Table:
text: British Standard Whitworth
List of thread sizes
Whitworth thread sizes
Whitworth_size_in Core_diameter_in Threads_per_inch Pitch_in Tapping_drill_size_
1/16 0.0411 60 0.0167 Number Drill 56 (1.2 mm)
3/32 0.0672 48 0.0208 Number Drill 49 (1.85 mm)
1/8 0.0930 40 0.025 Number Drill 39 (2.55 mm)
5/32 0.1162 32 0.0313 Number Drill 30 (3.2 mm)
3/16 0.1341 24 0.0417 Number Drill 26 (3.7 mm)
7/32 0.1654 24 0.0417 Number Drill 16 (4.5 mm)
1/4 0.1860 20 0.05 Number Drill 9 (5.1 mm)
5/16 0.2414 18 0.0556 Letter Drill F (6.5 mm)
3/8 0.2950 16 0.0625 5/16 in (7.94 mm)
7/16 0.3460 14 0.0714 Letter Drill U (9.3 mm)
1/2 0.3933 12 0.0833 Letter Drill Z (10.5 mm)

text: British Standard Whitworth
List of thread sizes
Whitworth thread sizes
Whitworth_size_in Core_diameter_in Threads_per_inch Pitch_in Tapping_drill_size_
9/16 0.4558 12 0.0833 12.1 mm (0.4764 in)
5/8 0.5086 11 0.0909 13.5 mm (0.5315 in)
11/16 0.5711 11 0.0909 15 mm (0.5906 in)
3/4 0.6219 10 0.1 16.27 mm (0.6406 in)
13/16 0.6845 10 0.1 18 mm (0.7087 in)
7/8 0.7327 9 0.1111 19.25 mm (0.7579 in)
15/16 0.7953 9 0.1111 20.75 mm (0.8169 in)
1 0.8399 8 0.125 22 mm (0.8661 in)
1 1/8 0.9420 7 0.1429 
1 1/4 1.0670 7 0.1429 
1 1/2 1.2866 6 0.1667 
1 3/4 1.4939 5 0.2 
2 1.7154 4.5 0.2222 
2 1/2 2.180 4 0.250

Question: What is the highest threads per inch for British Standard Whitworth?

Question: What is the smallest core diameter -lrb- in -rrb- under British Standard Whitworth?