Recommended Tapping Drill Size

ISO Metric Coarse

Size (mm)	Pitch (mm)	Drill (mm)
M1	.25	.75
M1.1	.25	.85
M1.2	.25	.95
M1.4	.3	1.1
M1.6	.35	1.25
M1.8	.35	1.45
M2	.4	1.6
M2.2	.45	1.75
M2.5	.45	2.05
M3	.5	2.5
M3.5	.6	2.9
M4	.7	3.3
M4.5	.75	3.75
M5	.8	4.2
M6	1	5
M7	1	6
M8	1.25	6.75
M9	1.25	7.75
M10	1.5	8.5
M11	1.5	9.5
M12	1.75	10.2
M14	2	12
M16	2	14
M18	2.5	15.5
M20	2.5	17.5
M22	2.5	19.5
M24	3	21
M27	3	24
M30	3.5	26.5
M33	3.5	29.5
M36	4	32
M39	4	35
M42	4.5	37.5
M45	4.5	40.5
M48	5	43
M52	5	47
M56	5.5	50.5
M60	5.5	54.5
M64	6	58
M68	6	62
M72	6	66
M76	6	70

UNC

Size No. or inch	Pitch TPI	Drill (mm)
#1	64	1.55
#2	56	1.85
#3	48	2.1
#4	40	2.35
#5	40	2.65
#6	32	2.85
#8	32	3.5
#10	24	3.9
#12	24	4.5
1/4	20	5.1
5/16	18	6.6
3/8	16	8
7/16	14	9.4
1/2	13	10.8
9/16	12	12.2
5/8	11	13.5
3/4	10	16.5
7/8	9	19.5
1	8	22.25
1 1/8	7	25
1 1/4	7	28
1 3/8	6	30.75
1 1/2	6	34
1 3/4	5	39.5
2	4.5	45
2 1/4	4.5	51.5
2 1/2	4	57.25
2 3/4	4	63.5
3	4	70

UNF

Size No. or inch	Pitch TPI	Drill (mm)
#0	80	1.25
#1	72	1.55
#2	64	1.9
#3	56	2.15
#4	48	2.4
#5	44	2.7
#6	40	2.95
#8	36	3.5
#10	32	4.1
#12	28	4.7
1/4	28	5.5
5/16	24	6.9
3/8	24	8.5
7/16	20	9.9
1/2	20	11.5
9/16	18	12.9
5/8	18	14.5
3/4	16	17.5
7/8	14	20.4
1	12	23.25
1 1/8	12	26.5
1 1/4	12	29.5
1 3/8	12	32.75
1 1/2	12	36

ISO Metric Fine

Size (mm)	Pitch (mm)	Drill (mm)
M2	.25	1.75
M2.2	.25	1.95
M2.3	.25	2.05
M2.5	.35	2.15
M2.6	.35	2.25
M3	.35	2.65
M3.5	.35	3.15
M4	.35	3.65
M4	.5	3.5
M5	.35	4.65
M5	.5	4.5
M5	.75	4.25
M5.5	.5	5
M6	.5	5.5
M6	.75	5.25
M7	.75	6.25
M8	.5	7.5
M8	.75	7.25
M8	1	7
M9	.75	8.25
M9	1	8
M10	.5	9.5
M10	.75	9.25
M10	1	9
M10	1.25	8.75
M11	.75	10.25
M11	1	10
M11	1.25	9.75
M12	.5	11.5
M12	.75	11.25
M12	1	11
M12	1.25	10.75
M12	1.5	10.5
M14	1	13
M14	1.25	12.75
M14	1.5	12.5
M15	.75	14.25
M15	1	14
M15	1.5	13.5
M16	.5	15.5
M16	.75	15.25
M16	1	15
M16	1.25	14.75
M16	1.5	14.5
M17	1	16
M17	1.5	15.5
M18	.75	17.25
M18	1	17
M18	1.25	16.75
M18	1.5	16.5
M18	2	16
M19	1	18
M20	1	19
M20	1.5	18.5
M20	2	18
M22	1	21
M22	1.5	20.5
M22	2	20
M24	1	23
M24	1.5	22.5
M24	2	22
M25	1	24
M25	1.5	23.5
M25	2	23
M27	1	26
M27	1.5	25.5
M27	2	25
M28	1	27
M28	1.5	26.5
M28	2	26
M30	1	29
M30	1.5	28.5
M30	2	28
M30	3	27
M32	1	31
M32	1.5	30.5
M32	2	30
M33	1.5	31.5
M33	2	31
M33	3	30
M35	1.5	33.5
M35	2	33
M35	3	32
M36	1	35
M36	1.5	34.4
M36	2	34
M36	3	33
M38	1	37
M38	1.5	36.5
M38	2	36
M39	1.5	37.5
M39	2	37
M39	3	36
M40	1	39
M40	1.5	38.5
M40	3	37
M42	1.5	40.5
M42	2	40
M42	3	39
M42	4	38
M45	1.5	43.5
M45	2	43
M45	3	42
M48	1.5	46.5
M48	2	46
M48	3	45
M48	4	44
M50	1.5	48.5
M50	2	48
M50	3	47
M52	1.5	50.5
M52	2	50
M52	3	49
M52	4	48
M56	2	54
M56	4	52

*All information is strictly informative

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