Need to Register?

mrobsessed · October 13th, 2007

I am a little confused by the 't' value used to describe the fineness of screen mesh - does this value simply describe the number of threads per inch? For example does a 43t mesh have 43 threads per inch?

I have also read that there are different ways of measuring the screen size between the US and UK - if so how do you convert?

I read one post that seemed to suggest that 43t (for example) meant 43 threads per centimetre which would be the equivalent of about 108 threads per inch. Is that right? Which system is used in which country?

I have looked at the posts about mesh values but have not been able to find answers to these questions - any help would be gratefully received!

Mr O

Solmu · October 13th, 2007

Quote:

Originally Posted by mrobsessed


	I read one post that seemed to suggest that 43t (for example) meant 43 threads per centimetre* which would be the equivalent of about 108 threads per inch. Is that right?*

Yes, 43T = metric = 43 threads per centimetre = approximately 109 lines per inch

Quote:

Originally Posted by mrobsessed


	Which system is used in which country?

The Imperial system is used in the US, Myanmar and Liberia. The metric system is used in the rest of the world.

Here's a conversion table I was working on:

US to Metric mesh count conversion
US count / Metric count
- 10T
38 15T
61 24T
86 34T
110 43T
125 49T
140 55T
158 62T
180 -
196 77T
230 90T
255 100T
280 110T
305 120T
355 140T
380 150T

Obviously it's a simple matter to convert one measurement to the other, but I've tried to list only actual available mesh counts.

mrobsessed · October 13th, 2007

Thanks a lot Solmu - that's exactly what I needed!

RichardGreaves · October 15th, 2007

The T is the Swiss method of telling you the thread diameter of your mesh. Usually, mills make mesh in 3 thicknesses with 3 thread diameters.

I don't like the letter method.

As you found out, you don't really know much about a mesh when it's called 120 T.

S = small thread diameter
T = medium thread diameter
HD = heavy thread diameter

Italian, Japanese and French don't all use the same letters so that only adds to the confusion.

I want you to use the thread diameter in microns so when you choose 120-31, or 120-34 or 120-40, you will know exactly what you are buying.