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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
3 - 1/2 3.50 4 0.25 153 3.19 3.23 3.27 83.0 3 - 1/4
3 - 3/4 3.75 4 0.25 153 3.41 3.48 3.50 89.0 3 - 1/2
4 4.00 4 0.25 153 3.69 3.73 3.76 95.5 3 - 3/4

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