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)

Question: Does any Whitworth size have the same core diameter as the 26 number drill under British Standard Whitworth?

Question: What is the core diameter of the first 1/8 Whitworth size -lrb- in -rrb- under British Standard Whitworth?

Question: What Whitworth size has the same number of threads per inch as 3/16 under British Standard Whitworth?