STS Industrial - Bolts & Screws

 

NITRO HIGH SPEED STEEL DRILL BITS

The Nitro Heavy Duty 135 degree Split Point drill bit is treated with a Nitride surface treatment that lends a hard, protective layer to the drill bit without increasing brittleness, and also retards the tendency of softer materials to cling or load on tools. The treated surface is measurably harder than high speed steel. Body and clearance are black and gold surface treated for maximum lubricity. The 135 degree Split Point (except 1/2″ shank Nitro) eliminates walking at the drill point, reduces thrust, and eliminates the need to pre-drill. Recommended for general use, as well as drilling stainless steel and other hard-to-drill materials.

FEATURES:
  • Made in the USA
  • Nitro’s Nitride surface treatment increases tool life, hardness, and lubricity
  • Split point design
APPLICATIONS:
  • General drilling applications
  • Steel
  • Stainless steel
  • Non-metallic materials
  • Drills what standard high speed steel drill bits cannot

Nitro Drill Bits

  • FRACTIONAL JOBBER LENGTH NITRO BITS:

    Standard length fractional series drill bits. Shank diameter equal to drill diameter.

    Nitro Jobber Length Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/16 0.0625   7/8 1  7/8
      5/64 0.0781 1 2
      3/32 0.0938 1  1/4 2  1/4
      7/64 0.1094 1  1/2 2  5/8
      1/8 0.1250 1  5/8 2  3/4
      9/64 0.1406 1  3/4 2  7/8
      5/32 0.1563 2 3  1/8
     11/64 0.1719 2  1/8 3  1/4
      3/16 0.1875 2  5/16 3  1/2
     13/64 0.2031 2  7/16 3  5/8
      7/32 0.2188 2  1/2 3  3/4
     15/64 0.2344 2  5/8 3  7/8
      1/4 0.2500 2  3/4 4
     17/64 0.2656 2  7/8 4  1/8
      9/32 0.2813 2 15/16 4  1/4
     19/64 0.2969 3  1/16 4  3/8
      5/16 0.3125 3  3/16 4  1/2
     21/64 0.3281 3  5/16 4  5/8
     11/32 0.3438 3  7/16 4  3/4
     23/64 0.3594 3  1/2 4  7/8
      3/8 0.3750 3  5/8 5
     25/64 0.3906 3  3/4 5  1/8
     13/32 0.4063 3  7/8 5  1/4
     27/64 0.4219 3 15/16 5  3/8
      7/16 0.4375 4  1/16 5  1/2
     29/64 0.4531 4  3/16 5  5/8
     15/32 0.4688 4  5/16 5  3/4
     31/64 0.4844 4  3/8 5  7/8
      1/2 0.5000 4  1/2 6

  • LETTER SERIES NITRO BITS:

    Standard length drill bits. Letter series sizing. Shank diameter equal to drill diameter.

    Nitro Jobber Length Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

    A 0.2340 2  5/8 3  7/8
    B 0.2380 2  3/4 4
    C 0.2420 2  3/4 4
    D 0.2460 2  3/4 4
    E 0.2500 2  3/4 4
    F 0.2570 2  7/8 4  1/8
    G 0.2610 2  7/8 4  1/8
    H 0.2660 2  7/8 4  1/8
    I 0.2720 2  7/8 4  1/8
    J 0.2770 2  7/8 4  1/8
    K 0.2810 2 15/16 4  1/4
    L 0.2900 2 15/16 4  1/4
    M 0.2950 3  1/16 4  3/8
    N 0.3020 3  1/16 4  3/8
    O 0.3160 3  3/16 4  1/2
    P 0.3230 3  5/16 4  5/8
    Q 0.3320 3  7/16 4  3/4
    R 0.3390 3  7/16 4  3/4
    S 0.3480 3  1/2 4  7/8
    T 0.3580 3  1/2 4  7/8
    U 0.3680 3  5/8 5
    V 0.3770 3  5/8 5
    W 0.3860 3  3/4 5  1/8
    X 0.3970 3  3/4 5  1/8
    Y 0.4040 3  7/8 5  1/4
    Z 0.4130 3  7/8 5  1/4

    All dimensions are in inches.

  • NUMBER SERIES NITRO BITS:

    Standard length drill bits. Number series sizing. Shank diameter equal to drill diameter.

