[St...] Posted November 20, 2025 Share Posted November 20, 2025 Looking for an answer to the following question. I have never seen the ST before on a True Position callout. What is it referring to? Link to comment https://qualityforum.zeiss.com/topic/25167-gdt-question/ Share on other sites More sharing options...
[To...] Posted November 20, 2025 Share Posted November 20, 2025 according to a chart I have, it means statistical tolerance. Link to comment https://qualityforum.zeiss.com/topic/25167-gdt-question/#findComment-142389 Share on other sites More sharing options...
[Ky...] Posted November 20, 2025 Share Posted November 20, 2025 Part of me feels a bit... weird... sending you to a different forum, but this is probably the best information I found in my, admittedly short time searching. On the other hand, it is odd that they would put the FRTZF of that callout having a larger tolerance than the PLTZF. Don't know if that really makes sense.... Link to comment https://qualityforum.zeiss.com/topic/25167-gdt-question/#findComment-142423 Share on other sites More sharing options...
[Pa...] Posted November 22, 2025 Share Posted November 22, 2025 Please sign in to view this quote. I'm very familiar with ASME; almost not at all with ISO. According to ASME the FRTZF must have a smaller tolerance because you're right. It doesn't make sense to say that a refinement has more variability than the initial tolerance... Never worked with a statistical tolerance. I've just never worked in one of those shops. Link to comment https://qualityforum.zeiss.com/topic/25167-gdt-question/#findComment-142505 Share on other sites More sharing options...
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