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Meaning of ST Thread

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rzhz View Drop Down
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    Posted: 18.Apr.2018 at 07:57
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 Ø5,5 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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philippe JOSEPH View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote philippe JOSEPH Quote  Post ReplyReply Direct Link To This Post Posted: 18.Apr.2018 at 10:37
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 ? 


Edited by philippe JOSEPH - 18.Apr.2018 at 10:38
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philippe JOSEPH View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote philippe JOSEPH Quote  Post ReplyReply Direct Link To This Post 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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rzhz View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rzhz Quote  Post ReplyReply Direct Link To This Post Posted: 18.Apr.2018 at 11:09
I want to know if there is any standard for the abbreviation "ST" for "SelfTapping" :)
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philippe JOSEPH View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote philippe JOSEPH Quote  Post ReplyReply Direct Link To This Post 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. 
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Kent Cooper View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Kent Cooper Quote  Post ReplyReply Direct Link To This Post 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.

Edited by Kent Cooper - 18.Apr.2018 at 19:56
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Post Options Post Options   Thanks (0) Thanks(0)   Quote rzhz Quote  Post ReplyReply Direct Link To This Post 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...
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Post Options Post Options   Thanks (0) Thanks(0)   Quote philippe JOSEPH Quote  Post ReplyReply Direct Link To This Post Posted: 20.Apr.2018 at 14:25
Yes and ISO7049-ST is not a Square Thread.
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