No Weld Chain Break Tool




Introduction: No Weld Chain Break Tool

Chain break tools are used to remove pins from bike,scooter, or motorcycle chains so that they can be resized.

I have seen several videos recently showing people making their own chain break tools. Each one required welding equipment and knowledge. I have neither, so I thought to myself, “I wonder if I can build a chain break tool that requires no welding?”

Challenge accepted. Here are the results.


Materials Needed:

  • Mending plates (2 or 4, depending on thickness)
  • Bolts (3)
  • Lock nuts (2)
  • Jam nut (1)
  • Wing nuts (4)
  • Washer (1)
  • Epoxy


  • Wrench
  • Bench Grinder

Step 1: Make a Push Pin

Thread a jam nut on a bolt. Put the bolt in your drill, head & nut first. While slowly rotating it in your drill, rub the end of the bolt against a spinning grinding stone until you reach the desired thickness. It should be smaller in diameter than the chain pins you will be removing.

Once you’ve reach the desired thickness, slowly back the jam nut off the bolt until it is removed. This will repair the threads where the ground-down part begins.

Finally, epoxy a washer on at the head of the completed push pin.

Step 2: Attach the Guide Nut

Using epoxy, attach a jam nut to one of the middle holes on a mending plate. Make sure it is centered, as this will be what guides the push pin. You can use a bolt to make sure it is lined up properly. Be careful not to get any epoxy in the threads of the nut. Let the epoxy fully cure before continuing.

Step 3: Assembly

Pictures do more than words. Assemble your tool as pictured.

Step 4: Start Breaking!

Align the chain pin directly under the push pin, so that it lines up with the chain pin you want to remove. Adjust the tool depth using the wing nuts as needed. Use a wrench to slowly drive the push pin until it has pushed the chain pin out enough to remove the roller link.

If you’ve never broken a chain before, here’s some advice: Don’t push the chain pin all the way out. You want to leave it attached to the outer link for proper reassembly.

Step 5: Conclusion

I built this for the fun of it and to see if it could be done.

It works, so I’m happy with it. However, my real chain tool works better, so this will be relegated to my junk pile until I need to scavenge the parts for another project.

Thanks for reading.

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    2 years ago

    Funny, the first thing I thought was : "WHY?" You can buy this tools and are not expensive.
    You end the instructable with the answer on my question and when I thought a bit longer about it......
    It works, so it can be a live saver if you don't have a real one at a sunday morning and the stores are closed. Or the stores ar far away, than this can really make your day!
    Nice instructable!


    Reply 10 days ago

    Nice work heres another simple alternative no weld chain breaker

    D shackle chain breaker

    10mm D shackle
    M10 bolt
    Clout or nail

    Cut nail to length and remove tip file flat
    Drill hole in end of bolt to interference fit the nail
    Hammer nail home ensuring not to bend
    Voila Job done
    Use what you have at hand
    P.s. added washer and nut for easy of tool


    Reply 2 years ago

    I guess in all my editing of this 'ble I deleted it, but I had a paragraph in here that said something to the effect of "a proper chain break tool works better and is cheaper. I only built this to see if it would work, and because I had the supplies on hand"
    That being said, I've been going stir crazy with this whole pandemic so it did provide a little entertainment


    Reply 2 years ago

    Ya, one of the reasons I started watching diy chain break vids was because I loaned out my original tool and thought I might need something in a pinch. I ride motorized bikes and I like to carry one and a few extra links in my bag because I've been stranded before on a ride. Thanks for the nice comment.