4 Things to Know About SJTW Extension Cords

SJTW cords are built for outdoor use The “W” stands for weather-resistant, meaning the cord handles UV, moisture, and cold without cracking.

The letters break down simply S means service cord, J means junior gauge, T means thermoplastic insulation, and W means weather-resistant. Without the W, the cord is indoor only.

Indoor cords fail outdoors Cheap indoor cords get brittle and crack in weather, causing shorts. SJTW cords cost $5–10 more but last years instead of months.

Buy SJTW for any outdoor job Use them for string lights in rain, power tools on damp sites, or storage in an unheated garage. They handle abuse that indoor cords cannot.