Meaning of ST Thread
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URL: https://www.cadforum.cz/forum_en/forum_posts.asp?TID=12702
Printed Date: 08.Jul.2026 at 21:48
Topic: Meaning of ST Thread
Posted By: rzhz
Subject: Meaning of ST Thread
Date Posted: 18.Apr.2018 at 07:57
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Hello everybody, certainly all of you know, that the ST in front of a screw description indicates the thread diameter of the screw, for example: ISO7049-ST5,5x32 So we have a pan head tapping screw with a diameter of Ă5,5 and a length of 32 (data in millimeter). The ST stands for self tapping, right? I can't find any standard or something else, where I can find this information... Somebody knows, where I can find it?
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Replies:
Posted By: philippe JOSEPH
Date Posted: 18.Apr.2018 at 10:37
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Hello rzhz, if you search "ISO 7049" on the internet you will find catalogues for this and it's giving an equivalent towards DIN 7981 C. What is the precision needed, can't you just scale one ?
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Posted By: philippe JOSEPH
Date Posted: 18.Apr.2018 at 10:46
You can try at TRACEPARTS but you will have to check the dimensions for safety.
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Posted By: rzhz
Date Posted: 18.Apr.2018 at 11:09
| I want to know if there is any standard for the abbreviation "ST" for "SelfTapping" :) |
Posted By: philippe JOSEPH
Date Posted: 18.Apr.2018 at 14:14
| OK rzhz I don't have access to the norms ISO 7049 ( DIN 7981 ) but from what I see at any screw seller it looks like ST is OK for Self Tapping and the callout that you use : ISO7049-ST5,5x32 seems perfectly correct, kein Problem. |
Posted By: Kent Cooper
Date Posted: 18.Apr.2018 at 19:53
| I think it may stand for Square Thread, as opposed to Acme or Unified or other profiles, e.g. at https://en.wikipedia.org/wiki/Square_thread_form. |
Posted By: rzhz
Date Posted: 20.Apr.2018 at 13:29
| Hmmm, I'm not quite sure if this is right. The thread of ST screws is sharp, the one you've found is quadratic... |
Posted By: philippe JOSEPH
Date Posted: 20.Apr.2018 at 14:25
| Yes and ISO7049-ST is not a Square Thread. |