Besly Cutting Tools, Inc 16200 Woodmint Lane South Beloit IL 61080 815-389-2231    Close

Besly Drill Selector for Cutting Taps
Metric Sizes
Metric Tap Size & TPI Basic Major Dia. Drill Size Decimal Equiv. of Drill % of Thread Probable Oversize (Mean) Prob- able Hole Size Prob- able % of Thread
M1.6 x .35 .0630 1.25mm  .0492 77 .0015 .0507 69
M1.8 x .35 .0709 1.45mm  .0571 77 .0015 .0586 69
M2 x .4 .0787 1/16  .0625 79 .0015 .0640 72
    1.60mm  .0630 77 .0017 .0647 69
    52  .0635 74 .0017 .0652 66
M2.2 x .45 .0866 1.75mm  .0689 77 .0017 .0706 70
M2.5 x .45 .0984 2.05mm  .0807 77 .0019 .0826 69
    46  .0810 76 .0019 .0829 67
    45  .0820 71 .0019 .0839 63
M3 x .5 .1181 40  .0980 79 .0023 .1003 70
    2.50mm  .0984 77 .0023 .1007 68
    39  .0995 73 .0023 .1018 64
M3.5 x .6 .1378 33  .1130 81 .0026 .1156 72
    2.90mm  .1142 77 .0026 .1168 68
    32  .1160 71 .0026 .1186 63
M4 x .7 .1575 3.25mm  .1280 82 .0029 .1309 74
    30  .1285 81 .0029 .1314 73
    3.30mm  .1299 77 .0029 .1328 69
M4.5 x .75 .1772 3.70mm  .1457 82 .0032 .1489 74
    26  .1470 79 .0032 .1502 70
    3.75mm  .1476 77 .0032 .1508 69
    25  .1495 72 .0032 .1527 64
M5 x .8 .1968 4.20mm  .1654 77 .0032 .1686 69
    19  .1660 75 .0032 .1692 68
M6 x 1 .2362 10  .1935 84 .0038 .1973 76
    9  .1960 79 .0038 .1998 71
    5.00mm  .1968 77 .0038 .2006 70
    8  .1990 73 .0038 .2028 65
M7 x 1 .2756 A  .2340 81 .0038 .2378 74
    15/16  .2344 81 .0038 .2382 73
    6.00mm  .2362 77 .0038 .2400 70
    B  .2380 74 .0038 .2418 66
M8 x .1.25 .3150 6.70mm  .2638 80 .0041 .2679 74
    17/64  .2656 77 .0041 .2697 71
    6.75mm  .2657 77 .0041 .2698 71
    H  .2660 77 .0041 .2701 70
    6.80mm  .2677 74 .0041 .2718 68
M8 x 1 .3150 7.00mm  .2756 77 .0041 .2797 69
    J  .2770 74 .0041 .2811 66
M10 x 1.5 .3937 8.40mm  .3307 82 .0044 .3351 76
    Q  .3320 80 .0044 .3364 75
    8.50mm  .3346 77 .0044 .3390 71
M10 x 1.25 .3937 8.70mm  .3425 80 .0046 .3471 73
    11/32  .3438 78 .0046 .3483 71
    8.75mm  .3445 77 .0046 .3491 70
M12 x .1.75 .4724 10.20mm  .4016 79 .0047 .4063 74
    Y  .4040 76 .0047 .4087 71
    13/32  .4062 74 .0047 .4109 69
M12 x 1.25 .4724 27/64  .4219 79 .0047 .4266 72
    10.80mm  .4252 74 .0047 .4299 66
M14 x 2 .5512 15/32  .4688 781 .0048 .4736 76
    12mm  .4724 77 .0048 .4772 72
M14 x 1.5 .5512 12.5mm  .4921 77 .0048 .4969 71
M16 x 2 .6299 35/64  .5469 81 .0049 .5518 76
    14mm  .5512 77 .0049 .5561 72
M16 x 1.5 .6299 14.5mm  .5709 77 .0049 .5758 71
M18 x 2.5 .7087 39/64  .6094 78 .0050 .6144 74
    15.5mm  .6102 77 .0050 .6152 73
M18 x 1.5 .7087 41/64  .6406 89 .0050 .6456 82
    16.5mm  .6496 77 .0050 .6546 70
  . 21/32  .6562 68 .0050 .6612 62
M20 x 2.5 .7874 11/16  .6875 78 .0050 .6925 74
    17.5mm  .6890 77 .0052 .6942 73
M20 x 1.5 .7874 18.5mm  .7283 77 .0052 .7335 70
M22 x 2.5 .8661 49/64  .7656 79 .0052 .7708 75
    19.5mm  .7677 77 .0052 .7729 73
M22 x 1.5 .8661 20.5mm  .8071 77 .0052 .8123 70
M24 x 3 .9449 21mm  .8268 77 .0059 .8327 73
    53/64  .8281 76 .0059 .8340 72
M24 x 2 .9449 22mm  .8661 77 .0059 .8720 71
M27 x 3 1.0630 15/16  .9375 82 .0060 .9435 78
    24mm  .9449 77 .0062 .9511 73
M27 x 2 1.0630 25mm  .9843 77 .0070 .9913 70
    63/64  .9844 77 .0070 .9914 70
M30 x 3.5 1.1811 26.5mm  1.0433 77      
    1-3/64  1.0469 75      
M30 x 2 1.1811 28mm  1.1024 77      
    1-7/64  1.1094 70      
M33 x 3.5 1.2992 1-5/32  1.1562 80      
    29.5mm  1.1614 77      
    1-11/64  1.1719 71      
M33 x 2 1.2992 1-7/32  1.2188 79      
    31mm  1.2205 77      
M36 x 4 1.4173 1-1/4  1.2500 82      
    32mm  1.2598 77      
M36 x 3 1.4173 1-19/64  1.2969 78      
    33mm  1.2992 77      
M39 x 4 1.5354 1-3/8  1.3750 78      
    35mm  1.3780 77      
M39 x 3 1.5354 36mm 1.4173 77      
    1-27/64 1.4219 74      

Copyright 2008 by Besly Cutting Tools, Inc. All Rights Reserved.                           Close