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santoshh
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Join Date: Dec 2012
Location: Nasik, India
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International Standard for Metric Thread Length

12/21/2012 7:08 AM

Is there any international standard available which defines metric thread length ?

Following are the internal threading details for which it is required.

  1. Thread specs : M3 X 0.5 6H, M4 X 0.7 6H
  2. Material Grade: SS316

Regards,
Santoshh,Nasik, India.
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JPool
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#1

Re: International standard for Metric thread length.

12/21/2012 7:14 AM

Does this help? :

http://en.wikipedia.org/wiki/ISO_metric_screw_thread

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santoshh
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#2
In reply to #1

Re: International standard for Metric thread length.

12/21/2012 7:26 AM

It is thread depth towards periphery of thread.

Actually there is a thumb rule (not written anywhere) said that L/D ratio for internal thread formation should not exceed 2.5mm. According to this, for M3 X 0.5 internal thread it comes around 7.5 mm thread length. Is this assumption is available in any international standard.
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JPool
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#3
In reply to #2

Re: International standard for Metric thread length.

12/21/2012 7:42 AM

I beleive the standard is ISO 68-1

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PWSlack
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#4

Re: International standard for Metric thread length.

12/21/2012 7:50 AM

Some facilities insist on "between three and six turns sticking out beyond the nut".

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Joshi
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#5

Re: International standard for Metric thread length.

12/21/2012 8:03 AM

If you have the time & patience, do some research. The links below may help you.

International standard for Metric thread length.
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lyn
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#6

Re: International Standard for Metric Thread Length

12/21/2012 8:19 AM

Thread length should be long enough to assure three full threads of engagement in the mating fastener.
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Jacob Klepatch
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#7

Re: International Standard for Metric Thread Length

12/23/2012 12:57 AM

Not sure if exist one,but I remember a test done to reveal stress in threaded area

-it took 6 threads to contain normal stress distribution 1Sgma deviation (for coarse

threads)
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Users who posted comments:

Jacob Klepatch (1); Joshi (1); JPool (2); lyn (1); PWSlack (1); santoshh (1)

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