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Types of screw drives section

A note to this article-there's also a rare type of screwdrive (for a reason), whose shape is a triangle. it's called triangle recess, or TP3. 15:03, 28 January 2009 (UTC) —Preceding unsigned comment added by 212.150.245.250 (talk)

There is also a 12-point drive. Commonly used on 4x4 drive shafts. A 12-point socket/wrench fit them.

Carriage bolt, coach bolt and Brunnian's edits

Brunian has made several edits based at least partially on a particular definition of coach bolt.

I was not able to find an internet site that used the same definition as Brunian for coach bolt. The most similar term for what Brunian seems to have intended was coach screw that is defined in places as equivalent to lag screw (lag bolt). Brunian's definition of coach bolt seemed to be equivalent to lag screw (bolt). Unless a source can be found for Brunian's definition of coach bolt his edits with regard to coach bolt should either be removed or edited.

Internet search results with regard to the definition of Coach bolt

(coach bolts and carriage bolts are the same)
http://www.buildeazy.com/glossary/bolt.html

Coach/carriage bolts: are round headed bolts with square shoulders that resist rotation when located or driven into place. They can be called coach bolts or carriage bolts depending on which part of the world you live in. The head end of the bolt does not need a washer, but the other end of the bolt (the nut end) usually does.

(uses term coach bolt to describe what is a carriage bolt in the US)
http://www.screwfix.com/prods/33264/Bolts/Coach-Bolts/Threaded-Coach-Bolts-A4-Stainless-Steel-M8-x-80mm-Pack-of-10
http://www.dealclick.co.uk/product/10908590/Unbranded-Zinc-Coach-Bolt-M12-X-90-With-Nut.php

(defines coach bolt as same as carriage bolt in UK)
http://encarta.msn.com/dictionary_1861687848/coach_bolt.html

U.K. Same as carriage bolt

(uses coach bolt as equivalent to carriage bolt, uses coach screw as equivalent to lag screw)
http://www.fastfixdirect.co.uk/code/navigation.asp?fType=Fasteners&MainCategoryID=6
http://www.interiordezine.com/index.cfm/Interior_Design_Fittings_and_Fixtures/Fixings_2

Davefoc (talk) 16:52, 4 May 2009 (UTC)[reply]

Agreed - thanks for the research Davefoc. Wizard191 (talk) 18:26, 4 May 2009 (UTC)[reply]

I removed the reference to coach bolt from the screw/bolt differentiation section, I changed coach bolt to coach screw in the screw types section and I changed the definition so that it references the lag screw definition. I think this issue is closed unless Brunnian provides documentation for his edits with regard to this. Davefoc (talk) 17:39, 6 May 2009 (UTC)[reply]

Changes to the screws and bolts section

I made the changes for the following reasons: The section was overly specific about what a screw and bolt were: a. some bolts don't have heads designed to be driven. b. some screws don't have heads or at least external heads (set screws). c. threaded fasteners can mate with complementary helixes formed in other ways than tapping.

I realize that the section now repeats some of the opening. This seems a bit awkward and perhaps somebody could improve on the way I did it.

Title of the article Part of the awkwardness is the title of this article. A long time ago I changed the title of the article to Screws and bolts or Screw/bolts. Somebody came through and changed it back without giving a reason. I still think the article should be titled, Screws and bolts. Long before me, this article morphed into an article describing screws and bolts and I don't see why it's not called that. —Preceding unsigned comment added by Davefoc (talkcontribs) 17:06, 6 May 2009 (UTC)[reply]

The impetus for the changes was the change made by 205.179.219.242. I think this is what he had in mind with his parenthetical comment. --Davefoc (talk) 17:42, 6 May 2009 (UTC)[reply]

Self tapping vs. self threading
I left the term, self tapping, in place. Perhaps self threading would be better though. Self tapping is generally applied to screws designed for use with sheet metal and plastic. The machinery's handbook uses the term, self threading for the general class of threaded fasteners that form their own threads as they are driven.

