Need thread call outs for 1 1/2 - 12

[RiverDave]

Need the major / minor & Pitch diameters of both an external and internal 1 1/2 - 12 thread..

Typically I do smaller pieces, and I can't seem to find this information anywhere.

Dave Johnson

[RICHARD ZASTROW]

Not even in your mandatory Machinery's Handbook????????

Dick Z

[RiverDave]

Well I used to have a couple of those, but when we downsized the books along with a bunch of other things are now gone.

On that note, I do specifically remember that the books I had only went to 1 inch, and then had a math formula to calculate larger threads.

Being I don't have the book, I don't have the formula.

RD

[TomB]

My little "Engineers Black Book" gives
1) it is UNF
2) Basic Major Diameter 1.500
3) Basic Effective Diameter 1.4459
4) Basic Minor Dia of Ext thd 1.3978
5) Basic Minor Dia of Int Thd 1.4098
6) Tapping Drill Size 1 27/64
7) Clearance Drill Size 1 17/32

[basalt]

Good morning Dave,
I wrote a paper on UN/UNR/UNJ Threads, the section "Easy Memory Chart" has all the formulas required.
Hope this helps.
The link is below.

un-unr-unj-threads