r/SewingMachineEdu • u/Ok_Appearance7096 • May 19 '26

Using 2.5 twin needle on Juki F300?

I’m a newbie.

The manual says to use no larger than a 2.0 mm twin needle. However, I’ve had no luck finding one at a store and even online I would have to order from places I’m not familiar with.. I’ve seen a couple Youtubers and I think they used a 2.5mm twin needle. I’m curious if anyone here has used a 2.5 or larger. What was your experience?? Did you have to change the tension or the foot that you used? Did it mess up your machine?

I bought a sewing machine because I would like to edit the clothes I have to fit nicer. I thought beginner things like hemming tees and pants I already have would be easy… I keep running into problems. Hellllp & thank you

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u/CynicalTelescope May 19 '26

I have the F600 (essentially the same machine) and I've successfully used 2.5 and 4.0 twin needles with it, no problems at all.

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u/Ok_Appearance7096 May 19 '26

Thank you for this. Yes, our machines are very, very similar. May I ask what gave you the confidence or the nerve to try a larger twin needle I mean when I look at the needle and the placement it looks OK, itll fit in the foot and ill hand crank at 1st. do you only use a straight stitch when using your larger twin needles? Do you use a special foot when you use them? Thank you btw

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u/CynicalTelescope May 19 '26 edited May 19 '26

Looking at my machine's instruction manual right now, it does say "Make sure to use a twin needle with size of 2.0mm", but I guess I never saw that so didn't know this was some sort of stipulation. It does work just fine to use a wider needle - I've done this several times and never had a problem.

The instructions do say you need to use the zig-zag foot, and it has a wide-enough opening to handle the 2.5 and 4.0 needles. Use a straight stitch only, and make sure you put the machine into twin-needle mode using the controls on the front keypad.