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11 Different Types Of Taps To Select | Complete Guide
Hand Tapping | How To Guide
| BSF British Standard Fine |
|---|
Nominal
dia. | Threads
per
inch | Tap
drill sizes
mm |
3/16*
7/32*
1/4*
9/32*
5/16* | 32
28
26
26
22 | 4.00
4.60
5.30
6.10
6.80 |
3/8*
7/16*
1/2*
9/16*
| 20
18
16
16 | 8.30
9.70
11.10
12.70
|
5/8*
11/16*
3/4*
7/8*
1* | 14
14
12
11
10 | 14.00
15.50
16.75
19.75
22.75 |
1.1/8*
1.1/4*
1.3/8*
1.1/2* | 9
9
8
8
| 25.50
28.50
31.50
34.50 |
