STS Industrial - Bolts & Screws

 

LONG LENGTH DRILL BITS

Long length drill bits allow for extended reach while drilling, or extended drilling depths. They are available in varying materials and designs for a wide range of drilling applications. Extension drills have a longer shank and are used to extend reach for hard to access drilling applications. Extra length drills have longer flutes and are meant to allow for deeper drilling, as well as extend reach.

Long Length Drill Bits Picture

  • HIGH SPEED STEEL EXTENSION BITS:

    High speed steel extension drill bits for use in general drilling applications where extended reach is necessary. 6 or 12 inch length drill bits. Shank diameter equal to drill diameter. Fractional and Number sizes. The 135 degree Split Point eliminates walking at the drill point and reduces thrust.

    High Speed Steel Extension Drill Bits

     

    6 INCH EXTENSION BITS

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/16 0.0625   7/8 6
      5/64 0.0781 1 6
      3/32 0.0938 1  1/4 6
      7/64 0.1094 1  1/2 6
      1/8 0.1250 1  5/8 6
      9/64 0.1406 1  3/4 6
      5/32 0.1563 2 6
     11/64 0.1719 2  1/8 6
      3/16 0.1875 2  5/16 6
     13/64 0.2031 2  7/16 6
      7/32 0.2188 2  1/2 6
     15/64 0.2344 2  5/8 6
      1/4 0.2500 2  3/4 6
     17/64 0.2656 2  7/8 6
      9/32 0.2813 2 15/16 6
     19/64 0.2969 3  1/16 6
      5/16 0.3125 3  3/16 6
     21/64 0.3281 3  5/16 6
     11/32 0.3438 3  7/16 6
     23/64 0.3594 3  1/2 6
      3/8 0.3750 3  5/8 6
     25/64 0.3906 3  3/4 6
     13/32 0.4063 3  7/8 6
     27/64 0.4219 3 15/16 6
      7/16 0.4375 4  1/16 6
     29/64 0.4531 4  3/16 6
     15/32 0.4688 4  5/16 6
     31/64 0.4844 4  3/8 6
      1/2 0.5000 4  1/2 6
    1 0.2280 2  5/8 6
    2 0.2210 2  1/2 6
    3 0.2130 2  1/2 6
    4 0.2090 2  1/2 6
    5 0.2055 2  1/2 6
    6 0.2040 2  1/2 6
    7 0.2010 2  7/16 6
    8 0.1990 2  7/16 6
    9 0.1960 2  7/16 6
    10 0.1935 2  7/16 6
    11 0.1910 2  5/16 6
    12 0.1890 2  5/16 6
    13 0.1850 2  5/16 6
    14 0.1820 2  3/16 6
    15 0.1800 2  3/16 6
    16 0.1770 2  3/16 6
    17 0.1730 2  3/16 6
    18 0.1695 2  1/8 6
    19 0.1660 2  1/8 6
    20 0.1610 2  1/8 6
    21 0.1590 2  1/8 6
    22 0.1570 2 6
    23 0.1540 2 6
    24 0.1520 2 6
    25 0.1495 1  7/8 6
    26 0.1470 1  7/8 6
    27 0.1440 1  7/8 6
    28 0.1405 1  3/4 6
    29 0.1360 1  3/4 6
    30 0.1285 1  5/8 6
    31 0.1200 1  5/8 6
    32 0.1160 1  5/8 6
    33 0.1130 1  1/2 6
    34 0.1110 1  1/2 6
    35 0.1100 1  1/2 6
    36 0.1065 1  7/16 6
    37 0.1040 1  7/16 6
    38 0.1015 1  7/16 6
    39 0.0995 1  3/8 6
    40 0.0980 1  3/8 6

    All dimensions are in inches.

    12 INCH EXTENSION BITS

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/16 0.0625   7/8 12
      5/64 0.0781 1 12
      3/32 0.0938 1  1/4 12
      7/64 0.1094 1  1/2 12
      1/8 0.1250 1  5/8 12
      9/64 0.1406 1  3/4 12
      5/32 0.1563 2 12
     11/64 0.1719 2  1/8 12
      3/16 0.1875 2  5/16 12
     13/64 0.2031 2  7/16 12
      7/32 0.2188 2  1/2 12
     15/64 0.2344 2  5/8 12
      1/4 0.2500 2  3/4 12
     17/64 0.2656 2  7/8 12
      9/32 0.2813 2 15/16 12
     19/64 0.2969 3  1/16 12
      5/16 0.3125 3  3/16 12
     21/64 0.3281 3  5/16 12
     11/32 0.3438 3  7/16 12
     23/64 0.3594 3  1/2 12
      3/8 0.3750 3  5/8 12
     25/64 0.3906 3  3/4 12
     13/32 0.4063 3  7/8 12
     27/64 0.4219 3 15/16 12
      7/16 0.4375 4  1/16 12
     29/64 0.4531 4  3/16 12
     15/32 0.4688 4  5/16 12
     31/64 0.4844 4  3/8 12
      1/2 0.5000 4  1/2 12
    1 0.2280 2  5/8 12
    2 0.2210 2  1/2 12
    3 0.2130 2  1/2 12
    4 0.2090 2  1/2 12
    5 0.2055 2  1/2 12
    6 0.2040 2  1/2 12
    7 0.2010 2  7/16 12
    8 0.1990 2  7/16 12
    9 0.1960 2  7/16 12
    10 0.1935 2  7/16 12
    11 0.1910 2  5/16 12
    12 0.1890 2  5/16 12
    13 0.1850 2  5/16 12
    14 0.1820 2  3/16 12
    15 0.1800 2  3/16 12
    16 0.1770 2  3/16 12
    17 0.1730 2  3/16 12
    18 0.1695 2  1/8 12
    19 0.1660 2  1/8 12
    20 0.1610 2  1/8 12
    21 0.1590 2  1/8 12
    22 0.1570 2 12
    23 0.1540 2 12
    24 0.1520 2 12
    25 0.1495 1  7/8 12
    26 0.1470 1  7/8 12
    27 0.1440 1  7/8 12
    28 0.1405 1  3/4 12
    29 0.1360 1  3/4 12
    30 0.1285 1  5/8 12
    31 0.1200 1  5/8 12
    32 0.1160 1  5/8 12
    33 0.1130 1  1/2 12
    34 0.1110 1  1/2 12
    35 0.1100 1  1/2 12
    36 0.1065 1  7/16 12
    37 0.1040 1  7/16 12
    38 0.1015 1  7/16 12
    39 0.0995 1  3/8 12
    40 0.0980 1  3/8 12

     

  • COBALT EXTENSION BITS:

    Cobalt extension bits are recommended for use drilling holes in high tensile strength alloy steels, stainless steels, titanium, and other difficult to machine materials where extended reach is necessary. Manufactured to NAS 907 Type J specifications. 6 or 12 inch length drill bits. Shank diameter equal to drill diameter. Fractional and Number sizes. The 135 degree Split Point eliminates walking at the drill point and reduces thrust.

    Cobalt Extension Drill Bits

    6″ EXTENSION BITS

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/16 0.0625   7/8 6
      5/64 0.0781 1 6
      3/32 0.0938 1  1/4 6
      7/64 0.1094 1  1/2 6
      1/8 0.1250 1  5/8 6
      9/64 0.1406 1  3/4 6
      5/32 0.1563 2 6
     11/64 0.1719 2  1/8 6
      3/16 0.1875 2  5/16 6
     13/64 0.2031 2  7/16 6
      7/32 0.2188 2  1/2 6
     15/64 0.2344 2  5/8 6
      1/4 0.2500 2  3/4 6
      9/32 0.2813 2 15/16 6
      5/16 0.3125 3  3/16 6
      3/8 0.3750 3  5/8 6
    1 0.2280 2  5/8 6
    2 0.2210 2  1/2 6
    3 0.2130 2  1/2 6
    4 0.2090 2  1/2 6
    5 0.2055 2  1/2 6
    6 0.2040 2  1/2 6
    7 0.2010 2  7/16 6
    8 0.1990 2  7/16 6
    9 0.1960 2  7/16 6
    10 0.1935 2  7/16 6
    11 0.1910 2  5/16 6
    12 0.1890 2  5/16 6
    13 0.1850 2  5/16 6
    14 0.1820 2  3/16 6
    15 0.1800 2  3/16 6
    16 0.1770 2  3/16 6
    17 0.1730 2  3/16 6
    18 0.1695 2  1/8 6
    19 0.1660 2  1/8 6
    20 0.1610 2  1/8 6
    21 0.1590 2  1/8 6
    22 0.1570 2 6
    23 0.1540 2 6
    24 0.1520 2 6
    25 0.1495 1  7/8 6
    26 0.1470 1  7/8 6
    27 0.1440 1  7/8 6
    28 0.1405 1  3/4 6
    29 0.1360 1  3/4 6
    30 0.1285 1  5/8 6
    31 0.1200 1  5/8 6
    32 0.1160 1  5/8 6
    33 0.1130 1  1/2 6
    34 0.1110 1  1/2 6
    35 0.1100 1  1/2 6
    36 0.1065 1  7/16 6
    37 0.1040 1  7/16 6
    38 0.1015 1  7/16 6
    39 0.0995 1  3/8 6
    40 0.0980 1  3/8 6

    All dimensions are in inches.

    12″ EXTENSION BITS

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/16 0.0625   7/8 12
      5/64 0.0781 1 12
      3/32 0.0938 1  1/4 12
      7/64 0.1094 1  1/2 12
      1/8 0.1250 1  5/8 12
      9/64 0.1406 1  3/4 12
      5/32 0.1563 2 12
     11/64 0.1719 2  1/8 12
      3/16 0.1875 2  5/16 12
     13/64 0.2031 2  7/16 12
      7/32 0.2188 2  1/2 12
     15/64 0.2344 2  5/8 12
      1/4 0.2500 2  3/4 12
     17/64 0.2656 2  7/8 12
      9/32 0.2813 2 15/16 12
     19/64 0.2969 3  1/16 12
      5/16 0.3125 3  3/16 12
     21/64 0.3281 3  5/16 12
     11/32 0.3438 3  7/16 12
     23/64 0.3594 3  1/2 12
      3/8 0.3750 3  5/8 12
     25/64 0.3906 3  3/4 12
     13/32 0.4063 3  7/8 12
     27/64 0.4219 3 15/16 12
      7/16 0.4375 4  1/16 12
     29/64 0.4531 4  3/16 12
     15/32 0.4688 4  5/16 12
     31/64 0.4844 4  3/8 12
      1/2 0.5000 4  1/2 12
    1 0.2280 2  5/8 12
    2 0.2210 2  1/2 12
    3 0.2130 2  1/2 12
    4 0.2090 2  1/2 12
    5 0.2055 2  1/2 12
    6 0.2040 2  1/2 12
    7 0.2010 2  7/16 12
    8 0.1990 2  7/16 12
    9 0.1960 2  7/16 12
    10 0.1935 2  7/16 12
    11 0.1910 2  5/16 12
    12 0.1890 2  5/16 12
    13 0.1850 2  5/16 12
    14 0.1820 2  3/16 12
    15 0.1800 2  3/16 12
    16 0.1770 2  3/16 12
    17 0.1730 2  3/16 12
    18 0.1695 2  1/8 12
    19 0.1660 2  1/8 12
    20 0.1610 2  1/8 12
    21 0.1590 2  1/8 12
    22 0.1570 2 12
    23 0.1540 2 12
    24 0.1520 2 12
    25 0.1495 1  7/8 12
    26 0.1470 1  7/8 12
    27 0.1440 1  7/8 12
    28 0.1405 1  3/4 12
    29 0.1360 1  3/4 12
    30 0.1285 1  5/8 12
    31 0.1200 1  5/8 12
    32 0.1160 1  5/8 12
    33 0.1130 1  1/2 12
    34 0.1110 1  1/2 12
    35 0.1100 1  1/2 12
    36 0.1065 1  7/16 12
    37 0.1040 1  7/16 12
    38 0.1015 1  7/16 12
    39 0.0995 1  3/8 12

    All dimensions are in inches.

  • HIGH SPEED STEEL EXTRA LENGTH BITS:

    High speed steel extra length drill bits for use in general drilling applications where extended reach or extended drilling depth is necessary. Extended flute lengths allow drilling to extreme hole depths. General purpose flute design which performs satisfactory under the widest range of operating conditions and materials. 8, 12, and 18 inch length drill bits. For 1/8 though 1/2″ diameters, shank diameter is equal to drill diameter. Diameters larger than 1/2″ available in full-diameter straight shank or 1/2″ reduced shank. 118 degree point.

