Page 60 - HOLE MAKING CATALOG p311-382

TAPS USER GUIDE

UNIFIED Coarse 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 Dia. Minor diameter Pitch diameter Pitch diameter
Dia. d=D d2=D2 Tap tolerance 2B Nut tolerance
Nominal T.P.I Dia. Pitch P
1.854 1.598 Screw max.
0.397 2.184 1.890 Nut D1 h3 Min. Max. 2B/3B max. 2B max. 3B
0.454 2.515 2.172
UNC#1 64 0.529 2.845 2.433 1.425 1.367 1.610 1.623 1.598 1.664 1.646
UNC# 2 64 0.635 3.175 2.764 1.694 1.628 1.902 1.915
UNC#3 48 0.635 3.505 2.990 1.941 1.864 2.184 2.197 1.890 1.961 1.943
UNC# 4 40 0.794 4.166 3.650 2.156 2.065 2.446 2.459
UNC# 5 40 0.794 4.826 4.138 2.487 2.395 2.776 2.789 2.172 2.248 2.228
UNC# 6 32 1.058 5.486 4.798 2.647 2.532 3.105 3.028
UNC# 8 32 1.058 6.350 5.524 3.307 3.193 3.675 3.688 2.433 2.517 2.494
UNC# 10 24 1.270 7.938 7.021 3.680 3.528 4.163 4.176
UNC# 12 24 1.411 9.525 8.494 4.341 4.188 4.823 4.836 2.764 2.847 2.827
UNC 1/4" 20 1.588 11.112 9.934 4.976 4.793 5.575 5.588
UNC 5/16" 18 1.814 12.700 11.430 6.411 6.205 7.071 7.084 2.990 3.084 3.058
UNC 3/8" 16 1.954 14.288 12.913 7.805 7.577 8.545 8.557
UNC 7/16" 14 2.117 15.875 14.376 9.149 8.887 9.985 9.997 3.650 3.746 3.721
UNC 1/2" 13 2.309 19.050 17.399 10.584 10.302 11.481 11.494
UNC 9/16" 12 2.540 22.225 20.391 11.996 11.692 12.964 12.977 4.138 4.247 4.219
UNC 5/8" 11 2.822 25.400 23.338 13.376 13.043 14.427 14.440
UNC 3/4" 10 3.175 28.575 26.218 16.229 15.933 17.450 17.463 4.798 4.910 4.882
UNC 7/8" 9 3.629 31.750 29.393 19.169 18.763 20.455 20.467
UNC 1" 8 3.629 34.925 32.174 21.963 21.504 23.401 23.414 5.524 5.646 5.616
UNC 1 1/8" 7 4.233 38.100 35.349 24.648 24.122 26.294 26.319
UNC 1 1/4" 7 4.233 44.450 41.151 27.823 27.297 29.469 29.494 7.021 7.155 7.120
UNC 1 3/8" 6 5.080 50.800 47.135 30.343 29.731 32.250 32.276
UNC 1 1/2" 6 5.644 57.150 53.485 33.518 32.906 35.425 35.451 8.494 8.639 8.603
UNC 1 3/4" 5 5.644 63.500 59.375 38.951 38.217 41.241 41.266
UNC 2" 4 1/2 6.350 69.850 65.725 44.689 43.876 47.235 47.260 9.934 10.089 10.051
UNC 2 1/4" 4 1/2 6.350 76.200 72.075 51.039 50.226
UNC 2 1/2" 4 6.350 82.550 78.425 56.627 55.710 11.430 11.595 11.552
UNC 2 3/4" 4 6.350 88.900 84.775 62.977 62.060
UNC 3" 4 6.350 95.250 91.125 69.327 68.410 12.913 13.086 13.043
UNC 3 1/4" 4 6.350 101.600 97.475 75.677 74.760
UNC 3 1/2" 4 6.350 82.027 81.110 14.376 14.559 14.514
UNC 3 3/4" 4 88.377 87.460
UNC 4" 4 94.727 93.810 17.399 17.595 17.544

20.391 20.599 20.546

23.338 23.561 23.505

26.218 26.457 26.398

29.393 29.637 29.576

32.174 32.438 32.372

35.349 35.616 35.550

41.151 41.445 41.372

47.135 47.450 47.371

53.485 53.805 53.726

59.375 59.718 59.632

65.725 66.073 65.987

72.075 72.428 72.339

78.425 78.783 78.694

84.775 85.183 85.049

91.125 91.493 91.402

97.475 97.848 97.757

370 ISCAR