First post in this stack but curious on if there is a 'right' answer (within Australian or ISO standard) for how to quantify numerous holes of same size/properties on a drawing. In the past I've seen (assuming 4-holes of 8mm diameter)

  • Ø8 4 Places
  • Ø8 4-OFF
  • Ø8 x4
  • Ø8 (4)
  • 4 x Ø8

Looking at AS 1100.101 (Technical Drawings) it seems to show the last option; enter image description here

However, looking AS 1100.201 (Mechanical Engineering) I'm unable to find industry specific confirmation. (at a glance)

What I really want to know, is what do most of you consider 'best practice'. Or what is commonly used in the industry seeing as the standards have not been updated since 1992. If from country other than Australia, please note where you're 'best practice' is considered.

  • $\begingroup$ All the odd ones you mentioned seem fine. Even ones seem to be a bit more ambiguous. $\endgroup$
    – Abel
    Sep 21, 2023 at 1:27
  • $\begingroup$ Have you checked any of the Engineering Drawing books? many exist and all cover this type of information... $\endgroup$
    – Solar Mike
    Sep 21, 2023 at 5:52
  • $\begingroup$ 4x is the right way to do it in ISO. $\endgroup$
    – joojaa
    Sep 21, 2023 at 15:25
  • $\begingroup$ I have seen most of these in practice (in drawing books and circulated product drawings) as Abel and Mike mentioned. $\endgroup$
    – Kuhrta
    Sep 27, 2023 at 2:58
  • $\begingroup$ Thanks Joojaa, great to hear confirmation from specific standards. This is exactly what i'm after. $\endgroup$
    – Kuhrta
    Sep 27, 2023 at 2:58

1 Answer 1


I was always taught 4x Ø8. If you leave the quanitity at the end you leave yourself open to ambiguity when specifying other properties of the hole. Metric thread pitches can reach 6mm on the very large end, so you could have an M64 threaded hole but then to say you want four, "M64 x4" could mean the fine thread pitch also. Even if you never go anywhere near the large end of the scale, we standardise for reasons like this.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.