• June 21, 2024
  • Shatou, Changan, Dongguan, CN
CNC machined standard drills

Standard Drill Sizes for CNC Machining (Conversion Table)

CNC machining is a high-precision machining method that can accurately cut and process workpieces through a computer control system. In the CNC machining process, the drill bit is one of the commonly used tools for drilling holes in the workpiece, and different drilling sizes are suitable for different applications and requirements.

In order to facilitate users to choose the appropriate drill size during CNC machining, the following standard conversion table (metric system, fractional imperial system and wire gauge) can provide reference.

Standard metric drill bit sizes

Drill sizeDiameter (in)Drill sizeDiameter (in)
0.05 mm0.00207.9 mm0.3110
0.1 mm0.00398 mm0.3150
0.2 mm0.00798.1 mm0.3189
0.3 mm0.01188.2 mm0.3228
0.4 mm0.01588.3 mm0.3268
0.5 mm0.01978.4 mm0.3307
0.6 mm0.02368.5 mm0.3347
0.7 mm0.02768.6 mm0.3386
0.8 mm0.03158.7 mm0.3425
0.9 mm0.03548.8 mm0.3465
1 mm0.03948.9 mm0.3504
1.1 mm0.04339 mm0.3543
1.2 mm0.04729.1 mm0.3583
1.3 mm0.05129.2 mm0.3622
1.4 mm0.05519.3 mm0.3661
1.5 mm0.05919.4 mm0.3701
1.6 mm0.06309.5 mm0.3740
1.7 mm0.06699.6 mm0.3780
1.8 mm0.07099.7 mm0.3819
1.9 mm0.07489.8 mm0.3858
2 mm0.07879.9 mm0.3898
2.1 mm0.082710 mm0.3937
2.2 mm0.086610.5 mm0.4134
2.3 mm0.090611 mm0.4331
2.4 mm0.094511.5 mm0.4528
2.5 mm0.09812 mm0.4724
2.6 mm0.102412.5 mm0.4921
2.7 mm0.106313 mm0.5118
2.8 mm0.110213.5 mm0.5315
2.9 mm0.114214 mm0.5512
3 mm0.118114.5 mm0.5709
3.1 mm0.122115 mm0.5906
3.2 mm0.126015.5 mm0.6102
3.3 mm0.129916 mm0.6299
3.4 mm0.133916.5 mm0.6496
3.5 mm0.137817 mm0.6693
3.6 mm0.141717.5 mm0.6890
3.7 mm0.145718 mm0.7087
3.8 mm0.149618.5 mm0.7284
3.9 mm0.15319 mm0.7480
4 mm0.157519.5 mm0.7677
4.1 mm0.161420 mm0.7874
4.2 mm0.165420.5 mm0.8071
4.3 mm0.169321 mm0.8268
4.4 mm0.173221.5 mm0.8465
4.5 mm0.177222 mm0.8661
4.6 mm0.181122.5 mm0.8858
4.7 mm0.185023 mm0.9055
4.8 mm0.189023.5 mm0.9252
4.9 mm0.192924 mm0.9449
5 mm0.196924.5 mm0.9646
5.1 mm0.200825 mm0.9843
5.2 mm0.204725.5 mm1.0039
5.3 mm0.208726 mm1.0236
5.4 mm0.212626.5 mm1.0433
5.5 mm0.216527 mm1.0630
5.6 mm0.220527.5 mm1.0827
5.7 mm0.224428 mm1.1024
5.8 mm0.228428.5 mm1.1221
5.9 mm0.232329 mm1.1417
6 mm0.236229.5 mm1.1614
6.1 mm0.240230 mm1.1811
6.2 mm0.244130.5 mm1.2008
6.3 mm0.248031 mm1.2205
6.4 mm0.252031.5 mm1.2402
6.5 mm0.255932 mm1.2598
6.6 mm0.259832.5 mm1.2795
6.7 mm0.263833 mm1.2992
6.8 mm0.267733.5 mm1.3189
6.9 mm0.271734 mm1.3386
7 mm0.275634.5 mm1.3583
7.1 mm0.279535 mm1.3780
7.2 mm0.283535.5 mm1.3976
7.3 mm0.287436 mm1.4173
7.4 mm0.291336.5 mm1.4370
7.5 mm0.295337 mm1.4567
7.6 mm0.299237.5 mm1.4764
7.7 mm0.303238 mm1.4961
7.8 mm0.3071

