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Sizes

Standard Letter Drill Sizes Table








Letter size Fractional Decimal Metric
size(inches) Equivalent Equivalent
(in inches) mm

A 15/64 0.234
B 0.238 6.00
C 0.242 6.10
D 0.246 6.20
E 1/4 0.250
F 0.257 6.50
G 0.261 6.60
H 13/64 0.266
I 0.272 6.90
J 0.277 7.00
K 9/32 0.281
L 0.290 7.40
M 0.295 7.50
N 0.302 7.70
O 0.316 8.00
P 0.323 8.20
Q 0.332 8.40
R 0.339 8.60
S 0.348 8.80
T 0.358 9.10
U 0.368 9.30
V 3/8 0.375
W 0.386 9.80
X 0.397 10.10
Y 0.404 10.30
Z 0.413 10.50




FRACT SIZE # SIZE LETTER SIZE METRIC SIZE DECIMAL INCHES
  80     0.0135
  79     0.0145
1/64       0.0156
  78     0.0160
  77     0.0180
      ,5 0.0197
  76     0.0200
  75     0.0210
  74     0.0225
  73     0.0240
  72     0.0250
  71     0.0260
  70     0.0280
  69     0.0292
      ,75 0.0295
  68     0.0310
1/32       0.0312
  67     0.0320
  66     0.0330
  65     0.0350
  64     0.0360
  63     0.0370
  62     0.0380
  61     0.0390
      1 0.0394
  60     0.0400
  59     0.0410
  58     0.0420
  57     0.0430
  56     0.0465
3/64       0.0469
      1,25 0.0492
  55     0.0520
  54     0.0550
      1,5 0.0591
  53     0.0595
1/16       0.0625
  52     0.0635
  51     0.0670
      1,75 0.0689
  50     0.0700
  49     0.0730
  48     0.0760
5/64       0.0781
  47     0.0785
      2 0.0787
  46     0.0810
  45     0.0820
  44     0.0860
      2,25 0.0886
  43     0.0890
  42     0.0935
3/32       0.0938
  41     0.0960
  40     0.0980
      2,5 0.0984
  39     0.0995
  38     0.1015
  37     0.1040
  36     0.1065
      2,75 0.1083
7/64       0.1094
  35     0.1100
  34     0.1110
  33     0.1130
  32     0.1160
      3 0.1181
  31     0.1200
1/8       0.1250
      3,25 0.1280
  30     0.1285
  29     0.1360
      3,5 0.1378
  28     0.1405
9/64       0.1406
  27     0.1440
  26     0.1470
      3,75 0.1476
  25     0.1495
  24     0.1520
  23     0.1540
5/32       0.1562
  22     0.1570
      4 0.1575
  21     0.1590
  20     0.1610
  19     0.1660
      4,25 0.1673
  18     0.1695
11/64       0.1719
  17     0.1730
  16     0.1770
      4,5 0.1772
  15     0.1800
  14     0.1820
  13     0.1850
      4,75 0.1870
3/16       0.1875
  12     0.1890
  11     0.1910
  10     0.1935
  9     0.1960
      5 0.1969
  8     0.1990
  7     0.2010
13/64       0.2031
  6     0.2040
  5     0.2055
      5,25 0.2067
  4     0.2090
  3     0.2130
      5,5 0.2165
7/32       0.2188
  2     0.2210
      5,75 0.2264
  1     0.2280
    A   0.2340
15/64       0.2344
      6 0.2362
    B   0.2380
    C   0.2420
    D   0.2460
      6,25 0.2461
1/4   E   0.2500
      6,5 0.2559
    F   0.2570
    G   0.2610
17/64       0.2656
      6,75 0.2657
    H   0.2660
    I   0.2720
      7 0.2756
    J   0.2770
    K   0.2810
9/32       0.2812
      7,25 0.2854
    L   0.2900
    M   0.2950
      7,5 0.2953
19/64       0.2969
    N   0.3020
      7,75 0.3051
5/16       0.3125
      8 0.3150
    O   0.3160
    P   0.3230
      8,25 0.3248
21/64       0.3281
    Q   0.3320
      8,5 0.3346
    R   0.3390
11/32       0.3438
      8,75 0.3445
    S   0.3480
      9 0.3543
    T   0.3580
23/64       0.3594
      9,25 0.3642
    U   0.3680
      9,5 0.3740
3/8       0.3750
     V   0.3770
      9,75 0.3839
    W   0.3860
25/64       0.3906
      10 0.3937
    X   0.3970
    Y   0.4040
13/32       0.4063
    Z   0.4130
      10,5 0.4134
27/64       0.4219
      11 0.4331
7/16       0.4375
      11,5 0.4528
29/64       0.4531
15/32       0.4688
      12 0.4724
31/64       0.4844
      12,5 0.4921
1/2       0.5000
      13 0.5118
33/64       0.5156
17/32       0.5312
      13,5 0.5315
35/64       0.5469
      14 0.5512
9/16       0.5625
      14,5 0.5709
37/64       0.5781
      15 0.5906
19/32       0.5938
39/64       0.6094
      15,5 0.6102
5/8       0.6250
      16 0.6299
41/64       0.6406
      16,5 0.6496
21/32       0.6562
      17 0.6693
43/64       0.6719
11/16       0.6875
      17,5 0.6890
45/64       0.7031
      18 0.7087
23/32       0.7188
      18,5 0.7283
47/64       0.7344
      19 0.7480
3/4       0.7500
49/64       0.7656
      19,5 0.7677
25/32       0.7813
      20 0.7874
 51/64       0.7969
      20,5 0.8071
13/16       0.8125
      21 0.8268
53/64       0.8281
27/32       0.8438
      21,5 0.8465
55/64       0.8594
      22 0.8661
7/8       0.8750
      22,5 0.8858
57/64       0.8906
      23 0.9055
29/32       0.9062
59/64       0.9219
      23,5 0.9252
15/16       0.9375
      24 0.9449
61/64       0.9531
      24,5 0.9646
31/32       0.9688
      25 0.9843
63/64       0.9844
1       1.0000


Related References:
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UNC UNF Threads Per Inch TPI Threads Per Inch
Wood Screw Pilot Hole Sizes Table
Standard NPT National Pipe Thread Tap Drill Sizes Table
ASTM ISO Metric Thread Sizes and Tap Drill Table
Tapping Drill Size and Clearance Drill Size for Metric Threads
Standard Number Drill Sizes Table
Metric Thread Size Tap Drill Table
Standard Tap Drills Clearance Holes Table
Standard Letter Drill Sizes Table
Standard Drill Sizes Decimal Equivalents Table
Socket Head Cap Screw Sizes Dimension Table
SAE Grade ASTM Bolt Identify Marks Mechanical Properties
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Finished Hex Nut Dimensions
Heavy Hex Nut Dimensions Table
Standard ANSI Type B Flat Washer Sizes
Circumferential Speeds for High Speed Twist Drill Table

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