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 55^o angle and are different then Inch or Metric threads which are typically at 60^o. 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