when I worked in manufacturing the standards office made a similar distinction: self tapping as a hardened screw of no particular thread designed for driving into wood or soft metal (sheet metal, lead battery terminals, etc). Self Threading used a defined thread standard, and was frequently shaped like a tap - a short tapered section with a groove to form a cutting edge and then a parallel threaded section without a groove; Self Threaders were only used in metal, and of a suitable thickness to take several threads. The first type was intended not to be removed, the latter was intended for regular removal and refitting, and could be substituted with a standard bolt of the same thread. Air powered tools were invariably used to drive self-threading screws home the first time.
The (separate) wikipedia entry for Self-tapping_screw seems to conflate both types.
It appears that in the USA the term thread cutting screw has been coined for the second type. I've never heard it in the UK or australia (http://boltproducts.thomasnet.com/Category/screws-screw-threads-thread-cutting-screws). It seems a sensible coinage. Brunnian (talk) 10:38, 19 July 2009 (UTC)[reply]

Davefoc (talk) 17:35, 6 May 2009 (UTC)[reply]

Recent delete of this section I notice that somebody deleted the whole section and the delete was reverted. In some ways the delete makes sense, IMHO. Part of this section could be used as an intro at the top of this article, combined with the part that is there now in some way or just deleted. This especially makes sense if the title of the article was changed to "Screws and bolts". Other parts of this section might get their own title like the issue of left and right handedness and the issues of rolled versus cut threads. That part needs some changes anyway because it is misleading to call rolled threads a recent advance. Davefoc (talk) 21:12, 6 May 2009 (UTC)[reply]

Minor edits for clarity. Davefoc (talk) 21:18, 6 May 2009 (UTC)[reply]

Types / differentiation sections

I want to combine the "differentiations" section with the "types of screws and bolt" section. The differentiation section is talking about various types of screws and bolts, so it feel natural to me for it to flow into the various types. Plus the types section has and entry for "screw" and "bolt" that references the "differentiations" section. I think it should be pretty easy segue with something like: "In this article we are going to classify screws into two major categories based on...". Let me know what you think. Wizard191 (talk) 00:32, 23 May 2009 (UTC)[reply]

There is definitely duplication between the 2 sections currently. But I am having trouble envisioning how to merge them. I would say give it a shot if the inspiration strikes. Could hash it out on a subpage first. — ¾-10 02:37, 24 May 2009 (UTC)[reply]
I attempted it in my sandbox and it didn't go very well. It made sense in my head at the time. I think I'm just going to move the "types of screws and bolts" section under the "differentiation" section. Wizard191 (talk) 12:37, 25 May 2009 (UTC)[reply]

change to "Other distinctions" part of the "Differentiation between bolt and screw" section

The citation was removed and a hidden note was added to the source. The note, by wizard191, says that he doubts that the alternative definition for bolt and screw listed in the link exists.

I disagree a bit. Keithonearth believed that this was the distinction in the long discussions about that section. I suspect other people have arrived at a similar idea. It might be the most rational way to define the terms. I used the reference to prove that there is some support for this distinction. The section goes on to explain that the distinction is not one that is consistent with general use or formal specification. I suspect that this may be the only reference to such a distinction on the internet, but given my general sense that at least some people believe that it is correct I thought it was reasonable to discuss it in the article. As such, I thought the section was useful as it stood and didn't need to be changed. --Davefoc (talk) 13:56, 25 May 2009 (UTC)[reply]

What I meant was that I don't think there's an online reference for that definition, but if a source can be found else where I have no problem including the info in the article. I couldn't let the previous reference stand because it wasn't a reliable source. Unfortunately, if a source can't be found it will have to be removed per wp:v. Wizard191 (talk) 18:02, 25 May 2009 (UTC)[reply]

We had this discussion long ago. I was concerned about the use of a questionable source and you suggested that I shouldn't use it. In general, I suspect we have similar ideas about what a reliable source is and for most purposes this kind of source would certainly not qualify as reliable. However, in this case, this source provides a reliable data point that at least somebody holds this view. Some credibility to the idea that these kind of definitions of screw and bolt exist beyond the existence of the data from this web site is that Keithonearth argued strongly for a similar definition. For me the issue is whether the view is held widely enough to justify addressing it in this Wikipedia article. I don't know the answer to that. It seems like a logical view that some people are going to come to on their own and it is reasonable to address it just for that reason, but I don't have a strong feeling about this and maybe the idea is just too obscure to be worth addressing in this article. --Davefoc (talk) 20:51, 25 May 2009 (UTC)[reply]

