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Drill Bit Size Chart

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Drill Bit Size Chart

This chart shows decimal inch equivalents for fractional inch, wire size, letter size and metric drill bits up to two inches in diameter.

SizeDecimal Equivalent SizeDecimal Equivalent SizeDecimal Equivalent SizeDecimal Equivalent
97 0.0059   2.60 mm 0.1024   M 0.295   63/64" 0.9844
96 0.0063   37 0.104   7.50 mm 0.2953   1" 1
95 0.0067   2.70 mm 0.1063   19/64" 0.2969   25.50 mm 1.0039
94 0.0071   36 0.1065   7.60 mm 0.2992   1-1/64" 1.0156
93 0.0075   2.75 mm 0.1083   N 0.302   26.00 mm 1.0236
92 0.0079   7/64" 0.1094   7.70 mm 0.3031   1-1/32" 1.0312
91 0.0083   35 0.11   7.75 mm 0.3051   26.50 mm 1.0433
90 0.0087   2.80 mm 0.1102   7.80 mm 0.3071   1-3/64" 1.0469
89 0.0091   34 0.111   7.90 mm 0.311   1-1/16" 1.0625
88 0.0095   33 0.113   5/16" 0.3125   27.00 mm 1.063
.25 mm 0.0098   2.90 mm 0.1142   8.00 mm 0.315   1-5/64" 1.0781
87 0.01   32 0.116   O 0.316   27.50 mm 1.0827
86 0.0105   3.00 mm 0.1181   8.10 mm 0.3189   1-3/32" 1.0938
85 0.011   31 0.12   8.20 mm 0.3228   28.00 mm 1.1024
84 0.0115   3.10 mm 0.122   P 0.323   1-7/64" 1.1094
.30 mm 0.0118   1/8" 0.125   8.25 mm 0.3248   28.50 mm 1.122
83 0.012   3.20 mm 0.126   8.30 mm 0.3268   1-1/8" 1.125
82 0.0125   3.25 mm 0.128   21/64" 0.3281   1-9/64" 1.1406
.32 mm 0.0126   30 0.1285   8.40 mm 0.3307   29.00 mm 1.1417
81 0.013   3.30 mm 0.1299   Q 0.332   1-5/32" 1.1562
80 0.0135   3.40 mm 0.1339   8.50 mm 0.3346   29.50 mm 1.1614
.35 mm 0.0138   29 0.136   8.60 mm 0.3386   1-11/64" 1.1719
.36 mm 0.0142   3.50 mm 0.1378   R 0.339   30.00 mm 1.1811
79 0.0145   28 0.1405   8.70 mm 0.3425   1-3/16" 1.1875
.38 mm 0.015   9/64" 0.1406   11/32" 0.3438   30.50 mm 1.2008
1/64" 0.0156   3.60 mm 0.1417   8.75 mm 0.3445   1-13/64" 1.2031
.40 mm 0.0157   27 0.144   8.80 mm 0.3465   1-7/32" 1.2188
78 0.016   3.70 mm 0.1457   S 0.348   31.00 mm 1.2205
.42 mm 0.0165   26 0.147   8.90 mm 0.3504   1-15/64" 1.2344
.44 mm 0.0173   3.75 mm 0.1476   9.00 mm 0.3543   31.50 mm 1.2402
.45 mm 0.0177   25 0.1495   T 0.358   1-1/4" 1.25
77 0.018   3.80 mm 0.1496   9.10 mm 0.3583   32.00 mm 1.2598
.46 mm 0.0181   24 0.152   23/64" 0.3594   1-17/64" 1.2656
.48 mm 0.0189   3.90 mm 0.1535   9.20 mm 0.3622   32.50 mm 1.2795
.50 mm 0.0197   23 0.154   9.25 mm 0.3642   1-9/32" 1.2812
76 0.02   5/32" 0.1562   9.30 mm 0.3661   1-19/64" 1.2969
