screw 1

[mohtogh]

Hello,
Could anyone tell me:
Major diameter(min, max),pitch diameter(min. max)
of:
1 29/32" *24 UNS-3A
I search for this but cannot find in:
ASME/ANSI B1.1-1989
Furthermore, Is the profile angle 55 deg or 60 deg ?
Thanks

 

[fastech]

Your 1 29/32 (1.906) does not appear to be a standard thread size. Neither does the 24 pitch match the bolt size. I have not run across any UNS-3A standards. Everything about this is strange unless it may be a soft converted metric?

You might go to

http://www.boltscience.com

and ask them. Mr. Eccles has many tables on his web site that you might find something close. Bill P.
CSFT, Inc.

 

[ghillis]

All UN, UNS, UNEF, etc are all 60 degree.

UNS means that the thread dimensions are calculated according to ANSI/ASME B1.1 Section 5 and 8, but the designer is supposed to call out the Major Diameter, Pitch Diameter and Minor Diameter since the engagement is a factor in the answer since as the engagement increases, the tolerances loosen. As a result of all of this with the fine threads, minor variations from the required dimensions may have a major impact on strength, and reverse engineering is potentially dangerous. Also plating must be considered properly. With those warnings out of the way the dims are:

Major 1.9062 / 1.8990

Pitch 1.8792 / 1,8764

Minor 1.8494 Min (Max is ref only .18611)

Pitch and minor diameter are reduced as follows:
Engagement Change
1/4" .0006
1/2" .0008
1" .0011
or .001125 x sqrt(engagement (in))

 

[tennesseewalker]

Looking for the diameter of metric taptite screws?