Table 1. American Standard Unified Inch Screw Thread Form Data
Depth of Int. Thd. and UN Ext. Thd. a 0.54127 P 0.00677 0.00752 0.00846 0.00967 0.01128 0.01230 0.01353 0.01504 0.01691 0.01933 0.02005 0.02255 0.02706 0.03007
Truncation of UNR Ext. Thd. Root b 0.16238 P 0.00203 0.00226
Truncation of Ext. Thd. Crest 0.10825 P 0.00135 0.00150
Truncation of Int. Thd. Root 0.10825 P 0.00135 0.00150
Truncation of Int. Thd. Crest 0.2165 P 0.00271 0.00301
Flat at Ext. Thd. Crest and Int. Thd. Root
Basic Flat at Int. Thd. Crest c 0.25 P 0.00312 0.00347 0.00391 0.00446 0.00521 0.00568 0.00625 0.00694 0.00781 0.00893 0.00926 0.01042 0.01250 0.01389 0.01562 0.01786 0.01923 0.02083 0.02174 0.02273 0.02500 0.02778 0.03125 0.03571 0.04167 0.05000 0.05556 0.06250
Maximum Ext. Thd. Root Radius 0.14434 P 0.00180 0.00200 0.00226 0.00258 0.00301 0.00328
Depth of Sharp V-Thread 0.86603 P 0.01083 0.01203 0.01353 0.01546 0.01804 0.01968 0.02165 0.02406 0.02706 0.03093 0.03208 0.03608 0.04330 0.04811 0.05413 0.06186 0.06662 0.07217 0.07531 0.07873 0.08660 0.09623 0.10825 0.12372 0.14434 0.17321 0.19245 0.21651
Depth of UNR Ext. Thd. 0.59539 P 0.00744 0.00827 0.00930 0.01063 0.01240 0.01353 0.01488 0.01654 0.01861 0.02126 0.02205 0.02481 0.02977 0.03308 0.03721 0.04253 0.04580 0.04962 0.05177 0.05413 0.05954 0.06615 0.07442 0.08506 0.09923 0.11908 0.13231 0.14885
Truncation of Ext. Thd. Root 0.21651 P
Addendum of Ext. Thd. 0.32476 P 0.00406 0.00451
Threads per Inch
Pitch
0.125 P 0.00156 0.00174 0.00195 0.00223 0.00260 0.00284 0.00312 0.00347 0.00391 0.00446 0.00463 0.00521 0.00625 0.00694 0.00781 0.00893 0.00962 0.01042 0.01087 0.01136 0.01250 0.01389 0.01562 0.01786 0.02083 0.02500 0.02778 0.03125
n
P
80 72 64 56 48 44 40 36 32 28 27 24 20 18 16 14 13 12 11 10
0.01250 0.01389 0.01563 0.01786 0.02083 0.02273 0.02500 0.02778 0.03125 0.03571 0.03704 0.04167 0.05000 0.05556 0.06250 0.07143 0.07692 0.08333 0.08696 0.09091 0.10000 0.11111 0.12500 0.14286 0.16667 0.20000 0.22222 0.25000
0.00271 0.00301 0.00338 0.00387 0.00451 0.00492 0.00541 0.00601 0.00677 0.00773 0.00802 0.00902 0.01083 0.01203 0.01353 0.01546 0.01655 0.01804 0.01883 0.01968 0.02165 0.02406 0.02706 0.03093 0.03608 0.04330 0.04811 0.05413
0.00254 0.00290 0.00338 0.00369 0.00406 0.00451 0.00507 0.00580 0.00601 0.00677 0.00812 0.00902 0.01015 0.01160 0.01249 0.01353 0.01412 0.01476 0.01624 0.01804 0.02030 0.02320 0.02706 0.03248 0.03608 0.04059
0.00169 0.00193 0.00226 0.00246 0.00271 0.00301 0.00338 0.00387 0.00401 0.00451 0.00541 0.00601 0.00677 0.00773 0.00833 0.00902 0.00941 0.00984 0.01083 0.01203 0.01353 0.01546 0.01804 0.02165 0.02406 0.02706
0.00169 0.00193 0.00226 0.00246 0.00271 0.00301 0.00338 0.00387 0.00401 0.00451 0.00541 0.00601 0.00677 0.00773 0.00833 0.00902 0.00941 0.00984 0.01083 0.01203 0.01353 0.01546 0.01804 0.02165 0.02406 0.02706
0.00338 0.00387 0.00451 0.00492 0.00541 0.00601 0.00677 0.00773 0.00802 0.00902 0.01083 0.01203 0.01353 0.01546 0.01665 0.01804 0.01883 0.01968 0.02165 0.02406 0.02706 0.03093 0.03608 0.04330 0.04811 0.05413
0.00507 0.00580 0.00677 0.00738 0.00812 0.00902 0.01015 0.01160 0.01203 0.01353 0.01624 0.01804 0.02030 0.02320 0.02498 0.02706 0.02824 0.02952 0.03248 0.03608 0.04059 0.04639 0.05413 0.06495 0.07217 0.08119
0.00361 0.00401 0.00451 0.00515 0.00535 0.00601 0.00722 0.00802 0.00902 0.01031 0.01110 0.01203 0.01255 0.01312 0.01443 0.01604 0.01804 0.02062 0.02406 0.02887 0.03208 0.03608
0.03383 0.03866 0.04164 0.04511 0.04707 0.04921 0.05413 0.06014 0.06766 0.07732 0.09021 0.10825 0.12028 0.13532
11 1 ∕ 2
9 8 7 6 5
4 1 ∕ 2
4
a Also depth of thread engagement. b Design profile. c Also basic flat at external UN thread root. All dimensions are in inches.
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