Fractional inch drill bit sizes

Drill sizeDiameter (in)Diameter (mm)
1/64 in0.01560.3969
1/32 in0.03130.7938
3/64 in0.04691.1906
1/16 in0.06251.5875
5/64 in0.07811.9844
3/32 in0.09382.3813
7/64 in0.10942.7781
1/8 in0.12503.1750
9/64 in0.14063.5719
5/32 in0.15633.9688
11/64 in0.17194.3656
3/16 in0.18754.7625
13/64 in0.20315.1594
7/32 in0.21885.5563
15/64 in0.23445.9531
1/4 in0.25006.3500
17/64 in0.26566.7469
9/32 in0.28137.1438
19/64 in0.29697.5406
5/16 in0.31257.9375
21/64 in0.32818.3344
11/32 in0.34388.7313
23/64 in0.35949.1281
3/8 in0.37509.5250
25/64 in0.39069.9219
13/32 in0.406310.3188
27/64 in0.421910.7156
7/16 in0.437511.1125
29/64 in0.453111.5094
15/32 in0.468811.9063
31/64 in0.484412.3031
1/2 in0.500012.7000
33/64 in0.515613.0969
17/32 in0.531313.4938
35/64 in0.546913.8906
9/16 in0.562514.2875
37/64 in0.578114.6844
19/32 in0.593815.0813
39/64 in0.609415.4781
5/8 in0.625015.8750
41/64 in0.640616.2719
43/64 in0.671917.0656
11/16 in0.687517.4625
45/64 in0.703117.8594
23/32 in0.718818.2563
47/64 in0.734418.6531
3/4 in0.750019.0500
49/64 in0.765619.4469
25/32 in0.781319.8438
51/64 in0.796920.2406
13/16 in0.812520.6375
53/64 in0.828121.0344
27/32 in0.843821.4313
55/64 in0.859421.8281
7/8 in0.875022.2250
57/64 in0.890622.6219
29/32 in0.906323.0188
21/23 in0.913023.1913
59/64 in0.921923.4156
15/16 in0.937523.8125
61/64 in0.953124.2094
31/32 in0.968824.6063
63/64 in0.984425.0031
1 in1.000025.4000
1 1/64 in1.015625.7969
1 1/32 in1.031326.1938
1 3/64 in1.046926.5906
1 1/16 in1.062526.9875
1 5/64 in1.078127.3844
1 3/32 in1.093827.7813
1 7/64 in1.109428.1781
1 1/8 in1.125028.5750
1 9/64 in1.140628.9719
1 5/32 in1.156329.3688
1 11/64 in1.171929.7656
1 3/16 in1.187530.1625
1 13/64 in1.203130.5594
1 7/32 in1.218830.9563
1 15/64 in1.234431.3531
1 1/4 in1.250031.7500
1 17/64 in1.265632.1469
1 9/32 in1.281332.5438
1 19/64 in1.296932.9406
1 5/16 in1.312533.3375
1 21/64 in1.328133.7344
1 11/32 in1.343834.1313
1 23/64 in1.359434.5281
1 3/8 in1.375034.9250
1 25/64 in1.390635.3219
1 13/32 in1.406335.7188
1 27/64 in1.421936.1156
1 7/16 in1.437536.5125
1 29/64 in1.453136.9094
1 15/32 in1.468837.3063
1 31/64 in1.484437.7031
1 1/2 in1.500038.1000

Wire gauge drill bit sizes

Drill sizeDiameter (in)Diameter (mm)
#1070.00190.0483
#1060.00230.0584
#1050.00270.0686
#1040.00310.0787
#1030.00350.0889
#1020.00390.0991
#1010.00430.1092
#1000.00470.1194
#990.00510.1295
#980.00550.1397
#970.00590.1499
#960.00630.1600
#950.00670.1702
#940.00710.1803
#930.00750.1905
#920.00790.2007
#910.00830.2108
#900.00870.2210
#890.00910.2311
#880.00950.2413
#870.01000.2540
#860.01050.2667
#850.01100.2794
#840.01150.2921
#830.01200.3048
#820.01250.3175
#810.01300.3302
#800.01350.3429
#790.01450.3680
#780.01600.4064
#770.01800.4572
#760.02000.5080
#750.02100.5334
#740.02250.5715
#730.02400.6096
#720.02500.6350
#710.02600.6604
#700.02800.7112
#690.02920.7417
#680.03100.7874
#670.03200.8128
#660.03300.8382
#650.03500.8890
#640.03600.9144
#630.03700.9398
#620.03800.9652
#610.03900.9906
#600.04001.0160
#590.04101.0414
#580.04201.0668
570.04301.0922
#560.04651.1811
#550.05201.3208
#540.05501.3970
#530.05951.5113
#520.06351.6129
#510.06701.7018
#500.07001.7780
#490.07301.8542
#480.07601.9304
#470.07851.9939
#460.08102.0574
#450.08202.0828
#440.08602.1844
#430.08902.2606
#420.09352.3749
#410.09602.4384
#40.09802.4892
#390.09952.5273
#380.10152.5781
#370.10402.6416
#360.10652.7051
#350.11002.7940
#340.11102.8194
#330.11302.8702
#320.11602.9464
#310.12003.0480
#300.12853.2639
#290.13603.4544
#280.14053.5687
#270.14403.6576
#260.14703.7338
#250.14953.7973
#240.15203.8608
#230.15403.9116
#220.15703.9878
#210.15904.0386
#200.16104.0894
#190.16604.2164
#180.16954.3053
#170.17304.3942
#160.17704.4958
#150.18004.5720
#140.18204.6228
#130.18504.6990
#120.18904.8006
#110.19104.8514
#100.19354.9149
#90.19604.9784
#80.19905.0546
#70.20105.1054
#60.20405.1816
#50.20555.2197
#40.20905.3086
#30.21305.4102
#20.22105.6134
#10.22805.7912
A0.23405.9436
B0.23806.0452
C0.24206.1468
D0.24606.2484
E0.25006.3500
F0.25706.5278
G0.26106.6294
H0.26606.7564
I0.27206.9088
J0.27707.0358
K0.28107.1374
L0.29007.3660
M0.29507.4930
N0.30207.6708
O0.31608.0264
P0.32308.2042
Q0.33208.4328
R0.33908.6106
S0.34808.8392
T0.35809.0932
U0.36809.3472
V0.37709.5758
W0.38609.8044
X0.397010.0838
Y0.404010.2616
Z0.413010.4902

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