    Extra Length Drill Bits

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/8 0.1250 6 8
      9/16 0.5625 6 8
      5/32 0.1563 6 8
     11/64 0.1719 6 8
      3/16 0.1875 6 8
     13/64 0.2031 6 8
      7/32 0.2188 6 8
     15/64 0.2344 6 8
      1/4 0.2500 6 8
     17/64 0.2656 6 8
      9/32 0.2813 6 8
     19/64 0.2969 6 8
      5/16 0.3125 6 8
     21/64 0.3281 6 8
     11/32 0.3438 6 8
     23/64 0.3594 6 8
      3/8 0.3750 6 8
     25/64 0.3906 6 8
     13/32 0.4063 6 8
     27/64 0.4219 6 8
      7/16 0.4375 6 8
     29/64 0.4531 6 8
     15/32 0.4688 6 8
     31/64 0.4844 6 8
      1/2 0.5000 6 8
      1/8 0.1250 9 12
      9/64 0.1406 9 12
      5/32 0.1563 9 12
     11/64 0.1719 9 12
      3/16 0.1875 9 12
     13/64 0.2031 9 12
      7/32 0.2188 9 12
     15/64 0.2344 9 12
      1/4 0.2500 9 12
     17/64 0.2656 9 12
      9/32 0.2813 9 12
     19/64 0.2969 9 12
      5/16 0.3125 9 12
     21/64 0.3281 9 12
     11/32 0.3438 9 12
     23/64 0.3594 9 12
      3/8 0.3750 9 12
     25/64 0.3906 9 12
     13/32 0.4063 9 12
     27/64 0.4219 9 12
      7/16 0.4375 9 12
     29/64 0.4531 9 12
     15/32 0.4688 9 12
     31/64 0.4844 9 12
      1/2 0.5000 9 12
     33/64 0.5156 9 12
     17/32 0.5313 9 12
     35/64 0.5469 9 12
      9/16 0.5625 9 12
     37/64 0.5781 9 12
     19/32 0.5938 9 12
     39/64 0.6094 9 12
      5/8 0.6250 9 12
     41/64 0.6406 9 12
     21/32 0.6563 9 12
     43/64 0.6719 9 12
     11/16 0.6875 9 12
     45/64 0.7031 9 12
     23/32 0.7188 9 12
     47/64 0.7344 9 12
      3/4 0.7500 9 12
      1/4 0.2500 13 18
     17/64 0.2656 13 18
      9/32 0.2813 13 18
     19/64 0.2969 13 18
      5/16 0.3125 13 18
     21/64 0.3281 13 18
     11/32 0.3438 13 18
     23/64 0.3594 13 18
      3/8 0.3750 13 18
     25/64 0.3906 13 18
     13/32 0.4063 13 18
     27/64 0.4219 13 18
      7/16 0.4375 13 18
     29/64 0.4531 13 18
     15/32 0.4688 13 18
     31/64 0.4844 13 18
      1/2 0.5000 13 18
     33/64 0.5156 13 18
     17/32 0.5313 13 18
     35/64 0.5469 13 18
      9/16 0.5625 13 18
     37/64 0.5781 13 18
     19/32 0.5938 13 18
     39/64 0.6094 13 18
      5/8 0.6250 13 18
     21/32 0.6563 13 18
     11/16 0.6875 13 18
     23/32 0.7188 13 18
      3/4 0.7500 13 18
     25/32 0.7813 13 18
     13/16 0.8125 13 18
     27/32 0.8438 13 18
      7/8 0.8750 13 18
     29/32 0.9063 13 18
     15/16 0.9375 13 18
     31/32 0.9688 13 18
    1 1.0000 13 18

    All dimensions are in inches.

    • DRILL SELECTION

      DRILL BIT SELECTION GUIDE:

      Use this chart to help you find the best drill bit for the job. Simply choose your material and then the corresponding tool that best fits your application.

      Drill Bit Selection Guide

    • FEEDS AND SPEEDS

      RECOMMENDED FEED RATES AND SPEED:

      Drill Bit Recommended Feed Rates and Speeds

      Feeds – Feed rates for drilling are governed by the drill diameter, machinability of materials and depth of hole. Speeds – The speed of a drill is determined by the rate which the outer periphery of the tool rotates in relation to material being cut. In general, the SFM at which a drill will operate is within a range based upon the workpiece material, its condition, hardness and depth of hole. It is usually advisable to start the drilling process at a slower SFM and then increase to the maximum.
      RPM = SFM/TD x 3.82 = Revolutions Per Minute
      SFM = RPM x TD x .26 = Surface Feet Per Minute
      TD = Tool diameter in inches

      Drill Bit Feed Rates Technical Data

    • TROUBLESHOOTING

      DRILL TROUBLESHOOTING GUIDE:

      The guide below can help identify the causes of some common issues that can be experienced while drilling.

      Drill Bit Troubleshooting Guide

Sources: Drillco Cutting Tools Product Catalog 2013, Champion Cutting Tools 2011 Product Catalog, Norseman/CTD Product Catalog 2013

Note: All material included on this page is informational only, and should not be used as one’s sole source for design purposes. STS Industrial, Inc. and its affiliates do not guarantee the accuracy of the information on this site, and retain no liability for the use or misuse of the information contained on this site.