Drill sizes: fractional, number, letter and metric

Name: Drill sizes: fractional, number, letter and metric
Creator: Simuveliq

Twist drill table with diameters in millimeters and inches, sorted from smallest to largest: fractional, number, letter and metric.

Drill	System	Diameter (mm)	Diameter (in)
#80	Number	0.343	0.0135
#79	Number	0.368	0.0145
1/64″	Fractional	0.397 ✓	0.0156
#78	Number	0.406	0.016
#77	Number	0.457	0.018
#76	Number	0.508	0.02
#75	Number	0.533	0.021
#74	Number	0.571	0.0225
#73	Number	0.61	0.024
#72	Number	0.635	0.025
#71	Number	0.66	0.026
#70	Number	0.711	0.028
#69	Number	0.742	0.0292
#68	Number	0.787	0.031
1/32″	Fractional	0.794 ✓	0.0313
#67	Number	0.813	0.032
#66	Number	0.838	0.033
#65	Number	0.889	0.035
#64	Number	0.914	0.036
#63	Number	0.94	0.037
#62	Number	0.965	0.038
#61	Number	0.991	0.039
1 mm	Metric	1 ✓	0.0394
#60	Number	1.016	0.04
#59	Number	1.041	0.041
#58	Number	1.067	0.042
#57	Number	1.092	0.043
1.1 mm	Metric	1.1 ✓	0.0433
#56	Number	1.181	0.0465
3/64″	Fractional	1.191 ✓	0.0469
1.2 mm	Metric	1.2 ✓	0.0472
1.25 mm	Metric	1.25 ✓	0.0492
1.3 mm	Metric	1.3 ✓	0.0512
#55	Number	1.321	0.052
#54	Number	1.397	0.055
1.4 mm	Metric	1.4 ✓	0.0551
1.5 mm	Metric	1.5 ✓	0.0591
#53	Number	1.511	0.0595
1/16″	Fractional	1.587 ✓	0.0625
1.6 mm	Metric	1.6 ✓	0.063
#52	Number	1.613	0.0635
1.7 mm	Metric	1.7 ✓	0.0669
#51	Number	1.702	0.067
#50	Number	1.778	0.07
1.8 mm	Metric	1.8 ✓	0.0709
#49	Number	1.854	0.073
1.9 mm	Metric	1.9 ✓	0.0748
#48	Number	1.93	0.076
5/64″	Fractional	1.984 ✓	0.0781
#47	Number	1.994	0.0785
2 mm	Metric	2 ✓	0.0787
2.05 mm	Metric	2.05 ✓	0.0807
#46	Number	2.057	0.081
#45	Number	2.083	0.082
2.1 mm	Metric	2.1 ✓	0.0827
#44	Number	2.184	0.086
2.2 mm	Metric	2.2 ✓	0.0866
#43	Number	2.261	0.089
2.3 mm	Metric	2.3 ✓	0.0906
#42	Number	2.375	0.0935
3/32″	Fractional	2.381 ✓	0.0938
2.4 mm	Metric	2.4 ✓	0.0945
#41	Number	2.438	0.096
#40	Number	2.489	0.098
2.5 mm	Metric	2.5 ✓	0.0984
#39	Number	2.527	0.0995
#38	Number	2.578	0.1015
2.6 mm	Metric	2.6 ✓	0.1024
#37	Number	2.642	0.104
2.7 mm	Metric	2.7 ✓	0.1063
#36	Number	2.705	0.1065
7/64″	Fractional	2.778 ✓	0.1094
#35	Number	2.794	0.11
2.8 mm	Metric	2.8 ✓	0.1102
#34	Number	2.819	0.111
#33	Number	2.87	0.113
