Drill bit size chart

Table of Contents

Drill bit size chart

Drilling is a process of cutting or creating a hole, usually with a drill bit. This can be done for many reasons such as installing an object, cutting an object, or making an opening.

There are many factors that affect how you should choose your drill bit size chart. The first factor is what type of material you plan to work with, as different materials require different types of drills. For example, if you plan on working with metal or stone then you will need a diamond tipped drill; whereas if you plan on working with wood or plastic then a standard steel drill would be sufficient.

The drill bit size chart is an important part of the drilling process, first step is choosing a drill bit size chart. The most common charts are metric and imperial, but there are also charts that use both systems together.

Drill bit size chart

What is the Drill Bit and Tap Size Chart and Why to Use Them?

The holes or screw holes are very common features for custom cnc machined parts, and the most common process to make these holes is drilling process with drill bit and drill drill tap.

Produce hole with right size of drill bit, and produce threads with right size of drill tap, a precise screw hole is finished.

Machinists need a drill bit size chart and drill tape size chart to determine the proper dril bit and tap for a certain screw holes or proper tap for an existing hole.

  • The drill size chart is a list of drill sizes, from the smallest to the largest, for use in drilling holes. The chart is usually arranged by metric and imperial units. It can be found in many different shapes and sizes. The most common form of the drill size chart is a table with each column representing a different drill size and each row representing a different material thickness. The table will have one column for metric drill sizes on the left side of the table and one column for imperial units on the right side of the table.
  • The tap size chart is a table that lists standard size taps, specifying the diameter and thread spacing, for fractional, metric, and screw sizes. Fractional sizes are listed in inches, metric sizes are listed in millimeters following the letter “M”. A screw size number corresponds to a diameter which is larger for a higher screw size. The thread spacing can be coarse or fine, will be listed after the diameter. In the fractional and screw size systems, the thread count is used, measured in threads per inch, such as UNF threads and UNC threads. The metric system uses the thread pitch, which is the distance between threads, measured in millimeters.

Types of Drill Bit Sizes

  1. Metric drill bit sizes: are the most commonly used. They are designated by a number followed by the letter M. The higher the number, the smaller the drill bit.
  2. Letter drill bit sizes: are designated by a letter followed by an abbreviation of the fractional size, such as 1/16.
  3. Number drill bit sizes: are designated with a number followed by a fractional size, such as 1/8.
  4. Fractional drill bit sizes: are designated with a fractional size followed by a letter, such as 3/32 or 3/64.
  5. Decimal drill bit sizes: are designated with numbers from 0 to 9 and fractions of an inch (0 to 9).

