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Thread: What is the Closest Drill Size?

  1. #1
    rgsparber's Avatar
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    What is the Closest Drill Size?

    Often, I just want to know the closest drill size. Doesn't matter to me if it is fractional, number, letter, or metric. This search occurs often enough that I sat down and found a way that works best for me. Maybe it will help you too.

    If you are interested, please see

    https://rick.sparber.org/FastAccessD...bleArticle.pdf


    Your comments are welcome. All of us are smarter than any one of us.


    Thanks,

    Rick
    Rick

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    mklotz mklotz's Avatar
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    Thanks for that clever technique, Rick. Years ago I made a more conventional chart. Since all the required drill size data was already computerized as part of the work on my webpage, I simply wrote a program to meld all the sizes for all the crazy, inferial drill names with the metric sizes to create a single chart of sequential drill sizes, smallest to largest.

    The chart is shown below. Folks who would like a copy can email me and I'll send one along.

    Code:
    Drill Sizes:
    
      97  0.0059
      96  0.0063
      95  0.0067
      94  0.0071
      93  0.0075
      92  0.0079
      91  0.0083
      90  0.0087
      89  0.0091
      88  0.0095
      87  0.0100
      86  0.0105
      85  0.0110
      84  0.0115
      83  0.0120
      82  0.0125
      81  0.0130
      80  0.0135
      79  0.0145
     1/64..........  0.0156
      78  0.0160
      77  0.0180
      76  0.0200
      75  0.0210
      74  0.0225
      73  0.0240
      72  0.0250 000-120
      71  0.0260
      70  0.0280
      69  0.0292
      68  0.0310
    1/32........  0.0313
    0.8 mm  0.0315
      67  0.0320
      66  0.0330
      65  0.0350
    0.9 mm  0.0354
      64  0.0360 00-90  
      63  0.0370
      62  0.0380
      61  0.0390
    1.0 mm  0.0394
      60  0.0400
      59  0.0410
      58  0.0420
      57  0.0430
    1.1 mm  0.0433
      56  0.0465
     3/64..........  0.0469     0-80
    1.2 mm  0.0472
    1.3 mm  0.0512
      55  0.0520
      54  0.0550 1-56
    1.4 mm  0.0551
    1.5 mm  0.0591
      53  0.0595     1-64,72
      1/16......  0.0625
    1.6 mm  0.0630
      52  0.0635
    1.7 mm  0.0669
      51  0.0670
      50  0.0700     2-56,64
    1.8 mm  0.0709
      49  0.0730
    1.9 mm  0.0748
      48  0.0760
     5/64..........  0.0781
      47  0.0785 3-48
    2.0 mm  0.0787
      46  0.0810
      45  0.0820     3-56,4-32 
    2.1 mm  0.0827
      44  0.0860     4-36
    2.2 mm  0.0866
      43  0.0890     4-40
    2.3 mm  0.0906
      42  0.0935     4-48
    3/32........  0.0938
    2.4 mm  0.0945
      41  0.0960
      40  0.0980
    2.5 mm  0.0984
      39  0.0995
      38  0.1015     5-40
    2.6 mm  0.1024
      37  0.1040     5-44
    2.7 mm  0.1063
      36  0.1065     6-32
     7/64..........  0.1094
      35  0.1100
    2.8 mm  0.1102
      34  0.1110     6-36
      33  0.1130     6-40
    2.9 mm  0.1142
      32  0.1160
    3.0 mm  0.1181
      31  0.1200
    3.1 mm  0.1220
      1/8----  0.1250
    3.2 mm  0.1260
      30  0.1285
    3.3 mm  0.1299
    3.4 mm  0.1339
      29  0.1360     8-32,36
    3.5 mm  0.1378
      28  0.1405      8-40
     9/64..........  0.1406
    3.6 mm  0.1417
      27  0.1440
    3.7 mm  0.1457
      26  0.1470
      25  0.1495     10-24  