2.9 mm	Metric	2.9 ✓	0.1142
#32	Number	2.946	0.116
3 mm	Metric	3 ✓	0.1181
#31	Number	3.048	0.12
3.1 mm	Metric	3.1 ✓	0.122
1/8″	Fractional	3.175 ✓	0.125
3.2 mm	Metric	3.2 ✓	0.126
#30	Number	3.264	0.1285
3.3 mm	Metric	3.3 ✓	0.1299
3.4 mm	Metric	3.4 ✓	0.1339
#29	Number	3.454	0.136
3.5 mm	Metric	3.5 ✓	0.1378
#28	Number	3.569	0.1405
9/64″	Fractional	3.572 ✓	0.1406
3.6 mm	Metric	3.6 ✓	0.1417
#27	Number	3.658	0.144
3.7 mm	Metric	3.7 ✓	0.1457
#26	Number	3.734	0.147
#25	Number	3.797	0.1495
3.8 mm	Metric	3.8 ✓	0.1496
#24	Number	3.861	0.152
3.9 mm	Metric	3.9 ✓	0.1535
#23	Number	3.912	0.154
5/32″	Fractional	3.969 ✓	0.1563
#22	Number	3.988	0.157
4 mm	Metric	4 ✓	0.1575
#21	Number	4.039	0.159
#20	Number	4.089	0.161
4.1 mm	Metric	4.1 ✓	0.1614
4.2 mm	Metric	4.2 ✓	0.1654
#19	Number	4.216	0.166
4.3 mm	Metric	4.3 ✓	0.1693
#18	Number	4.305	0.1695
11/64″	Fractional	4.366	0.1719
#17	Number	4.394	0.173
4.4 mm	Metric	4.4 ✓	0.1732
#16	Number	4.496	0.177
4.5 mm	Metric	4.5 ✓	0.1772
#15	Number	4.572	0.18
4.6 mm	Metric	4.6 ✓	0.1811
#14	Number	4.623	0.182
#13	Number	4.699	0.185
4.7 mm	Metric	4.7 ✓	0.185
3/16″	Fractional	4.762 ✓	0.1875
4.8 mm	Metric	4.8 ✓	0.189
#12	Number	4.801	0.189
#11	Number	4.851	0.191
4.9 mm	Metric	4.9 ✓	0.1929
#10	Number	4.915	0.1935
#9	Number	4.978	0.196
5 mm	Metric	5 ✓	0.1969
#8	Number	5.055	0.199
5.1 mm	Metric	5.1 ✓	0.2008
#7	Number	5.105	0.201
13/64″	Fractional	5.159	0.2031
#6	Number	5.182	0.204
5.2 mm	Metric	5.2 ✓	0.2047
#5	Number	5.22	0.2055
5.3 mm	Metric	5.3 ✓	0.2087
#4	Number	5.309	0.209
5.4 mm	Metric	5.4 ✓	0.2126
#3	Number	5.41	0.213
5.5 mm	Metric	5.5 ✓	0.2165
7/32″	Fractional	5.556 ✓	0.2188
5.6 mm	Metric	5.6 ✓	0.2205
#2	Number	5.613	0.221
5.7 mm	Metric	5.7 ✓	0.2244
#1	Number	5.791	0.228
5.8 mm	Metric	5.8 ✓	0.2283
5.9 mm	Metric	5.9 ✓	0.2323
A	Letter	5.944	0.234
15/64″	Fractional	5.953	0.2344
6 mm	Metric	6 ✓	0.2362
B	Letter	6.045	0.238
6.1 mm	Metric	6.1 ✓	0.2402
C	Letter	6.147	0.242
6.2 mm	Metric	6.2 ✓	0.2441
D	Letter	6.248	0.246
6.3 mm	Metric	6.3 ✓	0.248
E	Letter	6.35	0.25
1/4″	Fractional	6.35 ✓	0.25
6.4 mm	Metric	6.4 ✓	0.252
6.5 mm	Metric	6.5 ✓	0.2559
F	Letter	6.528	0.257
6.6 mm	Metric	6.6 ✓	0.2598
G	Letter	6.629	0.261
6.7 mm	Metric	6.7 ✓	0.2638
17/64″	Fractional	6.747	0.2656
