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Bobbin Case For Singer #31-15, 331K

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Bobbins cases for professionals.

Insert the bobbin into these durable metal bobbin cases. This bobbin case is for Singer models 31-15 and 331K.

Features

  • Fits select machines
  • Metal
  • Anti-backlash spring not included

Product Specifications

Units: Each
Material: Metal

Plastic Bobbins vs. Metal Bobbins

plastic bobbins


Plastic Bobbins

Plastic Bobbins are lightweight and convenient for fast sewing. Plastic bobbins should be used with a bobbin case created for plastic bobbins; be sure to check your sewing machine’s manual to find which material is best suited for your machine. For best results, avoid switching between metal and plastic bobbins to maintain consistent thread tension.

metal bobbins


Metal Bobbins

Metal Bobbins and Cases are durable and long lasting. For best results, a metal bobbin should be used with a metal bobbin case—be sure to check your sewing machine’s manual to find out which bobbin material is best suited for your machine. Avoid switching between plastic and metal bobbins to maintain consistent thread tension.

bobbin styles & sizing

Bobbin Styles & Sizing

There are many different styles of bobbins and bobbin cases in use on sewing machines today, all slightly different in shape, size, and weight. Unfortunately, different classes of sewing machine bobbins are not interchangeable, so be sure to use a bobbin and case in the same class or style as your machine requires. A few common styles of thread bobbins and cases include Class 15, L Style, and M Style. Different sewing machines require different bobbins even within the same brand of sewing machine, so be sure to consult your owner’s manual to know which bobbin is applicable to your machine, or feel free contact us with questions.

Would this bobbin case be suitable for Janome Harmony 2049 home sewing machine? It looks exactly like the one I own, but I'm not really sure if it would work as the original.
Hamlet P.
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A:
I'm showing the BOB8C to be the case that is made for your Janome. This one is similar in size, but the "arm" is shorter.
Joseph D.
  • logologo Staff
What are the dimensions of the case? I have an industrial singer straight stitch from the 40's or 50's. The opening for the bobbin case is 7/8" to 1" wide with a depth of almost 1/2".
LAURA L.
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A:
They are 13/16" x 13/32".
Lisa P.
  • logologo Staff

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