Scotchlok™ 558 Self-Stripping Electrical Tap Connectors are used to electrically connect a (tap) wire end to a through (run) wire and insulate the connection. They are suitable for use with 22-16 AWG solid or stranded copper conductors.
The Scotchlok 558 is a self‑stripping electrical tap connector designed to join a tap wire to a through wire without stripping the insulation. It supports 22‑16 AWG solid or stranded copper conductors and is suitable for common thermoplastic insulated wires.
The sheet lists construction details (tin‑plated brass U‑contact, flame‑retardant polypropylene insulator, red color), weight, recommended installation tools, wiring current limits, voltage and temperature ratings, and UL/CSA certifications. Installation instructions and safety warnings are also included.
| Wire range | 22‑16 AWG solid or stranded copper |
|---|---|
| Maximum current (22 AWG) | 3 A |
| Maximum current (20 AWG) | 4 A |
| Maximum current (18 AWG) | 7 A |
| Maximum current (16 AWG) | 10 A |
| U‑contact material | Tin‑plated brass, 0.02 in thick |
| Insulator material | Flame‑retardant polypropylene |
| Color | Red |
| Weight | 0.0033 lb (1.50 g) |
| Voltage rating | 600 V (1000 V for building wire) |
| Operating temperature | Up to 105 °C |
Use the 3M™ Crimping Tool No. E‑9BM together with 9″ Linemans pliers.
The maximum recommended current for 16 AWG is 10 A.