75 0.021   22 0.157   U 0.368   33.00 mm 1.2992
.55 mm 0.0217   4.00 mm 0.1575   9.40 mm 0.3701   1-5/16" 1.3125
74 0.0225   21 0.159   9.50 mm 0.374   33.50 mm 1.3189
.60 mm 0.0236   20 0.161   3/8" 0.375   1-21/64" 1.3281
73 0.024   4.10 mm 0.1614   V 0.377   34.00 mm 1.3386
72 0.025   4.20 mm 0.1654   9.60 mm 0.378   1-11/32" 1.3438
.65 mm 0.0256   19 0.166   9.70 mm 0.3819   34.50 mm 1.3583
71 0.026   4.25 mm 0.1673   9.75 mm 0.3839   1-23/64" 1.3594
.70 mm 0.0276   4.30 mm 0.1693   9.80 mm 0.3858   1-3/8" 1.375
70 0.028   18 0.1695   W 0.386   35.00 mm 1.378
69 0.0292   11/64" 0.1719   9.90 mm 0.3898   1-25/64" 1.3906
.75 mm 0.0295   17 0.173   25/64" 0.3906   35.50 mm 1.3976
68 0.031   4.40 mm 0.1732   10.00 mm 0.3937   1-13/32" 1.4062
1/32" 0.0312   16 0.177   X 0.397   36.00 mm 1.4173
.80 mm 0.0315   4.50 mm 0.1772   Y 0.404   1-27/64" 1.4219
67 0.032   15 0.18   13/32" 0.4062   36.50 mm 1.437
66 0.033   4.60 mm 0.1811   Z 0.413   1-7/16" 1.4375
.85 mm 0.0335   14 0.182   10.50 mm 0.4134   1-29/64" 1.4531
65 0.035   13 0.185   27/64" 0.4219   37.00 mm 1.4567
.90 mm 0.0354   4.70 mm 0.185   11.00 mm 0.4331   1-15/32" 1.4688
64 0.036   4.75 mm 0.187   7/16" 0.4375   37.50 mm 1.4764
63 0.037   3/16" 0.1875   11.50 mm 0.4528   1-31/64" 1.4844
.95 mm 0.0374   4.80 mm 0.189   29/64" 0.4531   38.00 mm 1.4961
62 0.038   12 0.189   15/32" 0.4688   1-1/2" 1.5
61 0.039   11 0.191   12.00 mm 0.4724   1-33/64" 1.5156
1.00 mm 0.0394   4.90 mm 0.1929   31/64" 0.4844   38.50 mm 1.5157
60 0.04   10 0.1935   12.50 mm 0.4921   1-17/32" 1.5312
59 0.041   9 0.196   1/2" 0.5   39.00 mm 1.5354
1.05 mm 0.0413   5.00 mm 0.1969   13.00 mm 0.5118   1-35/64" 1.5469
58 0.042   8 0.199   33/64" 0.5156   39.50 mm 1.5551
57 0.043   5.10 mm 0.2008   17/32" 0.5312   1-9/16" 1.5625
1.10 mm 0.0433   7 0.201   13.50 mm 0.5315   40.00 mm 1.5748
1.15 mm 0.0453   13/64" 0.2031   35/64" 0.5469   1-37/64" 1.5781
56 0.0465   6 0.204   14.00 mm 0.5512   1-19/32" 1.5938
3/64" 0.0469   5.20 mm 0.2047   9/16" 0.5625   40.50 mm 1.5945
1.20 mm 0.0472   5 0.2055   14.50 mm 0.5709   1-39/64" 1.6094
1.25 mm 0.0492   5.25 mm 0.2067   37/64" 0.5781   41.00 mm 1.6142
1.30 mm 0.0512   5.30 mm 0.2087   15.00 mm 0.5906   1-5/8" 1.625
55 0.052   4 0.209   19/32" 0.5938   41.50 mm 1.6339
1.35 mm 0.0531   5.40 mm 0.2126   39/64" 0.6094   1-41/64" 1.6406
54 0.055   3 0.213   15.50 mm 0.6102   42.00 mm 1.6535
1.40 mm 0.0551   5.50 mm 0.2165   5/8" 0.625   1-21/32" 1.6562
