Page 61 - HOLE MAKING CATALOG p311-382

USER GUIDE TAPS

UNIFIED Fine Thread
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

Nut thread 1/8·H H = 0.86603P

1/2·H H1 = 5 H = 0.54127P
H 8
H1 17
1/2·H 1/4·H r 60° h3 h3 = 24 H = 0.61343P

60° d2 = D2 = d- 3 H = d-0.64952P
Screw1/6·H 4

d3 = d-2h3 = d-1.22687P

D D2 D1 P d3 d2 d r = H = 0.14434P
6

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

10.287 10.424 10.391

11.874 12.017 11.981

13.371 13.520 13.482

14.958 15.110 15.072

18.019 18.184 18.143

21.046 21.224 21.181

24.026 24.219 24.171

27.201 27.339 27.351

30.376 30.579 30.528

33.551 33.759 33.706

36.726 36.937 36.886

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