12 Gauge Extension Cords

A 12-gauge extension cord delivers dependable power for everyday jobs and high-demand environments alike. Built with thicker copper wiring, these cords are ideal for running tools, appliances, outdoor equipm...

A 12-gauge extension cord delivers dependable power for everyday jobs and high-demand environments alike. Built with thicker copper wiring, these cords are ideal for running tools, appliances, outdoor equipment, and anything else that needs steady current. Each 12ga extension cord from Maximm balances flexibility and strength, offering better heat resistance and lower voltage drop over longer runs than lighter gauges. Maximm's lineup offers both 12/3 extension cord and 12/4 extension cord formats to suit a variety of indoor and outdoor applications. Choose from multiple lengths and outlet configurations, including 3-prong grounded plugs and multi-outlet designs. Every extension cord with 12-gauge thickness in this collection is built with heavy-duty insulation and ETL certification to support safe, consistent performance across all types of projects.

show more

    Built to Last, Ready for Heavy Loads

    A 12-g extension cord is a reliable choice when durability and output matter. These cords are built to carry more current than typical household cables, making them a solid choice for shop vacs, lawn equipment, power saws, and other demanding tools. The thicker wire inside a 12/3 extension cord or 12/4 extension cord helps reduce resistance and keeps things running cooler, even under load.

    Maximm offers heavy-duty 12-gauge extension cord options that work indoors or out. Weather-resistant SJTW jackets protect against UV rays, moisture, and physical wear, while molded strain relief at the plug points increases durability. Whether you're powering a garden project or managing temporary setups at a job site, these cords can handle the environment without breaking down.

    Multi-outlet versions allow users to connect multiple tools or devices at once without overloading a single line. Short lengths like 3 or 6 feet are ideal for tight spaces or clean cable runs, while longer 25 or 50-foot cords give you the freedom to reach across garages, basements, or outdoor areas. Every 12ga extension cord is designed to deliver high power without compromise.

    Trusted by Pros, Backed by Maximm Quality

    Maximm’s extension cord 12-gauge selection is built with quality, safety, and usability in mind. Professionals choose these cords for their reliability on-site, and homeowners value their rugged build for seasonal or routine tasks. With UL and ETL listings, you're getting cords that meet national safety standards, important for any high-current job.

    Choose a 12/3 extension cord with grounded three-prong outlets or go with a lighter 12/4 extension cord when more outlets are needed. All cords are color-coded and labeled for easy organization in toolboxes, trucks, or storage bins.

    Browse the full Maximm collection to find the right 12-g extension cord for your task. Our cords are available in multiple lengths, with fast U.S. shipping and bulk discounts available. Power your next project with confidence and get the durability you expect from a leader in cable manufacturing.