Find the Right Drill Bit Every Time with Our Comprehensive Specification Table

September 1, 2023 | By Shane | 1 minute of reading

Straight shank countersink drill bit specification table

180 degrees
Specification	Small Diameter	Large Diameter	Overall Length	Small Diameter Blade Length	Shank Diameter
M3	3.4	6.5	65	13	6.5
M4	4.5	8.0	75	18	8
M5	5.5	9.5	85	22	9.5
M6	6.6	11.0	90	25	11
M8	9.0	14.0	100	28	12
M10	11.0	17.5	110	30	12
M12	14.0	20.0	115	32	12
1/4	6.85	11.0	90	25	11
5/16	8.55	14.0	100	28	12
3/8	10.1	15.0	110	30	12
1/2	13.5	20.0	115	32	12

90 degrees
Specification	Small Diameter	Large Diameter	Overall Length	Small Diameter Blade Length	Shank Diameter
M3	3.4	6.4	65	35	6.4
M4	4.5	8.4	75	42	8.4
M5	5.5	10.4	85	50	10.4
M6	6.6	12.5	90	53	12.0
M8	9.0	16.5	100	53	12.0

Center drill bit specification table

Blade diameter (d)	Blade diameter tolerance	Blade length (L2)	Shank diameter (D)	Overall length (L)
0.4	0.05 -0.05	0.5	3.0	31
0.4	0.05 -0.05	0.5
0.5	0.05 -0.05	0.6	3.0	31
0.5	0.05 -0.05	0.6
0.6	0.05 -0.05	0.7	3.5	36
0.6	0.05 -0.05	0.7
0.7	0.05 -0.05	0.8	3.5	36
0.7	0.05 -0.05	0.8
0.8	0.05 -0.05	0.9	4.0	36
0.8	0.05 -0.05	0.9
0.9	0.05 -0.05	1.0	4.0	36
0.9	0.05 -0.05	1.0
1.0	0.05 -0.05	1.2	4.0	36
1.0	0.05 -0.05	1.2	4.0	100
1.2	0.05 -0.05	1.4	5.0	42
1.2	0.05 -0.05
1.5	0.05 -0.05	1.8	5.0	42
		1.8	5.0	100
		1.8	5.0	150
		1.8	5.0	200
2.0	0.08 -0.08	2.4	5.0	42
		2.4	6.0	100
		2.4	6.0	150
		2.4	6.0	200
2.5	0.08 -0.08	3.0	6.0	47
		3.0	8.0	100
		3.0	8.0	150
		3.0	8.0	200
3.0	0.08 -0.08	3.6	7.7	57
		3.6	10.0	100
		3.6	10.0	150
		3.6	10.0	200
3.2	0.08 -0.08	3.8	7.7	57
3.2	0.08 -0.08
4.0	0.08 -0.08	4.8	10.0	69
		4.8	10.0	100
		4.8	10.0	150
		4.8	10.0	200
5.0	0.12 -0.12	6.0	11.0	69
		6.0	12.0	100
		6.0	12.0	150
		6.0	12.0	200
6.0	0.12 -0.12	8.0	16.0	90
6.0	0.12 -0.12
8.0	0.12 -0.12	10.0	18.0	100
8.0	0.12 -0.12
10.0	0.12 -0.12	12.0	18.0	100
10.0	0.12 -0.12
12.0	0.12 -0.12	15.0	22.0	110
12.0	0.12 -0.12

Code #1-#60

Code	inch	mm
#1	0.228	5.79
#2	0.221	5.61
#3	0.213	5.41
#4	0.209	5.31
#5	0.2055	5.22
#6	0.204	5.18
#7	0.201	5.11
#8	0.199	5.05
#9	0.196	4.98
#10	0.1935	4.91
#11	0.191	4.85
#12	0.189	4.80
#13	0.185	4.70
#14	0.182	4.62
#15	0.18	4.57
#16	0.177	4.50
#17	0.173	4.39
#18	0.1695	4.31
#19	0.166	4.22
#20	0.161	4.09
#21	0.159	4.04
#22	0.157	3.99
#23	0.154	3.91
#24	0.152	3.86
#25	0.1495	3.80
#26	0.147	3.73
#27	0.144	3.66
#28	0.1405	3.57
#29	0.136	3.45
#30	0.1285	3.26
#31	0.12	3.05
#32	0.116	2.95
#33	0.113	2.87
#34	0.111	2.82
#35	0.11	2.79
#36	0.1065	2.71
#37	0.104	2.64
#38	0.1015	2.58
#39	0.0995	2.53
#40	0.098	2.49
#41	0.096	2.44
#42	0.0935	2.37
#43	0.089	2.26
#44	0.086	2.18
#45	0.082	2.08
#46	0.081	2.06
#47	0.0785	1.99
#48	0.076	1.93
#49	0.073	1.85
#50	0.07	1.78
#51	0.067	1.70
#52	0.0635	1.61
#53	0.0595	1.51
#54	0.055	1.40
#55	0.052	1.32
#56	0.0465	1.18
#57	0.043	1.09
#58	0.042	1.07
#59	0.041	1.04
#60	0.04	1.02

Code #A-#Z

Code	inch	mm
#A	0.234	5.94
#B	0.238	6.05
#C	0.242	6.15
#D	0.246	6.25
#E	0.25	6.35
#F	0.257	6.53
#G	0.261	6.63
#H	0.266	6.76
#I	0.272	6.91
#J	0.277	7.04
#K	0.281	7.14
#L	0.29	7.37
#M	0.295	7.49
#N	0.302	7.67
#O	0.316	8.03
#P	0.326	8.28
#Q	0.332	8.43
#R	0.339	8.61
#S	0.348	8.84
#T	0.358	9.09
#U	0.368	9.35
#V	0.377	9.58
#W	0.386	9.80
#X	0.397	10.08
#Y	0.404	10.26
#Z	0.413	10.49

Code #1/16.-#1/2.inch

Code	inch	mm
1/16.	0.0625	1.59
5/64.	0.0781	1.98
3/32.	0.0938	2.38
7/64.	0.1094	2.78
1/8.	0.125	3.18
9/64.	0.1406	3.57
5/32.	0.1563	3.97
11/64.	0.1719	4.37
3/16.	0.1875	4.76
13/64.	0.2031	5.16
7/32.	0.2188	5.56
15/64.	0.2344	5.95
1/4.	0.25	6.35
17/64.	0.2656	6.75
9/32.	0.2812	7.14
19/64.	0.2969	7.54
5/16.	0.3125	7.94
21/64	0.3281	8.33
11/32.	0.3438	8.73
23/64.	0.3594	9.13
3/8.	0.375	9.53
25/64.	0.3906	9.92
13/32.	0.4063	10.32
27/64.	0.4219	10.72
7/16.	0.4375	11.11
29/64.	0.4531	11.51
15/32.	0.4688	11.91
31/64.	0.4844	12.3
1/2.	0.5	12.7

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About The Author

Shane

As the founder of MachineMFG, I have dedicated over a decade of my career to the metalworking industry. My extensive experience has allowed me to become an expert in the fields of sheet metal fabrication, machining, mechanical engineering, and machine tools for metals. I am constantly thinking, reading, and writing about these subjects, constantly striving to stay at the forefront of my field. Let my knowledge and expertise be an asset to your business.

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