Tapping Drills for Taps-Drills for tapping

The Tap & Die Co
445 West Green Road
London N15 3PL - UK
Tel:+44 (0)20 88881865
Fax:+44 (0)20 88884613
Email:
sales@tapdie.com
www.tapdie.com

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Established since 1978

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TAPPING DRILLS for TAPS (recommended)
TAP Sizes (standard flute) & Drill Sizes in MM
Note:- TPI = Threads per Inch
©=copyright -‘Technical Data’ shown below can be freely used. This information must NOT be reproduced or published in any article or website, without the written permission of: The Tap & Die Co, London

BRITISH STANDARD WHITWORTH FORM THRCEADS (55^o angle)
DIA.	BSW		BSF		BSB		BSP & BSPT		ME/WHITFORM		BSCon
Sizes	TPI	Drill	TPI	Drill	TPI	Drill	TPI	Drill	TPI	Drill	TPI	Drill
1/16”	60	1.2
3/32”	48	1.9
1/8”	40	2.55					28	8.8	40	2.55
5/32”	32	3.2							40	3.3
3/16”	24	3.7	32	4.0					32, 40	4.0, 4.0
7/32”	24	4.5	28	4.6					40	4.8
1/4”	20	5.1	26	5.3	26	5.3	19	11.8	24,28,32,40	5.3,5.4,5.5,5.5
9/32”	20	5.8	26	6.0	26	5.8			32	6.1
5/16”	18	6.5	22	6.8	26	5.8			24, 32, 40	6.75, 7.0, 7.3
3/8”	16	7.9	20	8.3	26	8.4	19	15.25	24, 32, 40	8.4, 8.6, 8.9
7/16”	14	9.3	18	9.7	26	10.0			20,24,32,40	9.8,10,10.3,10.5
1/2”	12	10.5	16	11.1	26	11.5	14	19.0	20,24,32,40	11.5,11.9,11.9,12	18	11.5
9/16”	12	12.1	16	12.7	26	13.1			20	13.1
5/8”	11	13.5	14	14	26	14.7	14	21.0	20	14.5	18	14.2
11/16”	11	15.1	14	15.5	26	16.5			20	16.2
3/4”	10	16.25	12	16.75	26	17.8	14	24.5	14, 20	17.1, 17.8	16	17.5
7/8”	9	19.25	11	19.75	26	21.0	14	28.25	14,16, 20	20.2, 20.6, 21.0	16	20.6
15/16”	9	20.6	11	21.5
1”	8	22.0	10	22.75	26	24.2	11	30.75	12, 20	23.0, 24.0	16	23.8
1.1/8”	7	24.75	9	25.5	26	27.5
1.1/4”	7	28.0	9	28.5	26	30.5	11	39.5			16	30.1
1.3/8”	6	30.1	8	31.5	26	33.7
1.1/2”	6	33.5	8	34.5	26	36.9	11	45.00			14	36.1
1.5/8”	5	35.7	8	37.7	26	40.0
1.3/4”	5	39	7	41.0	26	43.5	11	51.0
1.7/8”	4.1/2	41.3	7	43.7	26	46.5
2”	4.1/2	44.5	7	47.0	26	49.6	11	57.0

BRITISH STD CYCLE (CEI)
BSCy (60^o)
Sizes	TPI	Drill
1/8”	40	2.65
5/32”	32	3.3
3/16”	32	4.1
1/4”	26	5.6
5/16”	26	7.2
3/8”	26	8.7
7/16”	26	10.3
1/2”	26	11.9
9/16”	20	13.1
9/16”	26	13.5
5/8”	20	14.5
5/8”	26	15.0
3/4”	20	17.8
3/4”	26	18.2