I put back the citation that was objected to. This kind of citation for this kind of thing seems to be addressed in the link to reliable sources that Wizard191 provided. I also made some minor changes to the screws are small and bolts are big addition to this section. It is difficult if not impossible to provide formal documentation for either idea because nothing formally defines screws and bolts in this way. But these definitions were not presented as formal definitions. They are in the article to discuss the ways that on occasion the terms are used informally.
It is possible that the entire Other distinctions section should be deleted. Certainly if there is a requirement that formal documentation be found for informal usage of the terms screw and bolt that may be necessary. But even without that perhaps this section doesn't add sufficient value to be retained.--Davefoc (talk) 15:37, 2 June 2009 (UTC)[reply]
I posted the source in question to the RS notice board, which is found here: Wikipedia:Reliable sources/Noticeboard#Screw source. According to the reply I've removed the reference. Wizard191 (talk) 22:34, 6 June 2009 (UTC)[reply]
With respect, I think you have not understood my point. The other distinctions part of this section deals with ideas about the distinction that are not formally excepted distinctions but do have some usage. Formal sources are not likely to be available for usage which might be common but which is not formally supported. If this kind of source is not acceptable to document an informal usage then consideration should be given to removing the entire other distinctions part of this section since it will likely not be possible to provide any citations for it. Also with respect, when you posted the issue about reliable sources you failed to present anything representative of what I had to say about the issue. Perhaps most importantly, that I realized for most purposes the use of this kind of source was clearly unacceptable but that in the very limited case of what it was being used for here it might be acceptable. In the article that you linked to this kind of use for this kind of source seemed to be acceptable for exactly the kind of purpose it was used for here. Davefoc (talk) 13:58, 7 June 2009 (UTC)[reply]
If a source can't be found for that section then it should be deleted per WP:V, which states "The threshold for inclusion in Wikipedia is verifiability, not truth". If the information cannot be verified then it cannot be included. I understand that you are just trying to show that other viewpoints exist, but these other viewpoints still have to have a solid foundation. We can't include an entry that says "a screw is any fastener longer than 1 foot and a bolt is anything shorter than 1 foot", just because someone stated it on their tripod website. I realize that the statement in question seems much more plausible, but that doesn't mean it doesn't need to meet the usual reliable sources guidelines. (P.S. In the noticeboard request I gave a link to this talk page, but wasn't going to rehash everything discussed, because there was just too much.) Wizard191 (talk) 22:37, 7 June 2009 (UTC)[reply]
Your points are reasonable Wizard191. Although I think this is a gray area that is not as clear cut as you do. An article about prominent urban myths might reasonably enough link to a site that promoted the idea that Elvis Presley was alive. This is a similar case in that the section is about an idea that is prominent enough that Keithonearth argued for it and that I suspect many people believe. What I was never sure of was whether the view was prominent enough to justify mention, however it is a view that I suspect many people come to at some point that have thought about exactly what the two terms mean. Having said that, I think whatever you do with regard to this will be fine.

Davefoc (talk) 05:30, 8 June 2009 (UTC)[reply]

I fear that the difference between a bolt and a screw may not be defineable. The definition of being able to receive a nut for bolt seems good, but I remember buying machine screws for work that fit the definition of bolt. Perhaps bolts are a subset of screws. Usage may be arbitrary as in motor/engine. --Weetoddid (talk) 22:49, 6 June 2009 (UTC)[reply]


I've added back the "alternative" definition and the link to the Structural Analysis Reference Library. It has every appearance of being a sensible reference work, and the superior usefulness and logic of the definition should tip the balance of any debate in favour of inclusion. There is obviously no descriptive definition for either term that will fit every fastener that has ever been called a screw or a bolt. The ambiguity of the terms is a vicious circle - people called a "machine screw" a screw because an ambiguity existed, and now the ambiguity is entrenched. The "alternative" definition most certainly is not descriptive, in the sense that it doesn't describe how everyone uses the two terms. But it serves as the most useful prescriptive definition - suggesting how the terms should (or at least could) sensibly be used. --MichaelSG