List of Drill Bit Size

Drill sizeDiameter (in)Diameter (mm)
#1070.00190.0483
0.05 mm0.00200.0500
#1060.00230.0584
#1050.00270.0686
#1040.00310.0787
#1030.00350.0889
#1020.00390.0991
0.1 mm0.00390.1000
#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
0.2 mm0.00790.2000
#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
0.3 mm0.01180.3000
#830.01200.3048
#820.01250.3175
#810.01300.3302
#800.01350.3429
#790.01450.3680
1/64 in0.01560.3969
0.4 mm0.01580.4000
#780.01600.4064
#770.01800.4572
0.5 mm0.01970.5000
#760.02000.5080
#750.02100.5334
#740.02250.5715
0.6 mm0.02360.6000
#730.02400.6096
#720.02500.6350
#710.02600.6604
0.7 mm0.02760.7000
#700.02800.7112
#690.02920.7417
#680.03100.7874
1/32 in0.03130.7938
0.8 mm0.03150.8000
#670.03200.8128
#660.03300.8382
#650.03500.8890
0.9 mm0.03540.9000
#640.03600.9144
#630.03700.9398
#620.03800.9652
#610.03900.9906
1 mm0.03941.0000
#600.04001.0160
#590.04101.0414
#580.04201.0668
#570.04301.0922
1.1 mm0.04331.1000
#560.04651.1811
3/64 in0.04691.1906
1.2 mm0.04721.2000
1.3 mm0.05121.3000
#550.05201.3208
#540.05501.3970
1.4 mm0.05511.4000
1.5 mm0.05911.5000
#530.05951.5113
1/16 in0.06251.5875
1.6 mm0.06301.6000
#520.06351.6129
1.7 mm0.06691.7000
#510.06701.7018
#500.07001.7780
1.8 mm0.07091.8000
#490.07301.8542
1.9 mm0.07481.9000
#480.07601.9304
5/64 in0.07811.9844
#470.07851.9939
2 mm0.07872.0000
#460.08102.0574
#450.08202.0828
2.1 mm0.08272.1000
#440.08602.1844
2.2 mm0.08662.2000
#430.08902.2606
2.3 mm0.09062.3000
#420.09352.3749
3/32 in0.09382.3813
2.4 mm0.09452.4000
#410.09602.4384
#400.09802.4892
2.5 mm0.09842.5000
#390.09952.5273
#380.10152.5781
2.6 mm0.10242.6000
#370.10402.6416
2.7 mm0.10632.7000
#360.10652.7051
7/64 in0.10942.7781
#350.11002.7940
2.8 mm0.11022.8000
#340.11102.8194
#330.11302.8702
2.9 mm0.11422.9000
#320.11602.9464
3 mm0.11813.0000
#310.12003.0480
3.1 mm0.12213.1000
1/8 in0.12503.1750
3.2 mm0.12603.2000
#300.12853.2639
3.3 mm0.12993.3000
3.4 mm0.13393.4000
#290.13603.4544
3.5 mm0.13783.5000
#280.14053.5687
9/64 in0.14063.5719
3.6 mm0.14173.6000
#270.14403.6576
3.7 mm0.14573.7000
#260.14703.7338
#250.14953.7973
3.8 mm0.14963.8000
#240.15203.8608
3.9 mm0.15353.9000
#230.15403.9116
5/32 in0.15633.9688
#220.15703.9878
4 mm0.15754.0000
#210.15904.0386
#200.16104.0894
4.1 mm0.16144.1000
4.2 mm0.16544.2000
#190.16604.2164
4.3 mm0.16934.3000
#180.16954.3053
11/64 in0.17194.3656
#170.17304.3942
4.4 mm0.17324.4000
#160.17704.4958
4.5 mm0.17724.5000
#150.18004.5720
4.6 mm0.18114.6000
#140.18204.6228
#130.18504.6990
4.7 mm0.18504.7000
3/16 in0.18754.7625
4.8 mm0.18904.8000
#120.18904.8006
#110.19104.8514
4.9 mm0.19294.9000
#100.19354.9149
#90.19604.9784
5 mm0.19695.0000
#80.19905.0546
5.1 mm0.20085.1000
#70.20105.1054
13/64 in0.20315.1594
#60.20405.1816
5.2 mm0.20475.2000
#50.20555.2197
5.3 mm0.20875.3000
#40.20905.3086
5.4 mm0.21265.4000
#30.21305.4102
5.5 mm0.21655.5000
7/32 in0.21885.5563
5.6 mm0.22055.6000
#20.22105.6134
5.7 mm0.22445.7000
#10.22805.7912
5.8 mm0.22845.8000
5.9 mm0.23235.9000
A0.23405.9436
15/64 in0.23445.9531
6 mm0.23626.0000
B0.23806.0452
6.1 mm0.24026.1000
C0.24206.1468
6.2 mm0.24416.2000
D0.24606.2484
6.3 mm0.24806.3000
1/4 in0.25006.3500
E0.25006.3500
6.4 mm0.25206.4000
6.5 mm0.25596.5000
F0.25706.5278
6.6 mm0.25986.6000
G0.26106.6294
6.7 mm0.26386.7000
17/64 in0.26566.7469
H0.26606.7564
6.8 mm0.26776.8000
6.9 mm0.27176.9000
I0.27206.9088
7 mm0.27567.0000
J0.27707.0358
7.1 mm0.27957.1000
K0.28107.1374
9/32 in0.28137.1438
7.2 mm0.28357.2000
7.3 mm0.28747.3000
L0.29007.3660
7.4 mm0.29137.4000
M0.29507.4930
7.5 mm0.29537.5000
19/64 in0.29697.5406
