Nominal Diameter
Major Diameter mm
Tapping Drill Size mm
TPI
Pitch mm
1/16" - 27 NPT
7.895
6.00
27
0.941
1/8" - 27 NPT
10.242
8.25
1/4" - 18 NPT
13.616
10.70
18
1.411
3/8" - 18 NPT
17.055
14.10
1/2" - 14 NPT
21.223
17.40
14
1.814
3/4" - 14 NPT
26.568
22.60
1" - 11 1/2 NPT
33.228
28.50
11.5
2.209
1 1/4" - 11 1/2 NPT
41.985
37.00
1 1/2" - 11 1/2 NPT
48.054
43.50
2" - 11 1/2 NPT
60.092
55.00
2 1/2" - 8 NPT
72.699
65.50
8
3.175
3" - 8 NPT
88.608
81.50
3 1/2" - 8 NPT
101.316
94.30
4" - 8 NPT
113.973
107.00
5" - 8 NPT
141.300
134.384
6" - 8 NPT
168.275
161.191
8" - 8 NPT
219.075
211.673
10" - 8 NPT
273.050
265.311
12" - 8 NPT
323.850
315.793
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