Talk:ISO metric screw thread

message: I recently added specific references where applicable.  when I tried to add the references template to the References section it did not appear.  I've never had this problem before.  Will someone please troubleshoot my work? Stephen Charles Thompson (talk) 03:21, 28 December 2008 (UTC)
thread_title:  References 

message: May I know where to get the international standard for M0.8 pitch, major diameter, pitch diameter and minor diameter specification?
:I don't know whether there is an ISO standard pitch for M0.8 (the pitch diameter and minor diameter are already standardized as a function of the pitch and major diameter by the formulas given in the article). The classic tables (ISO 261, ISO 262) all start at M1. You might want to ask ISO. Markus Kuhn (talk) 16:04, 16 August 2008 (UTC)
thread_title:  M0.8 

message: The added table columns on hexagonal bolt heads seem off-topic. This article is about screw threads, which are used on many other products than hexagonal nuts and bolts. This information, which isn't covered in the referenced screw-thread standards, could be moved to the articles on screw or bolted joint, and should have references to the relevant source standards. Markus Kuhn (talk) 10:56, 9 April 2009 (UTC)
thread_title:  Bolt heads are off-topic 

message: due to physic's methods the pitch should be expresed in mm/spin units  —Preceding unsigned comment added by 190.38.150.30 (talk) 18:03, 10 July 2009 (UTC)
replies: text: I disagree. "Spin" or "rotation" is a dimensionless quantity here, i.e. its unit is "1". The referenced standards specify the pitch of the threads using the unit millimetre. Markus Kuhn (talk) 12:07, 13 July 2009 (UTC)
thread_title:  the pitch is physically wrong 

message: Should not the calculation for H be  P/2 * sin(60)?  
Also there is no mention of the concepts: root radius, root truncation, crown truncation,
lead flank, trailing flank, lead angle,  --71.38.172.8 (talk) 16:11, 1 February 2010 (UTC)
replies: text: Nope, it's right. I've changed it to cos(30) just to match the ref, but it give the exact same value. As for your other points, please add the information if so inclined. Wizard191 (talk) 19:07, 1 February 2010 (UTC)
replies: text: I went through the geometry, and I have H = \frac{P}{2} \cdot \frac{1}{\tan{ \frac{\pi}{6} }}. Incidentally, this is the same as H = \frac{ \sqrt{3} }{2} \cdot P. Mathfreak11235 (talk) 17:11, 17 December 2012 (UTC)

text: I agree with Mathfreak11235. Since you are using H and P, and also a half of the thread angle \frac{60^\circ}{2}=30^\circ, I believe that the relationship between H and P should be described as follows \tan(30^\circ)=\frac{P}{2H}. This expression is valid for any thread angle.  — Preceding unsigned comment added by 148.202.58.146 (talk) 22:13, 7 June 2016 (UTC)
thread_title:  H calculation 

message: ISO 261
http://scholar.google.com/scholar?as_q=ISO+261&num=10&btnG=Search+Scholar&as_epq=&as_oq=&as_eq=&as_occt=title&as_sauthors=&as_publication=&as_ylo=&as_yhi=&as_allsubj=all&hl=en
--222.64.17.90 (talk) 01:49, 31 July 2009 (UTC)
replies: text: What is going on here? No one can read your mind, so please detail the above in a more readable manner please. Wizard191 (talk) 14:35, 31 July 2009 (UTC)
thread_title:  No formaly published academic review on..... 

