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Unified National Course

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UNC (Unified Coarse Thread) Angle of Thread 60 Degrees

 

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Actions Size Outside Dia Inch Tpi Pitch Inch Thread Depth Thou Core Dia Male Inch Core Dia Female Inch Hex A/flats Inch Tapping Drill Size Inch Tapping Drill Size mm Letter Or Number
Number 1 0.073 64 0.016 10 0.054 0.056 5/32 0.055 1.4 54
Number 2 0.086 56 0.018 11 0.064 0.067 3/16 0.067 1.7 51
Number 3 0.099 48 0.021 13 0.073 0.076 7/32 0.079 2.0 47
Number 4 0.112 40 0.025 15 0.081 0.085 1/4 0.087 2.2 44
Number 5 0.125 40 0.025 15 0.094 0.098 9/32 0.098 2.5 40
Number 6 0.138 32 0.031 19 0.100 0.104 5/16 0.110 2.8 35
Number 8 0.164 32 0.031 19 0.126 0.130 11/32 0.134 3.4 29
Number 10 0.190 24 0.042 26 0.139 0.145 3/8 0.146 3.7 24
Number 12 0.216 24 0.042 26 0.165 0.171 13/32 0.173 4.4 16
1/4 0.250 20 0.050 31 0.189 0.196 7/16 0.205 5.2 7
5/16 0.313 18 0.056 34 0.244 0.252 1/2 0.256 6.5 F
3/8 0.375 16 0.063 38 0.298 0.307 9/16 0.311 7.9 5/16
7/16 0.438 14 0.071 44 0.350 0.360 5/8 0.366 9.3 U
1/2 0.500 13 0.077 47 0.406 0.417 3/4 0.421 10.7 27/64
9/16 0.563 12 0.083 51 0.460 0.472 13/16 0.476 12.1 31/64
5/8 0.625 11 0.091 56 0.514 0.527 15/16 0.531 13.5 17/32
3/4 0.750 10 0.100 61 0.627 0.642 1 - 1/8 0.650 16.5 21/32
7/8 0.875 9 0.111 68 0.739 0.755 1 - 5/16 0.766 19.5 49/64
1 1.000 8 0.125 77 0.847 0.865 1 - 1/2 0.876 22.3 7/8
1 - 1/8 1.125 7 0.143 88 0.950 0.970 1 - 11/16 0.984 25.0 63/64
1 - 1/4 1.250 7 0.143 88 1.075 1.095 1 - 7/8 1.109 28.2 1 - 7/64
1 - 3/8 1.375 6 0.167 102 1.171 1.195 2 - 1/16 1.211 30.8 1 - 7/32
1 - 1/2 1.500 6 0.167 102 1.296 1.320 2 - 1/4 1.328 33.8 1 - 21/64
1 - 3/4 1.750 5 0.200 123 1.505 1.534 2 - 7/16 1.547 39.3 1 - 35/64
2 2.000 41/2 0.222 136 1.727 1.759 2 - 5/8 1.781 45.3 1 - 25/32
2 - 1/4 2.250 41/2 0.222 136 1.977 2.009 2.028 51.5 2 - 1/32
2 - 1/2 2.500 4 0.250 153 2.193 2.229 2.244 57.0 2 - 1/4
2 - 3/4 2.750 4 0.250 153 2.443 2.479 2.500 63.5 2 - 1/2
3 3.000 4 0.250 153 2.693 2.729 2.756 70.0 2 - 3/4
3 - 1/4 3.250 4 0.250 153 2.943 2.979 3.012 76.5 3

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