STANDARD DRILL SIZES / MILLIMETER SIZES

(Typical tolerances of drilled holes at bottom of page)

Drill size-Decimal Inch-Millimeter
 
Millimeter Drill-Decimal Inch
Drill
Decimal
mm
 
Drill
Decimal
mm
 
Drill
Decimal
mm
 
mm
Decimal
mm
Decimal
mm
Decimal
#80
.0135
0.34
 
1/8
.1250
3.18
 
O
.3160
8.03
 
0.35
.0138
3.40
.1339
8.00
.3160
#79
.0145
0.37
 
#30
.1285
3.26
 
P
.3230
8.20
 
0.40
.0157
3.50
.1378
8.10
.3189
1/64
.0156
0.40
 
#29
.1360
3.45
 
21/64
.3281
8.33
 
0.45
.0177
3.60
.1417
8.20
.3228
#78
.0160
0.41
 
#28
.1405
3.57
 
Q
.3320
8.43
 
0.50
.0197
3.70
.1457
8.25
.3248
#77
.0180
0.46
 
9/64
.1406
3.57
 
R
.3390
8.61
 
0.55
.0217
3.75
.1477
8.30
.3267
#76
.0200
0.51
 
#27
.1440
3.66
 
11/32
.3437
8.73
 
0.60
.0236
3.80
.1496
8.40
.3307
#75
.0210
0.53
 
#26
.1470
3.73
 
S
.3480
8.84
 
0.65
.0256
3.90
.1535
8.50
.3346
#74
.0225
0.57
 
#25
.1495
3.80
 
T
.3580
9.09
 
0.70
.0276
4.00
.1575
8.60
.3386
#73
.0240
0.61
 
#24
.1520
3.86
 
23/64
.3594
9.13
 
0.75
.0295
4.10
.1614
8.70
.3425
#72
.0250
0.64
 
#23
.1540
3.91
 
U
.3680
9.35
 
0.80
.0315
4.20
.1654
8.75
.3445
#71
.0260
0.66
 
5/32
.1562
3.97
 
3/8
.3750
9.53
 
0.85
.0335
4.25
.1674
8.80
.3465
#70
.0280
0.71
 
#22
.1570
3.99
 
V
.3770
9.58
 
0.90
.0754
4.30
.1693
8.90
.3504
#69
.0292
0.74
 
#21
.1590
4.04
 
W
.3860
9.80
 
0.95
.0374
4.40
.1732
9.00
.3543
#68
.0310
0.79
 
#20
.1610
4.09
 
25/64
.3906
9.92
 
1.00
.0394
4.50
.1771
9.10
.3583
1/32
.0313
0.80
 
#19
.1660
4.22
 
X
.3970
10.08
 
1.05
.0413
4.60
.1811
9.20
.3622
#67
.0320
0.81
 
#18
.1695
4.31
 
Y
.4040
10.26
 
1.10
.0433
4.70
.1850
9.25
.3642
#66
.0330
0.84
 
11/64
.1719
4.37
 
13/32
.4062
10.32
 
1.15
.0453
4.75
.1870
9.30
.3661
#65
.0350
0.89
 
#17
.1730
4.39
 
Z
.4130
10.49
 
1.20
.0472
4.80
.1890
9.40
.3701
#64
.0360
0.91
 
#16
.1770
4.50
 
27/64
.4219
10.72
 
1.25
.0492
4.90
.1929
9.50
.3740
#63
.0370
0.94
 
#15
.1800
4.57
 
7/16
.4375
11.11
 
1.30
.0512
5.00
.1968
9.60
.3780
#62
.0380
0.97
 
#14
.1820
4.62
 
29/64
.4531
11.51
 
1.35
.0531
5.10
.2008
9.70
.3819
#61
.0390
0.99
 
#13
.1850
4.70
 
15/32
.4687
11.90
 
1.40
.0551
5.20
.2047
9.75
.3839
#60
.0400
1.02
 
3/16
.1875
4.76
 
31/64
.4844
12.30
 
1.45
.4843
5.25
.2067
9.80
.3858
#59
.0410
1.04
 
#12
.1890
4.80
 
1/2
.5000
12.70
 
1.50
.0591
5.30
.2087
9.90
.3898
#58
.0420
1.07
 
#11
.1910
4.85
 
33/64
.5156
13.10
 
1.55
.0610
5.40
.2126
10.00
.3937
#57
.0430
1.09
 
#10
.1935
4.91
 
17/32
.5312
13.49
 
1.60
.0629
5.50
.2165
10.50
.4133
#56
.0465
1.18
 
#9
.1960
4.98
 
35/64
.5469
13.89
 
1.65
.0650
5.60
.2205
11.00
.4331
3/64
.0469
1.19
 
#8
.1990
5.05
 
9/16
.5625
14.29
 
1.70
.0669
5.70
.2244
11.50
.4528
#55
.0520
1.32
 
#7
.2010
5.11
 
37/64
.5781
14.68
 
1.75
.0689
5.75
.2264
12.00
.4724
#54
.0550