message: Japan has a metric thread series that is not-quite-ISO, made in accordance with Japanese Industrial Standard (JIS).  I encountered them during an engineering job where a U.S. firm had their manufacturing performed by a Japanese company.  Standard ISO metric screws and nuts will interchange with JIS metric screws and nuts, but due to tolerance differences, they cannot be torqued to full specification when mixed.  True ISO metric screws are more likely to strip the threads out of tapped JIS metric holes.  It may be worth pointing out, but not belaboring, in the article.—QuicksilverT @ 01:23, 19 May 2010 (UTC)
thread_title:  Japanese threads 

message: It would be clearer if the set of equations started with Dmaj = D(nominal diameter) if that is the relation
The text talks of tolerance classes h and g but these are not mentioned in the reference text (ISO 965-1).
This uses d and d2 which are not mentioned on this page I think are Dmaj and Dp. some consistency would be useful even where it does not exist in the standards.
The notation M8x1.25 is more commonly used to indicate the length of the bold 
e.g. M8x60 would be am M8(coarse) bolt 30mm long  —Preceding unsigned comment added by 80.229.216.245 (talk) 09:13, 30 April 2011 (UTC)
thread_title:  Notation 

message: So either the diagram needs to be changed, or the text changed, or the one half needs to be put in some how.  — Preceding unsigned comment added by Mtanquary (talk • contribs) 21:48, 11 June 2017 (UTC)
thread_title:  Issue - the diagram of the threads has a dimension from the center axis to the farthest distance, a radius, but refers to diameter in the text, and uses the symbol upper case D. 

message: I visited this page hoping to find recommended tap drill sizes for ISO metric threads - it does seem a reasonable thing to include, either in "Preferred sizes" or, more probably, "Wrench sizes", which might become "Wrench and tap sizes".  As an electronic, rather than a mechanical, engineer I should prefer to leave the edit to someone more expert, but probably could do it if asked. JMBryant (talk) 17:17, 13 September 2017 (UTC)
replies: text: Good luck. The editors want you (and everyone else) to use those equations and manually derive from first principles that kind of information - presumably because it's not 'encyclopaedic' or some such nonsense. Polymath uk (talk) 15:26, 24 January 2023 (UTC)
replies: text: Perhaps some information could be ported from the Swedish version of this page. It contains a short paragraph on when you want to vary hole diameter from the recommendation and a simple table: https://sv.wikipedia.org/wiki/M-g%C3%A4nga#Borrdiametrar 85.227.199.13 (talk) 19:12, 7 May 2023 (UTC)
thread_title:  Tap drills 

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thread_title:  External links modified 

message: :"A metric ISO screw thread is designated by the letter M followed by the value of the nominal diameter D (the ideal maximum thread diameter for external thread or the ideal minimum diameter for internal one) "
Surely an M8 internal thread (nut) should match an M8 external thread (bolt) - using the description above the matching bolt for an M8 bolt would be 8-thread height - eg M7 .. this isn't right ..5.198.10.236 (talk) 16:22, 18 February 2019 (UTC)
replies: text: But that works out. The inner thread needs to fit inside the outer thread, so the maximum size of the external (inner) thread should be strictly smaller than the minimum size of the internal (outer) thread, otherwise it wouldn't fit inside. They both have a nominal diameter 8 mm, but they approach the 8 mm from different sides. Neither should surpass that limit from either side. The nominal diameter and major diameter are indeed the same, this doesn't contradict anything about the acceptable tolerance of that diameter. Digital Brains (talk) 17:05, 18 February 2019 (UTC)

text: I happen to be re-reading this, and I spot an oddity in the description. Something is either the ideal dimension, or the minimum dimension. The latter refers to tolerance and thus is inherently speaking about non-ideal situations. I'm removing the word ideal in the text, since it seems misplaced. Yes, the 8 mm for M8 internal thread is the ideal diameter, and it is the minimum diameter. But it is either-or, not both at the same time. Digital Brains (talk) 20:07, 8 April 2019 (UTC)
thread_title: Contradiction - nominal diameter 

message: I removed the paragraph below due to the failed verification tag. It also lacks clarity. 
--Srleffler (talk) 16:59, 16 April 2022 (UTC)
thread_title:  Failed verification 

message: An important part of this article matches word-for-word some content which is claimed as copyright at Engineer's Edge.  I can't figure out which is copied from which.  It would seem odd that text would be copied from Wikipedia and then claimed as copyright.  The Wikipedia text evolved somewhat between about 2008 and 2010.  Lithopsian (talk) 18:12, 24 January 2023 (UTC)
thread_title:  Which came first?