MODEL ENGINEER THREADS (BA + ME + BSB)
DIA	BA (47.1/2^o)				DIA	ME (55^o)		BSB (55^o)
Sizes	Dia	Pitch	TPI	Drill	Sizes	TPI	Drill	TPI	Drill
0	6.0	1.0	25.4	5.1	1/8”	40	2.55
1	5.3	0.9	28.2	4.5	5/32”	32	3.2
2	4.7	0.81	31.4	4.0	5/32”	40	3.3
3	4.1	0.73	34.8	3.4	3/16”	32	4.0
4	3.6	0.66	38.5	3.0	3/16”	40	4.0
5	3.2	0.59	43.0	2.65	7/32”	32
6	2.8	0.53	47.9	2.3	7/32”	40	4.8
7	2.5	0.48	52.9	2.05	1/4”	32	5.5	26	5.3
8	2.2	0.43	59.1	1.8	1/4”	40	5.5
9	1.9	0.39	65.1	1.55	9/32”	32	6.1	26	6.1
10	1.7	0.35	72.6	1.4	9/32”	40
11	1.5	0.31	81.9	1.2	5/16”	32	7.0	26	5.8
12	1.3	0.28	90.9	1.05	5/16”	40	7.3
13	1.2	0.25	102.0	0.98	3/8”	32	8.6	26	8.4
14	1.0	0.23	109.9	0.80	3/8”	40	8.9
15	0.9	0.21	120.5	0.70	7/16”	32	10.3	26	10
16	0.79	0.19	133.3	0.60	7/16”	40	10.5
					1/2”	32	11.9	26	11.5
					9/16”			26	13.1
					5/8”			26	14.7
					3/4”			26	17.8

AMERICAN NATIONAL FORM THREADS (60^o angle)
DIA.	UNC		UNF		NPT & NPS		UNS		DIA	UNC		UNF
Sizes	TPI	Drill	TPI	Drill	TPI	Drill	TPI	Drill	Size No	TPI	Drill	TPI	Drill
1/16”					27	6.3	64	1.2	0			80	1.25
3/32”							48	1.85	1	64	1.55	72	1.55
1/8”					27	8.7	40	2.6	2	56	1.85	64	1.9
5/32”							32 & 40	3.2 & 3.3	3	48	2.1	56	2.15
3/16”							32 & 40	4.0 & 4.0	4	40	2.35	48	2.4
7/32”							24 & 32	4.5 & 4.8	5	40	2.65	44	2.7
1/4”	20	5.1	28	5.5	18	11.1	24 & 32	5.30 & 5.6	6	32	2.85	40	2.95
5/16”	18	6.6	24	6.9			20 & 32	6.7 & 7.2	8	32	3.5	36	3.5
3/8”	16	8.0	24	8.5	18	14.5	20	8.30	10	24	3.9	32	4.1
7/16”	14	9.4	20	9.9			24	10.0	12	24	4.5	28	4.70
1/2”	13	10.8	20	11.5	14	18.0	12 & 24	10.5 & 11.5
9/16”	12	12.2	18	12.9
5/8”	11	13.5	18	14.5			12	13.9
11/16”							11 & 16	15.0 & 15.9
3/4”	10	16.5	16	17.5	14	23.25	12	16.7
7/8”	9	19.5	14	20.4			12	20.2
1”	8	22.25	12	23.25	11.5	29.0	14	23.5
1.1/8”	7	25.0	12	26.5
1.1/4”	7	28.0	12	29.5	11.5	38.0
1.3/8”	6	30.75	12	32.75
1.1/2”	6	34.0	12	36.0
1.3/4”	5	39.5

METRIC FORM THREADS (60^o angle)
MM	Coarse		Fine-special
Sizes	Pitch	Drill	Pitch	Drill
0.8	.19	0.6	(=16BA)	0.6
0.9	.21	0.7	(=15BA)	0.7
1	.25	0.8	(=14BA)	0.8
1.2	.25	1.0
1.3	.28	1.05	(=12BA)	1.05
1.4	.3	1.1
1.5	.3	1.2	(=11BA)	1.2
1.6	.35	1.25
1.7	.35	1.35	(=10BA)	1.4
1.8	.35	1.45
1.9	.39	1.55	(=9BA)	1.55
2	.4	1.60	.45	1.55
2.2			.45	1.75
2.3			.4	1.9
2.5	.45	2.05	.35, .4	2.15, 2.1
2.6			.45	2.15
3	.5	2.5	.35, .45	2.65, 2.55