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johni357 (Aerospace) (OP)
16 Jan 08 14:45

Trying to find some thread data (i.e. Maj. Dia, Pitch Dia. etc...etc..) for the following thread:

1.563 - 18 UNS - 3A

The machinist's handbook outlines some unified thread types but does not seem to include this UNS thread! unless I am looking in the wrong place! any help would be appreciated

Timelord (Mechanical)
16 Jan 08 16:35

My copy of Machinery's Handbook lists UNS threads as "selected combinations" of diameter and pitch.  UNS threads are listed in Table 14 labeled "Standard Series and Selected Combinations".  The catch is that the 1.563-18 thread is listed as UNEF (extra fine) not UNS.  the good news is the table gives you all the data you need for the 1-9/16-18 thread.

Pressed (Mechanical)
28 Feb 08 15:49
You could search in google, or this forum:

Business Page

MadMango (Mechanical)
28 Feb 08 16:12
Timelord, I think you meant Table 4.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read FAQ731-376: Forum Policies to make the best use of Eng-Tips Forums?

Timelord (Mechanical)
28 Feb 08 16:40

My bad, Table 4 is correct. In the section called Screw Thread Systems.

KENAT (Mechanical)
14 Mar 08 13:41
In UNS the S means special, so by definition it is not a standard size and is unlikely to be in a pre-calculated table.  This means you should calculate it from scratch using the definitions in ASME B1.1 or equivalent.

From what Timelord says your example may not actually be a special but a standard UNEF.

For true specials I find useful but as it's free you need to verify it.  I've checked it a couple of times and found it correct but that's no guarantee.

The below is the results for your thread, the diameters are given at the bottom of the pop up.;txtnut_factor=0.2&txtlength_of_engagement=.43&txtstatic_load=.25&txtis_javascript_enabled=yes&;txtis_this_output=no&txtcalculation_number=5&txtvisitor_number=xxx&txtswitching=no&txtswitched=no&txtfirst_time=no&submit=Calculate+Now

KENAT, probably the least qualified checker you'll ever meet...

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