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Screw Thread Tables

Coarse Thread Table

Basic Dimensions for Coarse Thread Series Parts (UNC/UNRC)
(measured in inches)
Nominal Size
Major Diameter
Threads/inch
Basic Pitch Diameter
Minor Diameter
Lead Angle
at Basic Pitch Diameter
Height of Fundamental Triangle
Tensile Stress Area
(Degrees)
(Min)
(square inches)
#1 0.073 64 0.063 0.056 4 31 0.01353
0.003
#2 0.086 56 0.074 0.067 4 22 0.01547
0.004
#3 0.099 48 0.086 0.076 4 26 0.01804
0.005
#4 0.112 40 0.096 0.085 4 45 0.02165
0.006
#5 0.125 40 0.109 0.098 4 11 0.02165
0.008
#6 0.138 32 0.118 0.104 4 50 0.02706
0.009
#8 0.164 32 0.144 0.130 3 58 0.02706
0.014
#10 0.190 24 0.163 0.145 4 39 0.03608
0.018
#12 0.216 24 0.189 0.171 4 1 0.03608
0.024
1/4 0.250 20 0.218 0.196 4 11 0.04330
0.032
5/16 0.313 18 0.276 0.252 3 40 0.04811
0.052
3/8 0.375 16 0.334 0.307 3 24 0.05413
0.078
7/16 0.438 14 0.391 0.360 3 20 0.06186
0.106
1/2 0.500 13 0.450 0.417 3 7 0.06662
0.142
9/16 0.563 12 0.508 0.472 2 59 0.07217
0.182
5/8 0.625 11 0.566 0.527 2 56 0.07873
0.226
3/4 0.750 10 0.685 0.642 2 40 0.08660
0.334
7/8 0.875 9 0.803 0.755 2 31 0.09623
0.462
1 1.000 8 0.919 0.865 2 29 0.10825
0.606
1 1/8 1.125 7 1.032 0.941 2 31 0.12372
0.763
1 1/4 1.250 7 1.157 1.095 2 15 0.12372
0.969
1 3/8 1.375 6 1.267 1.195 2 24 0.14434
1.155
1 1/2 1.500 6 1.392 1.320 2 11 0.14434
1.405
1 3/4 1.750 5 1.620 1.534 2 15 0.17321
1.900
2 2.000 4 1/2 1.856 1.759 2 11 0.19245
2.500
2 1/4 2.250 4 1/2 2.106 2.009 1 55 0.19245
3.250
2 1/2 2.500 4 2.338 2.229 1 57 0.21651
4.000
2 3/4 2.750 4 2.588 2.479 1 46 0.21651
4.930
3 3.000 4 2.838 2.729 1 36 0.21651
5.970
3 1/4 3.250 4 3.088 2.979 1 29 0.21651
7.100
3 1/2 3.500 4 3.338 3.229 1 22 0.21651
8.330
3 3/4 3.750 4 3.588 3.479 1 16 0.21651
9.660
4 4.000 4 3.838 3.729 1 11 0.21651
11.080
(standards set by American Society of Mechanical Engineers)

Fine Thread Table

Basic Dimensions for Fine Thread Series Parts (UNF/UNRF)
(measured in inches)
Nominal Size
Major Diameter
Threads/inch
Basic Pitch Diameter
Minor Diameter
Lead Angle
at Basic Pitch Diameter
Height of Fundamental Triangle
Tensile Stress Area
(Degrees)
(Min)
(square inches)
#0
0.060 80 0.052 0.047 4 23
0.01083
0.002
#1
0.073 72 0.064 0.058 3 57
0.01203
0.003
#2
0.086 64 0.076 0.069 3 45
0.01353
0.004
#3
0.099 56 0.087 0.080 3 43
0.01547
0.005
#4
0.112 48 0.099 0.089 3 51
0.01804
0.007
#5
0.125 44 0.110 0.100 3 45
0.01968
0.008
#6
0.138 40 0.122 0.111 3 44
0.02165
0.010
#8
0.164 36 0.146 0.134 3 28
0.02406
0.015
#10
0.190 32 0.170 0.156 3 21
0.02706
0.020
#12
0.216 28 0.193 0.177 3 22
0.03093
0.026
1/4
0.250 28 0.227 0.211 2 52
0.03093
0.036
5/16
0.313 24 0.285 0.267 2 40
0.03608
0.058
3/8
0.375 24 0.348 0.330 2 11
0.03608
0.088
7/16
0.438 20 0.405 0.383 2 15
0.04330
0.119
1/2
0.500 20 0.468 0.446 1 57
0.04330
0.160
9/16
0.563 18 0.526 0.502 1 55
0.04811
0.203
5/8
0.625 18 0.589 0.565 1 43
0.04811
0.256
3/4
0.750 16 0.709 0.682 1 36
0.05413
0.373
7/8
0.875 14 0.829 0.798 1 34
0.06186
0.509
1
1.000 14 0.946 0.903 1 36
0.07217
0.663
1 1/8
1.125 12 1.071 1.035 1 25
0.07217
0.856
1 1/4
1.250 12 1.196 1.160 1 16
0.07217
1.073
1 3/8
1.375 12 1.321 1.285 1 9
0.07217
1.315
1 1/2
1.500 12 1.446 1.410 1 3
0.07217
1.581
(standards set by American Society of Mechanical Engineers)
 

 

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