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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
Number 1 0.07 64 0.02 10 0.05 0.06 5/32 0.06 1.4 54
Number 2 0.09 56 0.02 11 0.06 0.07 3/16 0.07 1.7 51
Number 3 0.10 48 0.02 13 0.07 0.08 7/32 0.08 2.0 47
Number 4 0.11 40 0.03 15 0.08 0.08 1/4 0.09 2.2 44
Number 5 0.13 40 0.03 15 0.09 0.10 9/32 0.10 2.5 40
Number 6 0.14 32 0.03 19 0.10 0.10 5/16 0.11 2.8 35
Number 8 0.16 32 0.03 19 0.13 0.13 11/32 0.13 3.4 29
Number 10 0.19 24 0.04 26 0.14 0.14 3/8 0.15 3.7 24
Number 12 0.22 24 0.04 26 0.16 0.17 13/32 0.17 4.4 16
1/4 0.25 20 0.05 31 0.19 0.20 7/16 0.20 5.2 7
5/16 0.31 18 0.06 34 0.24 0.25 1/2 0.26 6.5 F
3/8 0.38 16 0.06 38 0.30 0.31 9/16 0.31 7.9 5/16
7/16 0.44 14 0.07 44 0.35 0.36 5/8 0.37 9.3 U
1/2 0.50 13 0.08 47 0.41 0.42 3/4 0.42 10.7 27/64
9/16 0.56 12 0.08 51 0.46 0.47 13/16 0.48 12.1 31/64

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