H	Letter	6.756	0.266
6.8 mm	Metric	6.8 ✓	0.2677
6.9 mm	Metric	6.9 ✓	0.2717
I	Letter	6.909	0.272
7 mm	Metric	7 ✓	0.2756
J	Letter	7.036	0.277
7.1 mm	Metric	7.1 ✓	0.2795
K	Letter	7.137	0.281
9/32″	Fractional	7.144 ✓	0.2813
7.2 mm	Metric	7.2 ✓	0.2835
7.3 mm	Metric	7.3 ✓	0.2874
L	Letter	7.366	0.29
7.4 mm	Metric	7.4 ✓	0.2913
M	Letter	7.493	0.295
7.5 mm	Metric	7.5 ✓	0.2953
19/64″	Fractional	7.541	0.2969
7.6 mm	Metric	7.6 ✓	0.2992
N	Letter	7.671	0.302
7.7 mm	Metric	7.7 ✓	0.3031
7.8 mm	Metric	7.8 ✓	0.3071
7.9 mm	Metric	7.9 ✓	0.311
5/16″	Fractional	7.938 ✓	0.3125
8 mm	Metric	8 ✓	0.315
O	Letter	8.026	0.316
8.1 mm	Metric	8.1 ✓	0.3189
8.2 mm	Metric	8.2 ✓	0.3228
P	Letter	8.204	0.323
8.3 mm	Metric	8.3 ✓	0.3268
21/64″	Fractional	8.334	0.3281
8.4 mm	Metric	8.4 ✓	0.3307
Q	Letter	8.433	0.332
8.5 mm	Metric	8.5 ✓	0.3346
8.6 mm	Metric	8.6 ✓	0.3386
R	Letter	8.611	0.339
8.7 mm	Metric	8.7 ✓	0.3425
11/32″	Fractional	8.731	0.3438
8.8 mm	Metric	8.8 ✓	0.3465
S	Letter	8.839	0.348
8.9 mm	Metric	8.9 ✓	0.3504
9 mm	Metric	9 ✓	0.3543
T	Letter	9.093	0.358
9.1 mm	Metric	9.1 ✓	0.3583
23/64″	Fractional	9.128	0.3594
9.2 mm	Metric	9.2 ✓	0.3622
9.3 mm	Metric	9.3 ✓	0.3661
U	Letter	9.347	0.368
9.4 mm	Metric	9.4 ✓	0.3701
9.5 mm	Metric	9.5 ✓	0.374
3/8″	Fractional	9.525 ✓	0.375
V	Letter	9.576	0.377
9.6 mm	Metric	9.6 ✓	0.378
9.7 mm	Metric	9.7 ✓	0.3819
9.8 mm	Metric	9.8 ✓	0.3858
W	Letter	9.804	0.386
9.9 mm	Metric	9.9 ✓	0.3898
25/64″	Fractional	9.922	0.3906
10 mm	Metric	10 ✓	0.3937
X	Letter	10.084	0.397
10.1 mm	Metric	10.1 ✓	0.3976
10.2 mm	Metric	10.2 ✓	0.4016
Y	Letter	10.262	0.404
10.3 mm	Metric	10.3 ✓	0.4055
13/32″	Fractional	10.319	0.4063
10.4 mm	Metric	10.4 ✓	0.4094
Z	Letter	10.49	0.413
10.5 mm	Metric	10.5 ✓	0.4134
10.6 mm	Metric	10.6 ✓	0.4173
10.7 mm	Metric	10.7 ✓	0.4213
27/64″	Fractional	10.716	0.4219
10.8 mm	Metric	10.8 ✓	0.4252
10.9 mm	Metric	10.9 ✓	0.4291
11 mm	Metric	11 ✓	0.4331
11.1 mm	Metric	11.1 ✓	0.437
7/16″	Fractional	11.112 ✓	0.4375
11.2 mm	Metric	11.2 ✓	0.4409
11.3 mm	Metric	11.3 ✓	0.4449
11.4 mm	Metric	11.4 ✓	0.4488
11.5 mm	Metric	11.5 ✓	0.4528
29/64″	Fractional	11.509	0.4531
11.6 mm	Metric	11.6 ✓	0.4567
11.7 mm	Metric	11.7 ✓	0.4606
11.8 mm	Metric	11.8 ✓	0.4646
11.9 mm	Metric	11.9 ✓	0.4685