1.40
 
13/64
.2031
5.16
 
19/32
.5937
15.08
 
1.80
.0709
5.80
.2283
12.50
.4921
#53
.0595
1.51
 
#6
.2040
5.18
 
39/64
.6094
15.48
 
1.85
.0728
5.90
.2323
13.00
.5118
1/16
.0625
1.59
 
#5
.2055
5.22
 
5/8
.6250
15.88
 
1.90
.0748
6.00
.2362
13.50
.5315
#52
.0635
1.61
 
#4
.2090
5.31
 
41/64
.6406
16.27
 
1.95
.0768
6.10
.2401
14.00
.5512
#51
.0670
1.70
 
#3
.2130
5.41
 
21/32
.6562
16.67
 
2.00
.0787
6.20
.2441
14.50
.5708
#50
.0700
1.78
 
7/32
.2187
5.55
 
43/64
.6719
17.07
 
2.05
.0807
6.25
.2461
15.00
.5906
#49
.0730
1.85
 
#2
.2210
5.61
 
11/16
.6875
17.46
 
2.10
.0827
6.30
.2480
15.50
.6102
#48
.0760
1.93
 
#1
.2280
5.79
 
45/64
.7031
17.86
 
2.15
.0846
6.40
.2S20
16.00
.6300
5/64
.0781
1.98
 
A
.2340
5.94
 
23/32
.7187
18.25
 
2.20
.0866
6.50
.2559
16.50
.6496
#47
.0785
1.99
 
15/64
.2344
5.95
 
47/64
.7344
18.65
 
2.25
.0886
6.60
.2598
17.00
.6693
#46
.0810
2.06
 
B
.2380
6.05
 
3/4
.7500
19.05
 
2.30
.0905
6.70
.2638
17.50
.6889
#45
.0820
2.08
 
C
.2420
6.15
 
49/64
.7656
19.45
 
2.35
.0925
6.75
.2658
18.00
.7087
#44
.0860
2.18
 
D
.2460
6.25
 
25/32
.7812
19.84
 
2.40
.0945
6.80
.2677
18.50
.7283
#43
.0890
2.26
 
E
.2500
6.35
 
51/64
.7969
20.24
 
2.45
.0965
6.90
.2716
19.00
.7480
#42
.0935
2.37
 
1/4
.2500
6.35
 
13/16
.8125
20.64
 
2.50
.0984
7.00
.2756
19.50
.7677
3/32
.0937
2.38
 
F
.2570
6.53
 
53/64
.8281
21.03
 
2.55
.1004
7.10
.2795
20.00
.7874
#41
.0960
2.44
 
G
.2610
6.63
 
27/32
.8437
21.43
 
2.60
.1024
7.20
.2835
20.50
.8071
#40
.0980
2.49
 
17/64
.2656
6.75
 
55/64
.8594
21.83
 
2.65
.1043
7.25
.2855
21.00
.8268
#39
.0995
2.53
 
H
.2660
6.76
 
7/8
.8750
22.23
 
2.70
.1063
7.30
.2874
21.50
.8465
#38
.1015
2.58
 
I
.2720
6.91
 
57/64
.8906
22.62
 
2.75
.1083
7.40
.2913
22.00
.8661
#37
.1040
2.64
 
J
.2770
7.04
 
29/32
.9062
23.02
 
2.80
.1102
7.50
.2953
22.50
.8858
#36
.1065
2.71
 
K
.2811
7.14
 
59/64
.9219
23.42
 
2.90
.1142
7.60
.299
23.00
.9055
7/64
.1093
2.78
 
9/32
.2812
7.14
 
15/16
.9375
23.81
 
3.00
.1181
7.70
.3031
23.50
.9252
#35
.1100
2.79
 
L
.2900
7.37
 
61/64
.9531
24.21
 
3.10
.1220
7.75
.3051
24.00
.9449
#34
.1110
2.82
 
14
.2950
7.49
 
31/32
.9687
24.60
 
3.20
.1260
7.80
.3071
24.50
.9646
#33
.1130
2.87
 
19/64
.2968
7.54
 
63/64
.9844
25.00
 
3.25
.1280
7.90
.3110
25.00
.9843
#32
.1160
2.95
 
N
.3020
7.67
 
1"
1.000
25.40
 
3.30
.1299
 
 
25.40
1.000
#31
.1200
3.05
 
5/16
.3125
7.94
 
 
 
 
             

HOLE DIAMETER TOLERANCE DEPEND UPON THE DIAMETER OF THE HOLE AND INCREASE AS THE DIAMETER INCREASES.

.0135 THRU .125   +.004/ -.001
.1260 THRU .25   +.005/ -.001
.2510 THRU .500   +.006/-.001
.5010 THRU .750   +.008/ -.001
.7510 THRU 1.000   +.010/ -.001
1 .001  THRU 2.000   +.012/ -.001

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