Explanation for reversion of good-faith EL change

One would think that the info would be "surely available through noncommercial sites", but I have actually looked into that and found that the best info on fasteners and tools tends to come from supply houses. I deduced that the reason for this is that the only people with the time and money to make these really great information resources (ie, thousands of pages of brief descriptions with great photos) are the ones whose livelihoods are tied to it. For example, the MSC, McMaster-Carr, and Enco catalogs are collections of information (especially the photos) that would be excellent to have for Wikicommons, but of course it cost them a lot of money to amass this resource and they only give it away to the extent that it leads people to buy from them, which is entirely understandable. Eventually we can get GFDL photos of every type of fastener and tool in the world, but it takes time, which equals money. Here's a toast to continuous improvement and pro bono moonlighting. — ¾-10 23:25, 29 May 2009 (UTC)[reply]

I had a discussion with the reverting editor on his talk page and am in the process of trying to add the info to the article. I've just uploaded SVG versions of the head marking and just need to start on the table. But I have to agree with you that there's a lot of real good info out there at commercial websites (especially McMaster). I know I personally use it on a daily basis for design information at work. Wizard191 (talk) 23:43, 29 May 2009 (UTC)[reply]

What to do with bolted joint?

So I've been working on some of the mechanics of this article, but the sections still need a lot more work. Right now I'm apprehensive to make more drastic changes, because of the bolted joint article, which has some good information, but overlaps some of its content with this article. For instance, both articles have info on bolt strength, proper torquing, and property classes. Now I realize there's going to be a slight overlap on some information, but I think we need to figure out properly split the information. Right now this article is 70 kB, so it's pretty big, but I suppose one option is merging bolted joint into this article. However, right now I'm leaning more on taking the strictly screw information, like property class information, and moving that from bolted joint into this article, and then taking the information about torquing, etc., and moving that to bolted joint. However, I'm definitely open to other ideas. Wizard191 (talk) 01:02, 10 June 2009 (UTC)[reply]

129.97.36.75 's edits about computer controlled torquing

The revisions in question are these:
Wizard191 version:

Large volume users such as auto makers frequently use computer controlled nut drivers. With such machines the computer in effect plots a graph of the torque exerted. Once the torque ceases to rise (the point where the bolt begins to deform) the machine stops. Such machines are often used to fit wheelnuts and will normally tighten all the wheel nuts simultaneously.

129.97.36.75's version:

Large volume users such as auto makers frequently use computer controlled nut drivers. With such machines the computer in effect plots a graph of the torque exerted. Once the torque reaches a set maximum torque chosen by the designer, the machine stops. Such machines are often used to fit wheelnuts and will normally tighten all the wheel nuts simultaneously

I believe that two different ideas have been confounded here. The use of computer controlled tightening machines to achieve the optimal torque by tightening until there is a drop in torque and the use of computer controlled tightening machines to automatically achieve a particular preset torque.

I suspect that lug bolts are torqued until a specific torque is reached and are not torqued to achieve the optimal torque for resistance to unwanted resistance to loosening. I am not sure though and neither editor has provided a citation for their edit.

I believe that some head bolts are torqued using the procedure that Wizard191 mentioned since there are some head bolts which are designed to be used only once.

Either way it seems like the paragraph as it now stands has problems because of a lack of citations and the possible confounding of concepts.
--Davefoc (talk) 20:58, 16 June 2009 (UTC)[reply]

FWIW, I didn't write that paragraph, however I believe you are right DaveFoc. There are two different concepts/procedures being described and they are both probably right. As such, they should both be described. But I think a source needs to be found for each concept first. Wizard191 (talk) 21:38, 16 June 2009 (UTC)[reply]

Unified thread standard

I'm having huge difficulty believing 'At least 85% of the world's fasteners are dimensioned to Unified thread dimensions'. It is certainly contrary to my experience, where ISO metric threads seem to dominate. I've tried to buy UNC fasteners on every continent to repair US made machines, and rarely succeeded immediately outside the USA. Even Canada seems to use more Metric than Unified threads. Brunnian (talk) 14:13, 15 July 2009 (UTC)[reply]

You are quite right. There's no such source as "The World Fastener Review". I think it's some really old sneaky vandalism. Wizard191 (talk) 14:45, 15 July 2009 (UTC)[reply]

Check with the Industrial Fastener Institute (IFI), a very real organization. Joe Greenslade is the director. —Preceding unsigned comment added by 72.72.20.207 (talk) 17:43, 20 January 2010 (UTC)[reply]

Triangular slot?

