Insert these terminals into tiny openings in terminal blocks and other connection points. They're an alternative to threading and poking wire directly into the opening, which can fray the wire and lead to short circuits. Pin terminals are similar to wire ferrules, but they have a rounded, uniform profile that you can solder to holes in printed circuit boards and other thin surfaces. Attach your wire with a crimping tool to avoid a damaged barrel and loose connection.

The heat-shrink plastic protects your wire from cuts and debris to prevent short circuits, while the pin inserts snugly into the tiny opening of your terminal block or other connection point for a solid hold. In addition to a protective seal, the heat shrink distributes strain when the wire is tugged or under tension for long periods. Use a crimping tool to squeeze the wire evenly into the barrel, where it touches the pin to establish conductivity. Then apply heat to seal the plastic onto the wire from all sides.