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USER GUIDE
UNIFIED Fine Thread TAPS
Nominal Dimensions According to ANSI B1.1

Tap flank diameter production tolerances for ISO 2B Coarse Pitch Threads Dimensions in mm
Nut threads limit dimensions - nut threads ANSI B1.1, 2B-3B
1/8·H H = 0.86603P
Nut thread
5
H1 = H = 0.54127P
8
1/2·H
H1 h3 17
60° h3 = H = 0.61343P
H 24
3
60° d2 = D2 = d- H = d-0.64952P
1/2·H 4
Screw
1/4·H 1/6·H d3 = d-2h3 = d-1.22687P
r
H
r = = 0.14434P
DD2 D1 P d3 d2 d 6
Pitch diameter Pitch diameter
Flank Minor diameter
External Tap tolerance 2B Nut tolerance
Nominal T.P.I Dia. Pitch P Dia.
Dia. d=D max.
d2=D2 Nut D1 Screw h3 Min. Max. max. 2B max. 3B
2B/3B
UNF#0 80 0.318 1.524 1.318 1.181 1.135 1.331 1.344 1.318 1.377 1.361
UNF#1 72 0.353 1.854 1.626 1.473 1.422 1.638 1.651 1.626 1.689 1.674
UNF#2 64 0.397 2.184 1.928 1.755 1.697 1.941 1.953 1.928 1.996 1.979
UNF#3 56 0.454 2.515 2.220 2.024 1.958 2.233 2.245 2.220 2.291 2.273
UNF#4 48 0.529 2.845 2.502 2.271 2.195 2.515 2.527 2.502 2.581 2.560
UNF#5 44 0.577 3.175 2.799 2.550 2.466 2.812 2.824 2.799 2.880 2.860
UNF#6 40 0.635 3.505 3.094 2.817 2.725 3.108 3.119 3.094 3.180 3.157
UNF#8 36 0.706 4.166 3.708 3.401 3.299 3.721 3.734 3.708 3.800 3.777
UNF#10 32 0.794 4.826 4.310 3.967 3.853 4.336 4.348 4.310 4.409 4.384
UNF#12 28 0.907 5.486 4.897 4.503 4.374 4.923 4.935 4.897 5.004 4.976
UNF 1/4" 28 0.907 6.350 5.761 5.367 5.237 5.799 5.812 5.761 5.870 5.842
UNF 5/16" 24 1.058 7.938 7.249 6.792 6.640 7.287 7.300 7.249 7.371 7.341
UNF 3/8" 24 1.058 9.525 8.837 8.379 8.227 8.875 8.887 8.837 8.961 8.931
UNF 7/16" 20 1.270 11.112 10.287 9.738 9.555 10.338 10.351 10.287 10.424 10.391
UNF 1/2" 20 1.270 12.700 11.874 11.326 11.143 11.925 11.938 11.874 12.017 11.981
UNF 9/16" 18 1.411 14.288 13.371 12.761 12.555 13.421 13.434 13.371 13.520 13.482
UNF 5/8" 18 1.411 15.875 14.958 14.348 14.143 15.009 15.022 14.958 15.110 15.072
UNF 3/4" 16 1.588 19.050 18.019 17.330 17.102 18.070 18.082 18.019 18.184 18.143
UNF 7/8" 14 1.814 22.225 21.046 20.262 20.000 21.110 21.123 21.046 21.224 21.181
UNF 1" 12 2.117 25.400 24.026 23.109 22.804 24.089 24.102 24.026 24.219 24.171
UNF 1*1/8" 12 2.117 28.575 27.201 26.284 25.979 27.252 27.277 27.201 27.339 27.351
UNF 1*1/4" 12 2.117 31.750 30.376 29.459 29.154 30.427 30.452 30.376 30.579 30.528
UNF 1*3/8" 12 2.117 34.925 33.551 32.634 32.329 33.602 33.627 33.551 33.759 33.706
UNF 1*1/2" 12 2.117 38.100 36.726 35.809 35.504 36.777 36.802 36.726 36.937 36.886

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