I've seen screws with a triangular slot, similar to the Robertson head but having an equilateral triangular depression instead of a square hole. I've seen it primarily used in plastic kid's toys, e.g., the kind you get with a McDonald's Happy Meal. Any idea what this head type (or driver type) is called? — Loadmaster (talk) 17:56, 17 July 2009 (UTC)[reply]

See top of this talk page. Ortolan88 (talk) 15:33, 19 July 2009 (UTC)[reply]

Acme Thread

What about the Acme thread, a trapezoidal thread from used for feedscrews, high-torque and self-braking mechanisms? Does it deserve a bit more detail than being stuck with the obsolete threads? —Preceding unsigned comment added by Brunnian (talkcontribs) 21:22, 8 August 2009 (UTC)[reply]

Really there needs to be a small topical section created for leadscrews thread forms, which contains the acme thread form. Wizard191 (talk) 22:57, 9 August 2009 (UTC)[reply]

Acme thread are hardly obsolete. They are commonly found on bench vises and heavy-duty C-clamps.

What does shank mean?

From the opening section:

Some screws have an unthreaded portion of the shaft under the head, which is known as the shank.

In every other place the word shank is use it sounds like it means shaft. For instance:

Fasteners with a non-tapered shank are designed to mate with a nut or to be driven into a tapped hole.

The word shaft was replaced with the word shank throughout the article. That seemed to make sense if shank means shaft with regards to screws. Shank seems like a more specialized fastener type word. But if shank actually means the unthreaded part of the shaft then consideration might be given to modifying at least some of the sentences that use it to mean the whole shaft.

The nail article defines shank as:

the body the length of the nail between the head and the point; may be smooth, or may have rings or spirals for greater holding power

It seems like shank=shaft when it comes to screws. I would like to have confirmed that with a dictionary definition but the definitions I saw didn't cover this issue, at least not unambiguously. What is the source for the definition of shank provided in the opening paragraph? --Davefoc (talk) 10:19, 18 September 2009 (UTC)[reply]

Hey Dave, good to see you back again. I was the one who made the change from "shaft" to "shank". The source for the text in the intro came from: [1]. In my mind I think of the terms shaft and shank interchangeably, but I think you make a good point above. Whenever the text is referring to the body under the screw threads I think it makes sense to call that the "shaft". I would be willing to change those instances back to "shaft". Wizard191 (talk) 14:34, 18 September 2009 (UTC)[reply]
Hi Wizard191, from page 39 of your source:

D. Shank-the cylindrical part of a bolt that extends from the underside of the head to the point.

The drawing above that text ambiguously points to the unthreaded part of the bolt as the shank, but that may not mean that the entire shaft of the bolt isn't the shank. The text seems to make it clear that the entire shaft of the bolt is the shank. This suggests to me that the opening paragraph is wrong when it states otherwise. Davefoc (talk) 15:56, 18 September 2009 (UTC)[reply]
Hrm, you are quite right. I just based the text in the opening paragraph on the photo and never realized there was text that went with it. I will updated the opening paragraph to reflect this. Thanks for you diligence. Wizard191 (talk) 16:31, 18 September 2009 (UTC)[reply]
Good job. I think this issue is closed.

I cannot recall ever seeing 'shaft' used in this manner; 'shank' is the right term. —Preceding unsigned comment added by 72.72.20.207 (talk) 17:43, 20 January 2010 (UTC)[reply]

Darysys October 4, 2009 edits

Darsys, made a number of edits to the Fasteners with a tapered shank (self-threading screws) section: They provided interesting information, however I believe there are some issues with his edits.

