Tap and Drill set
Ratchet Tap
Tap and Die Set

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
Click for Contact Page Click for Contact Page
Above are the Inch Drill charts in HTML format (you can copy and past), Below are the same an a .GIF IMAGES
Tap and Drill Chart - British Standard Whitworth BSW
Tap and Drill Chart - British Standard Fine BSF
Tap and Drill Chart - British Standard Pipe Parallel BSP
Tap and Drill Chart - British Standard Pipe Tapered BSPT