Size

Commercial 23 33 46 69 92 138 207 277 346 415 554
Tex 23 30 45 70 90 135 210 270 350 410 600
Government A AA B E F FF 3 Cord 4 Cord 5 Cord 6 Cord 8 Cord
Elongation 26% 26% 26% 26% 26% 26% 26% 26% 26% 26% 26%
U.S.
Yards per pound (in thousands) 21.0 12.2 9.5 6.0 4.5 3.0 2.1 1.5 1.3 1.0 0.6
Tensile strength (in pounds) 2 3.0 7.0 11.0 14.5 21.0 31.0 44.0 53.0 73.0 98.0
Diameter (in inches) .006 .007 .008 .011 .012 .015 .019 .023 .026 .028 .033
Metric
Kilometers per kilo 42.3 24.8 19.2 12.1 9.1 6.0 4.2 3.0 2.6 2.0 1.3
Tensile strength (Kilos) 0.9 1.4 3.2 5.0 6.6 9.5 14.1 29.0 24.9 33.1 44.5
Diameter
(Millimeters) .150 .178 .203 .272 .315 .386 .472 .587 .655 .719 .838

that may help some others out too

Allen,
Thank you very much for your post delineating the various thread sizes. I've a long way to go in learning weaving techniques, but this may help me guess how big the finished weave will be.

yup like this you know the diameter (divide 1mm by that number) you know how many threads simple math

You might want to note that your list is missing the common D size. D is about a TEX 60.
There is some variation by manufacturer. D from one can be thicker or thinner than another, for example. Stretch and strength can differ, as can number of cords in a given sizing. And some are parallel fiber, rather than twisted.
If anyone is using the thread diameter for calculations with any doubt, you'd do well to measure it. Wrap about 10mm worth, measure that with calipers for accuracy, and divide by the number of rotations. Part of this is that even a 'known' diameter can change when laid down and tensioned. Some threads flatten when wrapped on something, and tension can of course reduce diameter thru stretch

if you read it right ( no offense ) youll see it is for embroidery threads not regular rod building thread the calculations are only for "reference"not for exacting measurements the gudebrod "D" 0.104" would be around about a tex 65 but for rough calcuations and seeing if something "fits you would use it as a tex 70 obviously the stretch would not be 26% if you were to use rod threads not polys

Allen

I was talking embroidery threads as well. 50 and 60 are fairly common. And they can lay at a different 'diameter' and have quite different compositions.
I am contemplating c-lon, btw. Beaders like it. It is available in AA and D, fair selection of colors, and is a bonded monofilament nylon that is UV resistant. There are quite a few embroidery polys out there as well. The poly's are UV resistant as a group, so far as I can tell. Some of the monocord (continuous filament) ones look interesting in 40 and 50 wt.

Personally I am looking because all the rod threads seem to be UV problematic (nylon generally is). The finishes also seem to UV transparent. After 3 years, the black wraps on my black blank became noticably lighter than the blank. Not so bad overall, but I tend to have to replace a guide or two a year, and the new wrap sticks out like a sore thumb in comparison. If I'm going through the trouble, I want it right as I can get it..

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take a look there and DL there free version LOL