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Unified National Course

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UNC (Unified Coarse Thread) Angle of Thread 60 Degrees
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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
5/8 0.63 11 0.09 56 0.51 0.53 15/16 0.53 13.5 17/32
3/4 0.75 10 0.10 61 0.63 0.64 1 - 1/8 0.65 16.5 21/32
7/8 0.88 9 0.11 68 0.74 0.75 1 - 5/16 0.77 19.5 49/64
1 1.00 8 0.13 77 0.85 0.86 1 - 1/2 0.88 22.3 7/8
1 - 1/8 1.13 7 0.14 88 0.95 0.97 1 - 11/16 0.98 25.0 63/64
1 - 1/4 1.25 7 0.14 88 1.07 1.09 1 - 7/8 1.11 28.2 1 - 7/64
1 - 3/8 1.38 6 0.17 102 1.17 1.19 2 - 1/16 1.21 30.8 1 - 7/32
1 - 1/2 1.50 6 0.17 102 1.30 1.32 2 - 1/4 1.33 33.8 1 - 21/64
1 - 3/4 1.75 5 0.20 123 1.50 1.53 2 - 7/16 1.55 39.3 1 - 35/64
2 2.00 41/2 0.22 136 1.73 1.76 2 - 5/8 1.78 45.3 1 - 25/32
2 - 1/4 2.25 41/2 0.22 136 1.98 2.01 2.03 51.5 2 - 1/32
2 - 1/2 2.50 4 0.25 153 2.19 2.23 2.24 57.0 2 - 1/4
2 - 3/4 2.75 4 0.25 153 2.44 2.48 2.50 63.5 2 - 1/2
3 3.00 4 0.25 153 2.69 2.73 2.76 70.0 2 - 3/4
3 - 1/4 3.25 4 0.25 153 2.94 2.98 3.01 76.5 3

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