7.6 mm0.29927.6000
N0.30207.6708
7.7 mm0.30327.7000
7.8 mm0.30717.8000
7.9 mm0.31107.9000
5/16 in0.31257.9375
8 mm0.31508.0000
O0.31608.0264
8.1 mm0.31898.1000
8.2 mm0.32288.2000
P0.32308.2042
8.3 mm0.32688.3000
21/64 in0.32818.3344
8.4 mm0.33078.4000
Q0.33208.4328
8.5 mm0.33478.5000
8.6 mm0.33868.6000
R0.33908.6106
8.7 mm0.34258.7000
11/32 in0.34388.7313
8.8 mm0.34658.8000
S0.34808.8392
8.9 mm0.35048.9000
9 mm0.35439.0000
T0.35809.0932
9.1 mm0.35839.1000
23/64 in0.35949.1281
9.2 mm0.36229.2000
9.3 mm0.36619.3000
U0.36809.3472
9.4 mm0.37019.4000
9.5 mm0.37409.5000
3/8 in0.37509.5250
V0.37709.5758
9.6 mm0.37809.6000
9.7 mm0.38199.7000
9.8 mm0.38589.8000
W0.38609.8044
9.9 mm0.38989.9000
25/64 in0.39069.9219
10 mm0.393710.0000
X0.397010.0838
Y0.404010.2616
13/32 in0.406310.3188
Z0.413010.4902
10.5 mm0.413410.5000
27/64 in0.421910.7156
11 mm0.433111.0000
7/16 in0.437511.1125
11.5 mm0.452811.5000
29/64 in0.453111.5094
15/32 in0.468811.9063
12 mm0.472412.0000
31/64 in0.484412.3031
12.5 mm0.492112.5000
1/2 in0.500012.7000
13 mm0.511813.0000
33/64 in0.515613.0969
17/32 in0.531313.4938
13.5 mm0.531513.5000
35/64 in0.546913.8906
14 mm0.551214.0000
9/16 in0.562514.2875
14.5 mm0.570914.5000
37/64 in0.578114.6844
15 mm0.590615.0000
19/32 in0.593815.0813
39/64 in0.609415.4781
15.5 mm0.610215.5000
5/8 in0.625015.8750
16 mm0.629916.0000
41/64 in0.640616.2719
16.5 mm0.649616.5000
17 mm0.669317.0000
43/64 in0.671917.0656
11/16 in0.687517.4625
17.5 mm0.689017.5000
45/64 in0.703117.8594
18 mm0.708718.0000
23/32 in0.718818.2563
18.5 mm0.728418.5000
47/64 in0.734418.6531
19 mm0.748019.0000
3/4 in0.750019.0500
49/64 in0.765619.4469
19.5 mm0.767719.5000
25/32 in0.781319.8438
20 mm0.787420.0000
51/64 in0.796920.2406
20.5 mm0.807120.5000
13/16 in0.812520.6375
21 mm0.826821.0000
53/64 in0.828121.0344
27/32 in0.843821.4313
21.5 mm0.846521.5000
55/64 in0.859421.8281
22 mm0.866122.0000
7/8 in0.875022.2250
22.5 mm0.885822.5000
57/64 in0.890622.6219
23 mm0.905523.0000
29/32 in0.906323.0188
21/23 in0.913023.1913
59/64 in0.921923.4156
23.5 mm0.925223.5000
15/16 in0.937523.8125
24 mm0.944924.0000
61/64 in0.953124.2094
24.5 mm0.964624.5000
31/32 in0.968824.6063
25 mm0.984325.0000
63/64 in0.984425.0031
1 in1.000025.4000
25.5 mm1.003925.5000
1 1/64 in1.015625.7969
26 mm1.023626.0000
1 1/32 in1.031326.1938
26.5 mm1.043326.5000
1 3/64 in1.046926.5906
1 1/16 in1.062526.9875
27 mm1.063027.0000
1 5/64 in1.078127.3844
27.5 mm1.082727.5000
1 3/32 in1.093827.7813
28 mm1.102428.0000
1 7/64 in1.109428.1781
28.5 mm1.122128.5000
1 1/8 in1.125028.5750
1 9/64 in1.140628.9719
29 mm1.141729.0000
1 5/32 in1.156329.3688
29.5 mm1.161429.5000
1 11/64 in1.171929.7656
30 mm1.181130.0000
1 3/16 in1.187530.1625
30.5 mm1.200830.5000
1 13/64 in1.203130.5594
1 7/32 in1.218830.9563
31 mm1.220531.0000
1 15/64 in1.234431.3531
31.5 mm1.240231.5000
1 1/4 in1.250031.7500
32 mm1.259832.0000
1 17/64 in1.265632.1469
32.5 mm1.279532.5000
1 9/32 in1.281332.5438
1 19/64 in1.296932.9406
33 mm1.299233.0000
1 5/16 in1.312533.3375
33.5 mm1.318933.5000
1 21/64 in1.328133.7344
34 mm1.338634.0000
1 11/32 in1.343834.1313
34.5 mm1.358334.5000
1 23/64 in1.359434.5281
1 3/8 in1.375034.9250
35 mm1.378035.0000
1 25/64 in1.390635.3219
35.5 mm1.397635.5000
1 13/32 in1.406335.7188
36 mm1.417336.0000
1 27/64 in1.421936.1156
36.5 mm1.437036.5000
1 7/16 in1.437536.5125
1 29/64 in1.453136.9094
37 mm1.456737.0000
1 15/32 in1.468837.3063
37.5 mm1.476437.5000
1 31/64 in1.484437.7031
38 mm1.496138.0000
1 1/2 in1.500038.1000

https://www.custompartnet.com/drill-size-chart

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