Simple Drill and Tap Chart - British
Every tool site has a Drill and Tap Chart. They are stuffed with lots of useless information and are often so small you need a magnifying glass to read them. Here is a simple and concise version that should be useful on a phone or tablet. These tables are for BRITISH threads and includes British Standard Whitworth (BSW), British Standard Fine (BSF), British Standard Pipe Tapered (BSPT), and British Standard Pipe (BSP). These threads are at a 55o angle and are different then Inch or Metric threads which are typically at 60o. Read up on the difference on Google or the Wikipedia.
Looking for other Tap and Drill Guides?
Click for the Metric Tap and Drill Chart
Click for the Inch (Imperial) Tap and Drill Chart
| Tap and Drill Chart - British Standard Whitworth (BSW) |
| Tap size |
Drill Size (mm) |
Drill Size (inch) |
| 1/16-60 |
1.15 |
#56 |
| 3/32-48 |
1.90 |
- |
| 1/8-40 |
2.60 |
#38 |
| 5/32-32 |
3.20 |
1/8 |
| 3/16-24 |
3.70 |
#27 |
| 7/32-24 |
4.30 |
#19 |
| 1/4-20 |
5.00 |
#9 |
| 5/16-18 |
6.40 |
1/4 |
| 3/8-16 |
8.00 |
5/16 |
| 7/16-14 |
9.40 |
U |
| 1/2-12 |
10.80 |
27/64 |
| 9/16-12 |
12.00 |
15/32 |
| 5/8-11 |
13.50 |
17/32 |
| 11/16-11 |
15.00 |
- |
| 3/4-10 |
17.00 |
21/32 |
| 13/16-10 |
18.00 |
- |
| 7/8-9 |
19.50 |
49/64 |
| 15/16-9 |
20.75 |
- |
| 1 |
22.50 |
7/8 |
| Tap and Drill Chart - British Standard Fine (BSF) |
| Tap size |
Drill Size (mm) |
Drill Size (inch) |
| 3/16-32 |
4.00 |
#22 |
| 7/32-28 |
4.60 |
#15 |
| 1/4-26 |
5.50 |
#3 |
| 9/32-26 |
6.10 |
- |
| 5/16-22 |
6.75 |
17/64 |
| 3/8-20 |
8.33 |
21/64 |
| 7/16-18 |
9.53 |
3/8 |
| 1/2-16 |
11.11 |
7/16 |
| 9/16-16 |
12.70 |
1/2 |
| 5/8-14 |
14.29 |
9/16 |
| 11/16-14 |
14.29 |
- |
| 3/4-12 |
17.07 |
43/64 |
| 13/16-12 |
18.25 |
- |
| 7/8-11 |
19.84 |
25/32 |
| 1 |
23.02 |
29/32 |
| Tap and Drill Chart - British Standard Pipe Tapered (BSPT) |
| Tap size |
Drill Size (mm) |
Drill Size (inch) |
| 1/8-28 |
8.40 |
21/64 |
| 1/4-19 |
11.20 |
7/16 |
| 3/8-19 |
14.75 |
37/64 |
| 3/4-14 |
23.75 |
15/16 |
| 1-11 |
30.00 |
1-11/64 |
| Tap and Drill Chart - British Standard Pipe Parallel (BSP) |
| Tap size |
Drill Size (mm) |
Drill Size (inch) |
| 1/16-28 |
6.60 |
G |
| 1/8-28 |
8.80 |
11/32 |
| 1/4-19 |
11.80 |
29/64 |
| 3/8-19 |
15.25 |
19/32 |
| 1/2-14 |
19.00 |
3/4 |
| 5/8-14 |
21.00 |
53/64 |
| 3/4-14 |
24.50 |
31/32 |
| 7/8-14 |
28.25 |
1-7/64 |
| 1-11 |
30.75 |
1-13/64 |
