×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Screw Specification

Screw Specification

Screw Specification

(OP)
hello everyone

i just have a simple question regarding the callout of a screw.

can someone explain what the 't' in a T3.0x10 screw means? is this torx, tapping or something else?

this is going to kill me if i dont find out!

thanks
gm

RE: Screw Specification

Well, there is such a thing as a "Type T" thread cutting screw. But your designation doesn't follow the nomenclature defined by the standard {ASME B18.6.5M).

http://www.eaglefastener.net/technical/screw-point...

Also, in your designation the 10 is where the thread pitch should be, but the value of 10 seems unlikely assuming that 3.0 is mm. All of course assuming that this is metric.

RE: Screw Specification

(OP)
gentlemem, thank you for your replies.

RE: Screw Specification

Mint,
I think the 10 is the lenght of the thread, just as M3x10 in metric thread

RE: Screw Specification

Since that callout does not appear to be in some standard form recognized by a lot of people, then the only one that can tell you for sure what it means is the one who wrote it. Go back to the source of the drawing and ask them. That is the only way you will know for sure what they meant.

RE: Screw Specification

Boogs is right; all of us are just guessing at the right answer. Whoever wrote it had something in mind, only they can tell you exactly what it was. If I had a dime for every messed up fastener description I have seen.......

RE: Screw Specification

Look at Mints link and take the screw noted T,
the dia is 3mm and the lenght of the thread is 10mm;
Is that so difficult?
Greetings

RE: Screw Specification

Well, the trouble is europipe that in some parts of the world - at least officially - you're meant to always state the pitch even for metric threads.

So without reference to a relevant thread standard the situation is ambiguous and so yes, if this is a real life question from the OP rather than 'I saw this in an article and didn't understand it' then Jboggs is correct and the OP needs to ask whoever gave him the spec.

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: Screw Specification

I'm sorry I have offended somebody,
Thought standard pitch was outside Europe also never mentioned.

RE: Screw Specification

Is there some kind of reward for that? smile

RE: Screw Specification

(OP)
thanks to everyone, your replies are really appreciated.

RE: Screw Specification

Europipe - let me tell you that in the US (and may be Burma and Liberia) they will always look for the pitch. So if they see M3 x 25 they have a hard time - NO PITCH. ANSI screwed up by allowing the pitch to be part of a coarse thread call out. Now every time you see a thread listed as M6 x 1 you have to wonder if there is not a coarser thread available. Would it not be easier if for standard threads (coarsest available) you could just say M6 as done in the rest of the world? If you saw M6 x 0.75 you would instantly know you are dealing with a "Fine Thread". By the way - metric coarse is used 95% of the time and most shops do not even have taps and dies for fine thread in stock.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources