British Std Brass

Size Outside Dia Inch Tpi Pitch Inch Core Dia Inch Radius Inch Thread Depth Thou Tapping Drill Size Inch Tapping Drill Size Mm Letter Or Number
1/8 0.125 26 0.038 0.076 0.005 25 0.079 2.0 47
1/4 0.250 26 0.038 0.201 0.005 25 0.204 5.2 6
3/8 0.375 26 0.038 0.326 0.005 25 0.332 8.5 Q
1/2 0.500 26 0.038 0.451 0.005 25 0.453 11.5 29/64
5/8 0.625 26 0.038 0.566 0.005 25 0.578 14.7 37/64
3/4 0.750 26 0.038 0.701 0.005 25 0.703 17.9 45/64
7/8 0.875 26 0.038 0.826 0.005 25 0.828 21.0 53/64
1 1.000 26 0.038 0.951 0.005 25 0.953 24.2 61/64
1 - 1/8 1.125 26 0.038 1.076 0.005 25 1.078 27.4 1 - 5/64
1 - 1/4 1.250 26 0.038 1.201 0.005 25 1.203 30.6 1 - 13/64
1 - 1/2 1.500 26 0.038 1.451 0.005 25 1.453 36.8 1 - 29/64