    3.8 mm  0.1496
      24  0.1520
    3.9 mm  0.1535
      23  0.1540
    5/32........  0.1562
      22  0.1570     10-30  
    4.0 mm  0.1575
      21  0.1590     10-32  
      20  0.1610
    4.1 mm  0.1614
    4.2 mm  0.1654
      19  0.1660
    4.3 mm  0.1693
      18  0.1695
    11/64..........  0.1719
      17  0.1730
    4.4 mm  0.1732
      16  0.1770 12-24  
    4.5 mm  0.1772
      15  0.1800
    4.6 mm  0.1811
      14  0.1820     12-28  
    13-4.7 mm  0.1850     12-32  
      3/16......  0.1875
    12-4.8 mm  0.1890
      11  0.1910
    4.9 mm  0.1929
      10  0.1935
    9  0.1960
    5.0 mm  0.1969
    8  0.1990
    5.1 mm  0.2008
    7  0.2010     1/4-20 
    13/64..........  0.2031
    6  0.2040
    5.2 mm  0.2047
    5  0.2055
    5.3 mm  0.2087
    4  0.2090
    5.4 mm  0.2126
    3  0.2130     1/4-28 
    5.5 mm  0.2165
    7/32........  0.2188
    5.6 mm  0.2205
    2  0.2210
    5.7 mm  0.2244
    1  0.2280
    5.8 mm  0.2283
    5.9 mm  0.2323
    A  0.2340
    15/64..........  0.2344
    6.0 mm  0.2362
    B  0.2380
    6.1 mm  0.2402
    C  0.2420
    6.2 mm  0.2441
    D  0.2460
    6.3 mm  0.2480
     E-1/4  0.2500
    6.4 mm  0.2520
    6.5 mm  0.2559
    F  0.2570     5/16-18
    6.6 mm  0.2598
    G  0.2610
    6.7 mm  0.2638
    17/64..........  0.2656
    H  0.2660
    6.8 mm  0.2677
    6.9 mm  0.2717
    I  0.2720     5/16-24
    7.0 mm  0.2756
    J  0.2770
    7.1 mm  0.2795
    K  0.2810
    9/32........  0.2812
    7.2 mm  0.2835
    7.3 mm  0.2874
    L  0.2900
    7.4 mm  0.2914
    M  0.2950
    7.5 mm  0.2953
    19/64..........  0.2969
    7.6 mm  0.2992
    N  0.3020
    7.7 mm  0.3031
      5/16......  0.3125     3/8-16 
    8.0 mm  0.3150
    O  0.3160
    P  0.3230
    21/64..........  0.3281
    Q  0.3320     3/8-24 
    8.5 mm  0.3346
    R  0.3390
      11/32........  0.3438
    S  0.3480
    9.0 mm  0.3543
    T  0.3580
    23/64..........  0.3594
    U  0.3680     7/16-14
    9.5 mm  0.3740
      3/8----  0.3750
    V  0.3770
    W  0.3860
    25/64..........  0.3906     7/16-20
      10.0 mm  0.3937
    X  0.3970
    Y  0.4040
      13/32........  0.4062
    Z  0.4130
    27/64..........  0.4219     1/2-13 
      7/16......  0.4375
    29/64..........  0.4531      1/2-20 
      15/32........  0.4688
    31/64..........  0.4844     9/16-12
     1/2  0.5000
    33/64..........  0.5156     9/16-18
      17/32........  0.5313
    35/64..........  0.5469
      9/16......  0.5625
    37/64..........  0.5781
      19/32........  0.5938
    39/64..........  0.6094
      5/8----  0.6250
    41/64..........  0.6406
      21/32........  0.6562
    43/64..........  0.6719
     11/16......  0.6875
    45/64..........  0.7031
      23/32........  0.7188
    47/64..........  0.7344
     3/4==  0.7500
    49/64..........  0.7656
      25/32........  0.7812
    51/64..........  0.7969
     13/16......  0.8125
    53/64..........  0.8281
      27/32........  0.8438
    55/64..........  0.8594
      7/8----  0.8750
    57/64..........  0.8906
      29/32........  0.9062
    59/64..........  0.9219
     15/16......  0.9375
    61/64..........  0.9531
      31/32........  0.9688
    63/64..........  0.9844
    1 in  1.0000
      1-3/64..........  1.0469
      1-7/64..........  1.1094
    1-1/8----  1.1250
     1-11/64..........  1.1719
     1-7/32........  1.2188
      1-1/4==  1.2500
     1-19/64..........  1.2969
    1-11/32........  1.3438
    1-3/8----  1.3750
     1-27/64..........  1.4219
     1-1/2  1.5000
    ---
    Regards, Marv