(Teks® screw)

I thought adding the ® was a good edit and a reasonable thing to do, so much so that when I put that item in the list I included it originally. Somebody came through and took it out without comment. I didn't know why. I thought if somebody thinks it should be removed again, they might stop by and explain why before they delete it again.

Wizard191 deleted the trademark symbol. He said that it violated Wikipedia standards to use it. He seems to be right: MOS:TRADEMARKS--Davefoc (talk) 08:58, 4 October 2009 (UTC)[reply]
Addition of size information about Teks screws

I thought this was useful information and probably should be retained. However these are not the bad old days of this article (of which I was a participant) when unsourced material was just added willy nilly. At least for new material, sources should be supplied otherwise we are going fall farther behind on proper sourcing for this article.

Asymmetrical threads on particle board screws

I didn't know that particle board screws have asymmetrical threads and that is interesting, but I don't know what asymmetrical threads are. Perhaps a reference to where that is explained would be helpful. And the no source comment applies to this item also.

If you look at cross-section of an individual thread, it is often in the shape of an upside-down V with both sides symmetrical about an imaginary axis that runs from the tip of the thread to the bottom of the profile, like an isosceles triangle. Asymmetrical threads have been optimized for the material the screw is designed for. The cross-section of the threads are not symmetrical: one side is steeper than the other. This configuration may be to reduce installation torque or to maximize the pullout force required to rip the fastener out of the material (as opposed to unscrewing it). —Preceding unsigned comment added by 72.72.20.207 (talk) 17:43, 20 January 2010 (UTC)[reply]

Auger tip for decks screws

Again good information. This is difficult to source because it includes a conclusion that most deck screws have this kind of tip. I'd settle for a couple of cites of prominent manufacturers of deck screws that have auger tips. Also, some link to a place where auger tips are described would be helpful. —Preceding unsigned comment added by Davefoc (talkcontribs) 02:40, 4 October 2009 (UTC)[reply]

Auger point, also called Type 17 point, are indeed common in deck screws because they do not require predrilling. I don't think they are universal as there may be some other proprietary designs, but I can say that the auger point is the one feature that distinguishes deck screws from 'standard' flat-head wood screws (other than the corrosion-resistant coating). Note that there are many other screws that have an auger point. —Preceding unsigned comment added by 72.72.20.207 (talk) 17:43, 20 January 2010 (UTC)[reply]

205.243.112.50 's edit to bolt/screw distinction section

205.243.112.50 changed the opening section so as to directly quote ASME B18.12 as to what the difference between a screw and a bolt is. The previous version quoted the distinction listed in the Machinery's handbook which I believe was derived from ASME B18.12. That seems to be an improvement in that a primary instead of a secondary source is quoted.

However I reverted his change overall, because:

  1. The wording might be improved
  2. It includes the comment that "This definition is distinctly different from that of a screw". I think this is obvious. The difficulty is that the definitions are not mutually exclusive. Some things can be both a screw and a bolt as per the definition. And in common usage some things that are usually referred to as bolts are actually screws based on the ASME B18.12 distinction.
  3. It fails to provide a lead in to the section that follows that discusses in detail some of the issues associated with the distinction of bolts and screws.

I thought that ideas as to possible changes to the section had some merit. Perhaps the paragraph should start out with the ASME B18.12 distinction. It should then follow that up with a sentence that explains that not all fasteners can be unambiguously determined to be a bolt or a screw using the ASME B18.12 distinction.Davefoc (talk) 05:35, 13 October 2009 (UTC)[reply]

I agree with the reversion. By all means, I support good-faith contribution, but looking at 205.243.112.50's edit diff, my first reaction was, essentially, what Davefoc said regarding "fails to provide...". This is just one of those parts of Wikipedia where you really need to read closely everything that's currently there before attempting to improve it, because the amount of exhaustive analysis already poured into it was very large. Best to all, — ¾-10 02:48, 14 October 2009 (UTC)[reply]

"locate objects"?

