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


13 mm thread?

13 mm thread?

13 mm thread?

Question.. Has anyone ran across a 13mm Thread.. looking for the data if so. Thanks in advance.

RE: 13 mm thread?

My guess would be it's a 'special' in the way you get UNS threads of non standard diameters etc.

A cursory glance at ASME B1.13M-2201 the US Metric Screw Thread spec seems to back this up as it isn't in the standard look up tables.

Closer examination section 7.6 applies "Designation of Special Threads" with wording reminiscent of the section on UNS threads in B1.1.

Quote (ASME B1.13M-2201 Section 7.6 Designation of Special threads)

Special diameter-pitch threads, developed in accordance with this Standard, shall be identified by the letters SPL following the tolerance class. Below the designation shall be specified the limits of size for major diameter, pitch diameter, and minor diameter.

To calculate the tolerances etc. see section 9 of above standard.

My guess is taps & dies may be moderately available for some 13 mm threads to support replacing 1/2" threaded items but I could be wrong.

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: 13 mm thread?

There is an M13 X1.5 thread standard for threaded repair inserts (Threadserts), and an M13 standard for bubble flare nuts for Hydraulic tubing.
What is your end use.

You are judged not by what you know, but by what you can do.

RE: 13 mm thread?

My copy of ASME B1.21M-1997 (MJ thread forms) does not list 13mm threads in the standard series tables as either 1st or 2nd choice. But section 6.6 provides guidance, similar to that noted by KENAT above, for designation of special series "MJS" threads having a non-standard diameter such as 13mm.

RE: 13 mm thread?

Thanks Guys for the information.. This is what I need.. Have an awesome weekend all..

RE: 13 mm thread?

just bear in mind, special go & no go gages will have to be fabricates, as well as special type of cutting tools. you did not explain if these are internal or external or both.
external can be single point or thread ground, internal will have to be tapped. and depending on the the tolerance. a better explanation can be achieved if more information is given.

RE: 13 mm thread?

13 mm makes me think of 1/4" BSP.

RE: 13 mm thread?

Make sure it's not just somebody's metric conversion of 1/2".

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!


Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close