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BA
(British Association)
SIZE
PITCH (P) mm
TAP
DRILL SIZE (mm)
0
1.00
5.10
1
0.90
4.50
2
0.81
4.00
3
0.73
3.40
4
0.66
3.00
5
0.59
2.65
6
0.53
2.30
7
0.48
2.05
8
0.43
1.80
9
0.39
1.55
10
0.35
1.40
11
0.31
1.20
12
0.28
1.05
13
0.25
0.98
14
0.23
0.80
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