All that comes to mind is a metal detector or something. That part should be rewritten. -Craig Pemberton 09:52, 12 November 2009 (UTC)[reply]

I think the poster is referring to this sentence in the first paragraph: "Their most common use is to hold objects together or locate objects." I agree with the comment.
It is not clear to me what locate objects is meant to mean.--Davefoc (talk) 16:09, 12 November 2009 (UTC)[reply]
Does this help: [2]? Wizard191 (talk) 17:47, 12 November 2009 (UTC)[reply]
Yes it's better and I thought that was what you meant. But I'm not sure it's useful to have "position objects" in the sentence at all. The distinction between holding objects together and fixing an object into position seems very subtle to me. One can attach a picture to the wall using screws or one can position a picture on the wall using screws. It seems like it's just two different ways of saying the same thing. Maybe I still don't get what you mean by position objects.--Davefoc (talk) 18:30, 12 November 2009 (UTC)[reply]
I'm really referring to things like jack screws, where the screw is used to set a position but it doesn't actually anchor anything. Wizard191 (talk) 18:40, 12 November 2009 (UTC)[reply]

maximal diameter?

The sizing section says: "The numbering system follows a roughly logarithmic series where an increase in each screw number size approximately doubles the tensile strength of the screw and the screw number is found by , where "d" is the nominal diameter." However, I suspect that maximal diameter is meant instead of nominal? —Preceding unsigned comment added by 64.105.21.209 (talk) 04:06, 16 December 2009 (UTC)[reply]

Thanks for the heads up. I've fixed it in the Unified Thread Standard as I'm going to trim up the section here. Wizard191 (talk) 15:35, 16 December 2009 (UTC)[reply]

One-way and Clutch are NOT the same, not even close

I am surprised to see this kind of error on Wikipedia, shown on the screw profiles at the right edge of the article. A one-way screw is as illustrated, a modified slotted recess with ramped edges that prevent removal without a special tool. It is a type of security or tamper-resistant/tamper-proof fastener. A clutch recess, sometimes called a butterfly screw, comes in two basic styles, A and G. Both are 'traditional' recesses in that they are symmetrically formed into the head; installation and removal are equally easy. It is uncommon but not really considered a security fastener. —Preceding unsigned comment added by 72.72.20.207 (talk) 17:43, 20 January 2010 (UTC)[reply]

Quite right; I've corrected the template. Wizard191 (talk) 18:42, 20 January 2010 (UTC)[reply]
That very topic had been bugging me for a while, but I couldn't decide how to address it, because I couldn't think of how to differentiate one-way from clutch within the constraints of the B&W (i.e., nongrayscale) stylized drawings, which is the illustration style used throughout that template. I had visions of a vector graphic with a gradient screen to stylistically represent the sloping contours of the one-way head (not sure if I described that very well—I know what I mean!), but my Adobe Illustrator skills are still too remedial to execute such a slick idea. Anyways, there's always tomorrow … — ¾-10 00:40, 22 January 2010 (UTC)[reply]

Flange bolts?

No mention is made of flange bolts in this article. This would be helpful information. Wakablogger2 (talk) 01:07, 1 March 2010 (UTC)[reply]

I've added a section about flanged heads. Thanks for the heads up. Wizard191 (talk) 16:15, 1 March 2010 (UTC)[reply]
Wow, very nice. Thank you :) Wakablogger2 (talk) 02:06, 2 March 2010 (UTC)[reply]

Taptite screws

User 86.181.159.85 added a description of Taptite screws to the "Fasteners with a tapered shank (self-threading screws)" section.

Taptite seems to be a particular brand of screws. Perhaps there is common usage of the word, taptite for a particular kind of screw, but based on a review of the company's web site it looks like they make a range of screws and the use of the word taptite for a particular kind of screw may not be appropriate here.

There is already an entry for "thread rolling screws" in the "Other threaded fasteners" section. The term, thread rolling screws, may be the generic name for the screws that were described by 86.181.159.85 as taptite. Perhaps the "thread rolling screws" entry should be moved to the "Fasteners with a tapered shank (self-threading screws)" section? The text for the section might be derived from the existing "thread rolling screws" text and the text created by 86.181.159.85.--Davefoc (talk) 18:01, 10 April 2010 (UTC)[reply]

Agreed. I've removed the taptite section and moved the thread rolling section up. Wizard191 (talk) 16:55, 13 April 2010 (UTC)[reply]