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Internet # 312648342

Model # 4147349

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7 ft. High Extension Spring Conversion Kit

$32.88
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  • For use on residential garage doors
  • Easy replacement allows hassle-free setup
  • Quick an easy installation
  • View More Details

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Product Details

About This Product

Clopay's Extension spring conversion kit is for a 7 ft. high garage door. Includes pulleys, cables, fasteners. Does not include springs.

Highlights

  • Replacement OEM part
  • Does not include springs
  • Quick and easy replacement
  • Includes 1-unit per package
  • Return Policy

Product Information

Internet # 312648342

Model # 4147349

Specifications

Product Width (in.): 6.5 in

Dimensions

Product Width (in.)

6.5 in

Details

Garage Door Part/Accessory Type

Garage Door Conversion Kit

Returnable

90-Day

Warranty / Certifications

Manufacturer Warranty

N/A

Questions & Answers

What is the length of the lift cables? How is the 7 foot different from the 8 foot kit?
ByAug 6, 2026
1 Answer | 
Answer This Question

Hi Andy, the 8' kit cables are longer than the 7' kit cables. Otherwise it is the same kit. Thanks for shopping the Home Depot, the Clopay team.

By|Aug 31, 2026


    I have a 14 x 7' insulated door with steel on both sides. I estimate this door to be approximately 200lbs. It currently has a dual spring configuration on each rail. I want to convert it to a single spring configuration. What do I need to buy?
    ByJun 29, 2026
    1 Answer | 
    Answer This Question

    Alan, we would recommend you contact us at 1-877-526-2050 to review this specific situation to ensure we are able to provide accurate information. Please have your door model / size available for this discussion. Thanks for shopping The Home Depot, The Clopay Team

    By|Jul 9, 2026


      Will this kit work on Amarr Garage Doors?
      ByAug 5, 2025
      1 Answer | 
      Answer This Question

      Hi Bart, The kit is designed for Clopay brand doors but should be universal and work on Amarr as well. Thanks for shopping the Home Depot, the Clopay team

      By|Aug 6, 2025


        The picture of what is included shows two sets of cables, the safety cable and the lift cable. Does it indeed come with both of these? One of the questions from 2021 is answered in a way that makes it sound like it does not come with both. Thanks.
        ByJul 2, 2025
        1 Answer | 
        Answer This Question

        CAST, yes this kit comes with both lift and safety cables. We will look into the 2021 answer and remove if inaccurate. Thanks for shopping The Home Depot, The Clopay Team

        By|Jul 8, 2025


          Is this a rebuild kit for an existing extension spring setup?
          ByDec 21, 2024
          2 Answers | 
          Answer This Question

          This kit is a conversion kit for a 7 ft. high garage door and includes pulleys, cables, and fasteners. It does *not* include springs.

          By|Jan 30, 2025

          Hi Leonard, Yes this kit will replace the existing extension spring hardware. Thanks for shopping the Home Depot, the Clopay team

          By|Nov 12, 2025

            (1)

            The listed instructions and assembly links do not show how to install the extension springs and pulleys. Why?
            ByNov 5, 2024
            2 Answers | 
            Answer This Question

            Once you buy the springs, the instructions are going to be with the springs. Cheers!

            By|Feb 18, 2025

              cwalker06, I'm not sure why we don't have instructions. Please contact your local HD store and have them contact Clopay's customer services team. Thank you for shopping The Home Depot, the Clopay team.

              By|Dec 6, 2024


                What gauge or thickness are the cables and how long are they? Your description is lacking tons of information and there is conflicting information about whether or not this kit includes the safety cables.
                ByFeb 28, 2023
                1 Answer | 
                Answer This Question

                Hi Timber, this kit includes cables that are 1/8" in dia. and are long enough for any door 7' high or less. The kit includes safety cables (1/8" dia) and the sheaves (pulleys) are 3" . Thanks for shopping the Home Depot, the Clopay team

                By|Mar 8, 2023


                  Does this work for the 16 ft x 7 ft garage door?
                  ByFeb 16, 2023
                  1 Answer | 
                  Answer This Question

                  Hi Gary, Theoretically this will work but you will need the proper extension springs for weight of your existing door. Most 16x7 doors use torsion springs for better operation. Thanks for shopping the Home Depot, the Clopay team

                  By|Feb 17, 2023


                    Viewing 1-8 of 13

                    Customer Reviews

                    4.8 out of 5

                    • 4.8 out of 48 reviews
                    • 100% recommend this product
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                    Showing 1-10 of 48 reviews
                    This customer chose to rate the product and not provide text.
                    by
                    • Verified Purchase
                    Have not used them yet adding a new ceiling in the garage but they look great just what I need.
                    by
                    This customer chose to rate the product and not provide text.
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                    • Verified Purchase
                    This customer chose to rate the product and not provide text.
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                    • Verified Purchase
                    Product worked very well to convert my garage door opening system
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                    • Verified Purchase
                    This customer chose to rate the product and not provide text.
                    by
                    • Verified Purchase
                    decent value for thick cables, the slide-end-bracket easy to adjust after install without tools (better than wire-clamps).
                    decent value for thick cables, the slide-end-bracket easy to adjust after install without tools (better than wire-clamps). One thing was not clear before install, this kit does include spring safety cables, but you might want a screw carabiner or something to secure the ends, and it might not be optimal to run the safety through the outboard-eyelet on the spring-pulley.
                    by
                      1 found this review helpful
                      This customer chose to rate the product and not provide text.
                      by
                      I was diy’ing my garage springs and I decided to change out the pulley's and all the screws, brackets and eye hooks. Kit arrived quickly and in good order.
                      by
                      • Verified Purchase
                      It was what I needed - got package quickly - people were courteous and knew what they were doing. Thanks.
                      by
                      • Verified Purchase
                      Showing 1-10 of 48 reviews

                      Compare Key Features

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                      Product Snapshot

                      Great for homeowners looking for a conversion kit, making garage door repair easier.
                      Ideal for replacing broken springs on 7 ft. double car garage doors, ensuring smooth operation.
                      Ideal for replacing broken springs on 7 ft. high single car garage doors, ensuring smooth operation.
                      Ideal for double car doors, this EZ-Set torsion spring kit ensures quick and easy replacement.

                      Insulation Capability

                      Weather Resistance

                      Security Features

                      Automatic Close Functionality

                      Smart Home Compatibility