Page 76 - Aluminum_Machining_catalog_2023

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
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 Tap Tolerance 2B Nut Tolerance
External Dia. Screw Max.
Nominal T.P.I Dia. Pitch P Dia. d=D D2=D2 Nut D1 H3 Min. Max. 2B/3B Max. 2B Max. 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

74 ISCAR