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  5. #3
    rgsparber's Avatar
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    "Thanks for that clever technique, Rick. Years ago I made a more conventional chart. Since all the required drill size data was already computerized as part of the work on my webpage, I simply wrote a program to meld all the sizes for all the crazy, inferial drill names with the metric sizes to create a single chart of sequential drill sizes, smallest to largest."


    Marv,

    Maybe it is just me, but I'm faster with a two dimensional search than with a linear one.

    Just curious, but did you try out my table with a random hole size?

    Rick
    Rick

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    mklotz mklotz's Avatar
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    Quote Originally Posted by rgsparber View Post
    "Thanks for that clever technique, Rick. Years ago I made a more conventional chart. Since all the required drill size data was already computerized as part of the work on my webpage, I simply wrote a program to meld all the sizes for all the crazy, inferial drill names with the metric sizes to create a single chart of sequential drill sizes, smallest to largest."


    Marv,

    Maybe it is just me, but I'm faster with a two dimensional search than with a linear one.

    Just curious, but did you try out my table with a random hole size?

    Rick
    Yes, I did and it works well.

    Despite many years spent with matrix algebra, my mind remains firmly linear.
    ---
    Regards, Marv


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    Rick and Marv,

    Great set of tables and I made a similar table for finding the best press fit holes sizes under 1/2" dia. I kept in a clear vinyl sleeve.

    However, a few years ago I invested in buying the Calculated Industries Machinist Calc Pro for less than $40 when at sale at Enco. It has an extensive set of calculations and table look-ups. My calculator version is no longer available and they now have a more expensive version that includes specifying the materials to be machined. Nonetheless, I still use the drill size feature the most using the "+" or "-" key to find drill sizes larger or smaller than the exact drill size for press or sliding fits.

    I also like the free Android phone apps "Knurling Calculator" and "Machinist Buddy" (has a lot of calculations and reference tables).

    Regards,
    Paul

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  10. #6
    mklotz mklotz's Avatar
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    My DRILL program from my website does something similar. Below is a sample output hunting a drill to drill a 0.372 hole...

    number of drills read from data file = 371

    D find Drill designation given hole size
    S find hole Size given drill designation
    T find Tapdrill for any tap and dot
    F find tapdrill for thread-Forming tap
    X step drilling calculations
    H display this Help/Menu
    M display this Help/Menu
    Q Quit (Esc also)

    (D,S,T,F,X,H,M,Q) ?

    {[d].dd or [d-]d/d (e.g. 1.5 or 1-1/2)} Hole Size ? 0.372

    (9.25 mm) with size 0.3642 (-0.0078)
    (9.30 mm) with size 0.3661 (-0.0059)
    (U) with size 0.3680 (-0.0040)
    ***** (9.40 mm) with size 0.3701 (-0.0019) *****
    (9.50 mm) with size 0.3740 (+0.0020)
    (3/8) with size 0.3750 (+0.0030)
    (V) with size 0.3770 (+0.0050)

    (D,S,T,F,X,H,M,Q) ?
    ---
    Regards, Marv


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    Thanks Rick! We've added your Drill Size Table to our Measuring and Marking category, as well as to your builder page: Rick's Homemade Tools. Your receipt:



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