Table 1. Basic Profile Dimensions UNJ Threads ANSI/ASME B1.15-1995
Flat at Internal Thread Root and External Thread Crest
Height of Internal Thread and Depth of Thread Engagement
Truncation of Internal Thread Root and External Thread Crest
Flat at Internal Thread Crest 0.3125 P
Half Addendum of External Thread (REF. ONLY)
Height of Sharp V Thread 0.010825 0.012028 0.013532 0.015465 0.018042 0.019682 0.021651 0.024056 0.027063 0.030929 0.036084 0.043301 0.048113 0.054127 0.061859 0.072169 0.078730 0.086603 0.096225 0.108253 0.123718 0.144338 0.173205 0.192450 0.216506
Truncation of Internal Thread Crest
Threads per inch
Addendum of External Thread
Pitch Pitch Line
P = 1/ n
0.5 P
0.125 P H = 0.866025 P 0.5625 H = 0.487139 P 0.375 H = 0.324760 P 0.3125 H = 0.270633 P 0.125 H = 0.108253 P 0.1875 H = 0.16238 P
n
80 0.012500 0.006250 0.00391 0.00156 72 0.013889 0.006944 0.00434 0.00174 64 0.015625 0.007813 0.00488 0.00195 56 0.017857 0.008929 0.00558 0.00223 48 0.020833 0.010417 0.00651 0.00260 44 0.022727 0.011364 0.00710 0.00284 40 0.025000 0.012500 0.00781 0.00313 36 0.027778 0.013889 0.00868 0.00347 32 0.031250 0.015625 0.00977 0.00391 28 0.035714 0.017857 0.01116 0.00446 24 0.041667 0.020833 0.01302 0.00521 20 0.050000 0.025000 0.01563 0.00625 18 0.055556 0.027778 0.01736 0.00694 16 0.062500 0.031250 0.01953 0.00781 14 0.071429 0.035714 0.02232 0.00893 12 0.083333 0.041667 0.02604 0.01042 11 0.090909 0.045455 0.02841 0.01136 10 0.100000 0.050000 0.03125 0.01250 9 0.111111 0.055556 0.03472 0.01389 8 0.125000 0.062500 0.03906 0.01563 7 0.142857 0.071429 0.04464 0.01786 6 0.166667 0.083333 0.05208 0.02083 5 0.200000 0.100000 0.06250 0.02500 4.5 0.222222 0.111111 0.06944 0.02778 4 0.250000 0.125000 0.07813 0.03125
0.00609 0.00677 0.00761 0.00870 0.01015 0.01107 0.01218 0.01353 0.01522 0.01740 0.02030 0.02436 0.02706 0.03045 0.03480 0.04059 0.04429 0.04871 0.05413 0.06089 0.06959 0.08119 0.09743 0.10825 0.12178
0.00406 0.00451 0.00507 0.00580 0.00677 0.00738 0.00812 0.00902 0.01015 0.01160 0.01353 0.01624 0.01804 0.02030 0.02320 0.02706 0.02952 0.03248 0.03608 0.04060 0.04639 0.05413 0.06495 0.07217 0.08119
0.00338 0.00376 0.00423 0.00483 0.00564 0.00615 0.00677 0.00752 0.00846 0.00967 0.01128 0.01353 0.01504 0.01691 0.01933 0.02255 0.02460 0.02706 0.03007 0.03383 0.03866 0.04511 0.05413 0.06014 0.06766
0.00135 0.00150 0.00169 0.00193 0.00226 0.00246 0.00271 0.00301 0.00338 0.00387 0.00451 0.00541 0.00601 0.00677 0.00773 0.00902 0.00984 0.01083 0.01203 0.01353 0.01546 0.01804 0.02165 0.02406 0.02706
0.00203 0.00226 0.00254 0.00290 0.00338 0.00369 0.00406 0.00451 0.00507 0.00580 0.00677 0.00812 0.00902 0.01015 0.01160 0.01353 0.01476 0.01624 0.01804 0.02030 0.02320 0.02706 0.03248 0.03608 0.04060
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