Screw Insulators/Shoulder Washers

Screw insulators or shoulder washers, as they are commonly known, isolate and guide metal fixing screws through PCBs. ...The screw insulators also offer mechanical protection and act as spacers between the PCB surface and screw heads. Other uses include the mounting of semiconductors and electrical components that have live cases or tabs. Screw insulators are made from strong corrosion resistant nylon 6/6 and are available in natural and black.