all circuits and discharge any capacitors before working on or near live control boards. Use hand tools appropriate for No. 4 fasteners and avoid overtightening, which can crack or deform the nylon body. Follow applicable NEC guidelines and equipment manufacturer instructions for PCB mounting procedures.