15/32″	Fractional	11.906	0.4688
12 mm	Metric	12 ✓	0.4724
12.1 mm	Metric	12.1 ✓	0.4764
12.2 mm	Metric	12.2 ✓	0.4803
12.3 mm	Metric	12.3 ✓	0.4843
31/64″	Fractional	12.303	0.4844
12.4 mm	Metric	12.4 ✓	0.4882
12.5 mm	Metric	12.5 ✓	0.4921
12.6 mm	Metric	12.6 ✓	0.4961
1/2″	Fractional	12.7 ✓	0.5
12.7 mm	Metric	12.7 ✓	0.5
12.8 mm	Metric	12.8 ✓	0.5039
12.9 mm	Metric	12.9 ✓	0.5079
13 mm	Metric	13 ✓	0.5118
33/64″	Fractional	13.097	0.5156
17/32″	Fractional	13.494	0.5313
13.5 mm	Metric	13.5 ✓	0.5315
35/64″	Fractional	13.891	0.5469
14 mm	Metric	14 ✓	0.5512
9/16″	Fractional	14.287 ✓	0.5625
14.5 mm	Metric	14.5 ✓	0.5709
37/64″	Fractional	14.684	0.5781
15 mm	Metric	15 ✓	0.5906
19/32″	Fractional	15.081	0.5938
39/64″	Fractional	15.478	0.6094
15.5 mm	Metric	15.5 ✓	0.6102
5/8″	Fractional	15.875 ✓	0.625
16 mm	Metric	16 ✓	0.6299
41/64″	Fractional	16.272	0.6406
16.5 mm	Metric	16.5 ✓	0.6496
21/32″	Fractional	16.669	0.6563
17 mm	Metric	17 ✓	0.6693
43/64″	Fractional	17.066	0.6719
11/16″	Fractional	17.462	0.6875
17.5 mm	Metric	17.5 ✓	0.689
45/64″	Fractional	17.859	0.7031
18 mm	Metric	18 ✓	0.7087
23/32″	Fractional	18.256	0.7188
18.5 mm	Metric	18.5 ✓	0.7283
47/64″	Fractional	18.653	0.7344
19 mm	Metric	19 ✓	0.748
3/4″	Fractional	19.05 ✓	0.75
49/64″	Fractional	19.447	0.7656
19.5 mm	Metric	19.5 ✓	0.7677
25/32″	Fractional	19.844	0.7813
20 mm	Metric	20 ✓	0.7874
51/64″	Fractional	20.241	0.7969
20.5 mm	Metric	20.5 ✓	0.8071
13/16″	Fractional	20.637	0.8125
21 mm	Metric	21 ✓	0.8268
53/64″	Fractional	21.034	0.8281
27/32″	Fractional	21.431	0.8438
55/64″	Fractional	21.828	0.8594
7/8″	Fractional	22.225 ✓	0.875
57/64″	Fractional	22.622	0.8906
29/32″	Fractional	23.019	0.9063
59/64″	Fractional	23.416	0.9219
15/16″	Fractional	23.813	0.9375
61/64″	Fractional	24.209	0.9531
31/32″	Fractional	24.606	0.9688
63/64″	Fractional	25.003	0.9844
1″	Fractional	25.4	1

Sorted from smallest to largest. ✓ = exact conversion checked (fractional and metric); number and letter sizes come from BenchReference only.

Source: BenchReference physical standards dataset (benchreference.com/data/), CC BY 4.0; values from the standards cited at benchreference.com/sources/. ↗

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