Friday, February 3, 2012

Thread Sizes Explained

A few readers had asked me about thread sizes and the appropriate needle to use. I found this information on the web and post it here for your info.


Size 33 is a lightweight thread typically used for sewing garments. It is stronger than comparable polyester and cotton threads. Stitching, with a size 12 or 14 needle, is unobtrusive.
Size 46 is a lightweight thread typically used for sewing leather, lightweight upholstery fabric and drapes, canvass, and vinyl. It is sometimes used for sewing heavy duty garments because it is twice as strong as comparable spun polyester and cotton threads. Stitching, with a size 14 or 16 needle, is not highly visible.
Size 69 is a light-middleweight thread typically used for sewing leather, lightweight upholstery fabric, canvass, vinyl, awnings, banners, flags, patio furniture, sails and tents. Stitching, with a size 16 or 18 needle, is noticeable.  **It is the largest size that most home sewing machines can handle.
Size 92 is a middleweight thread used for sewing leather, heavy upholstery fabric, drapes, canvass, auto interiors, awnings, boat covers, banners, flags, patio furniture, sails and tents. Use a size 18 or 20 needle.**This size thread normally requires a commercial sewing machine.
Size 138 is a heavy-middleweight thread typically used for sewing leather, heavy upholstery fabric, drapes, canvass, seatbelts, auto interiors, awnings, boat covers, pool covers, banners, flags, patio furniture, sails and tents. Stitching, with a size 20 or 22 needle, is noticeable. **Requires a commercial sewing machine.
Size 207 is a heavyweight thread typically used for sewing heavy-duty leather, upholstery fabric, canvass, and auto interiors. Stitching, with a size 22 or 24 needle, is very visible
Size 277 is a heavyweight thread typically used for sewing heavy-duty leather, upholstery fabric, canvass, and auto interiors. Stitching, with a size 24 or 26 needle, is very visible.
Size 346 is a heavyweight thread typically used for sewing very thick leather, upholstery fabric, canvass, and auto interiors. Stitching, with a size 26 or 28 needle, is very visible and often used as a focal point.
Size 554 is an ultra heavyweight thread typically used for sewing heavy-duty leather, shoe repair, canvass, and auto interiors. Stitching, with a size 30 or 32 needle, is very visible and often becomes a focal point.

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