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Thread Gauges

- Jul 13, 2018 -

Yarns are measured by the density of the yarn, which is described by various units of textile measurement relating to a standardized length per weight. These units do not directly correspond to thread diameter.

Wt and Gunze count[edit]

The most common weight system specifies the length of the thread in kilometres required to weigh 1 kilogram. Therefore, a greater weight number (indicated in the American standard by the abbreviation wt) indicates a thinner, finer thread. The American standard of thread weight was adopted from the Gunze Count standard of Japan which uses two numbers separated by a forward slash. The first number corresponds to the wt number of the thread and the second number indicates how many strands of fiber were used to compose the finished thread. It is common to wrap three strands of the same weight to make one thread, though this is not a formal requirement in the US standard (which is therefore less informative).

Thread Weight Table

WeightGunze CountCommon Use[2]
Light60 wt#60/3bobbin or appliqué
Thin50 wt#50/3bobbin or appliqué
Regular40 wt#40/3Quilting
Upholstery30 wt#30/3Decorative
Heavy20 wt#20/3Decorative