1.45 mm 0.0571   7/32" 0.2188   16.00 mm 0.6299   1-43/64" 1.6719
1.50 mm 0.0591   5.60 mm 0.2205   41/64" 0.6406   42.50 mm 1.6732
53 0.0595   2 0.221   16.50 mm 0.6496   1-11/16" 1.6875
1.55 mm 0.061   5.70 mm 0.2244   21/32" 0.6562   43.00 mm 1.6929
1/16" 0.0625   5.75 mm 0.2264   17.00 mm 0.6693   1-45/64" 1.7031
1.60 mm 0.063   1 0.228   43/64" 0.6719   43.50 mm 1.7126
52 0.0635   5.80 mm 0.2283   11/16" 0.6875   1-23/32" 1.7188
1.65 mm 0.065   5.90 mm 0.2323   17.50 mm 0.689   44.00 mm 1.7323
1.70 mm 0.0669   A 0.234   45/64" 0.7031   1-47/64" 1.7344
51 0.067   15/64" 0.2344   18.00 mm 0.7087   1-3/4" 1.75
1.75 mm 0.0689   6.00 mm 0.2362   23/32" 0.7188   44.50 mm 1.752
50 0.07   B 0.238   18.50 mm 0.7283   1-49/64" 1.7656
1.80 mm 0.0709   6.10 mm 0.2402   47/64" 0.7344   45.00 mm 1.7717
1.85 mm 0.0728   C 0.242   19.00 mm 0.748   1-25/32" 1.7812
49 0.073   6.20 mm 0.2441   3/4" 0.75   45.50 mm 1.7913
1.90 mm 0.0748   D 0.246   49/64" 0.7656   1-51/64" 1.7969
48 0.076   6.25 mm 0.2461   19.50 mm 0.7677   46.00 mm 1.811
1.95 mm 0.0768   6.30 mm 0.248   25/32" 0.7812   1-13/16" 1.8125
5/64" 0.0781   1/4" E 0.25   20.00 mm 0.7874   1-53/64" 1.8281
47 0.0785   6.40 mm 0.252   51/64" 0.7969   46.50 mm 1.8307
2.00 mm 0.0787   6.50 mm 0.2559   20.50 mm 0.8071   1-27/32" 1.8438
2.05 mm 0.0807   F 0.257   13/16" 0.8125   47.00 mm 1.8504
46 0.081   6.60 mm 0.2598   21.00 mm 0.8268   1-55/64" 1.8594
45 0.082   G 0.261   53/64" 0.8281   47.50 mm 1.8701
2.10 mm 0.0827   6.70 mm 0.2638   27/32" 0.8438   1-7/8" 1.875
2.15 mm 0.0846   17/64" 0.2656   21.50 mm 0.8465   48.00 mm 1.8898
44 0.086   6.75 mm 0.2657   55/64" 0.8594   1-57/64" 1.8906
2.20 mm 0.0866   H 0.266   22.00 mm 0.8661   1-29/32" 1.9062
2.25 mm 0.0886   6.80 mm 0.2677   7/8" 0.875   48.50 mm 1.9094
43 0.089   6.90 mm 0.2717   22.50 mm 0.8858   1-59/64" 1.9219
2.30 mm 0.0906   I 0.272   57/64" 0.8906   49.00 mm 1.9291
2.35 mm 0.0925   7.00 mm 0.2756   23.00 mm 0.9055   1-15/16" 1.9375
42 0.0935   J 0.277   29/32" 0.9062   49.50 mm 1.9488
3/32" 0.0938   7.10 mm 0.2795   59/64" 0.9219   1-61/64" 1.9531
2.40 mm 0.0945   K 0.281   23.50 mm 0.9252   50.00 mm 1.9685
41 0.096   9/32" 0.2812   15/16" 0.9375   1-31/32" 1.9688
2.45 mm 0.0965   7.20 mm 0.2835   24.00 mm 0.9449   1-63/64" 1.9844
40 0.098   7.25 mm 0.2854   61/64" 0.9531   50.50 mm 1.9882
2.50 mm 0.0984   7.30 mm 0.2874   24.50 mm 0.9646   2" 2
39 0.0995   L 0.29   31/32" 0.9688      
38 0.1015   7.40 mm 0.2913   25.00 mm 0.9843      

b2b lead generation