    Nitro Jobber Length Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

    1 0.2280 2  5/8 3  7/8
    2 0.2210 2  1/2 3  7/8
    3 0.2130 2  1/2 3  3/4
    4 0.2090 2  1/2 3  3/4
    5 0.2055 2  1/2 3  3/4
    6 0.2040 2  1/2 3  3/4
    7 0.2010 2  7/16 3  5/8
    8 0.1990 2  7/16 3  5/8
    9 0.1960 2  7/16 3  5/8
    10 0.1935 2  7/16 3  5/8
    11 0.1910 2  5/16 3  1/2
    12 0.1890 2  5/16 3  1/2
    13 0.1850 2  5/16 3  1/2
    14 0.1820 2  3/16 3  3/8
    15 0.1800 2  3/16 3  3/8
    16 0.1770 2  3/16 3  3/8
    17 0.1730 2  3/16 3  3/8
    18 0.1695 2  1/8 3  1/4
    19 0.1660 2  1/8 3  1/4
    20 0.1610 2  1/8 3  1/4
    21 0.1590 2  1/8 3  1/4
    22 0.1570 2 3  1/8
    23 0.1540 2 3  1/8
    24 0.1520 2 3  1/8
    25 0.1495 1  7/8 3
    26 0.1470 1  7/8 3
    27 0.1440 1  7/8 3
    28 0.1405 1  3/4 2  7/8
    29 0.1360 1  3/4 2  7/8
    30 0.1285 1  5/8 2  3/4
    31 0.1200 1  5/8 2  3/4
    32 0.1160 1  5/8 2  3/4
    33 0.1130 1  1/2 2  5/8
    34 0.1110 1  1/2 2  5/8
    35 0.1100 1  1/2 2  5/8
    36 0.1065 1  7/16 2  1/2
    37 0.1040 1  7/16 2  1/2
    38 0.1015 1  7/16 2  1/2
    39 0.0995 1  3/8 2  3/8
    40 0.0980 1  3/8 2  3/8
    41 0.0960 1  3/8 2  3/8
    42 0.0935 1  1/4 2  1/4
    43 0.0890 1  1/4 2  1/4
    44 0.0860 1  1/8 2  1/8
    45 0.0820 1  1/8 2  1/8
    46 0.0810 1  1/8 2  1/8
    47 0.0785 1 2
    48 0.0760 1 2
    49 0.0730 1 2
    50 0.0700 1 2
    51 0.0670 1 2
    52 0.0635   7/8 1  7/8
    53* 0.0595   7/8 1  7/8
    54* 0.0550   7/8 1  7/8
    55* 0.0520   7/8 1  7/8
    56* 0.0465   3/4 1  3/4
    57* 0.0430   3/4 1  3/4
    58* 0.0420  11/16 1  5/8
    59* 0.0410  11/16 1  5/8
    60* 0.0400  11/16 1  5/8

    *Not split point design. All dimensions are in inches.

  • STUBBY LENGTH NITRO BITS:

    Stubby, or Screw Machine length drill bits have a shorter length for more accurate drilling in lathes and presses. Shank diameter equal to drill diameter.

    Nitro Stubby Length Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/16 0.0625   5/8 1  5/8
      5/64 0.0781  11/16 1 11/16
      3/32 0.0938   3/4 1  3/4
      7/64 0.1094  13/16 1 13/16
      1/8 0.1250   7/8 1  7/8
      9/64 0.1406  15/16 1 15/16
      5/32 0.1563 1 2  1/16
     11/64 0.1719 1  1/16 2  1/8
      3/16 0.1875 1  1/8 2  3/16
     13/64 0.2031 1  3/16 2  1/4
      7/32 0.2188 1  1/4 2  3/8
     15/64 0.2344 1  5/16 2  7/16
      1/4 0.2500 1  3/8 2  1/2
     17/64 0.2656 1  7/16 2  5/8
      9/32 0.2813 1  1/2 2 11/16
     19/64 0.2969 1  9/16 2  3/4
      5/16 0.3125 1  5/8 2 13/16
     21/64 0.3281 1 11/16 2 15/16
     11/32 0.3438 1 11/16 3
     23/64 0.3594 1  3/4 3  1/16
      3/8 0.3750 1 13/16 3  1/8
     25/64 0.3906 1  7/8 3  1/4
     13/32 0.4063 1 15/16 3  5/16
     27/64 0.4219 2 3  3/8
      7/16 0.4375 2  1/16 3  7/16
     29/64 0.4531 2  1/8 3  9/16
     15/32 0.4688 2  1/8 3  5/8
     31/64 0.4844 2  3/16 3 11/16
      1/2 0.5000 2  1/4 3  3/4

    All dimensions are in inches.

  • MECHANIC LENGTH NITRO BITS:

    Mechanic length drill bits are shorter than jobber length bits. Shank diameter equal to drill diameter, and bits 3/16″ and larger have 3 flats.

    Nitro Mechanics Length Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

      1/16 0.0625   7/8 1  7/8
      5/64 0.0781 1 2
      3/32 0.0938 1  1/4 2  1/4
      7/64 0.1094 1  5/16 2  3/8
      1/8 0.1250 1  7/16 2  1/2
      9/64 0.1406 1  9/16 2  5/8
      5/32 0.1563 1 11/16 2  3/4
     11/64 0.1719 1 13/16 2  7/8
      3/16 0.1875 1  7/8 3
     13/64 0.2031 1 15/16 3  1/8
      7/32 0.2188 2 3  1/4
     15/64 0.2344 2  1/16 3  3/8
      1/4 0.2500 2  3/32 3  1/2
     17/64 0.2656 2  1/8 3  5/8
      9/32 0.2813 2  1/4 3  3/4
     19/64 0.2969 2  3/8 3  7/8
      5/16 0.3125 2  1/2 4
     21/64 0.3281 2  9/16 4  1/16
     11/32 0.3438 2  5/8 4  1/8
     23/64 0.3594 2 11/16 4  3/16
      3/8 0.3750 2 11/16 4  1/4
     25/64 0.3906 2  3/4 4  5/16
     13/32 0.4063 2 13/16 4  3/8
     27/64 0.4219 2  7/8 4  7/16
      7/16 0.4375 2 15/16 4  1/2
     29/64 0.4531 3 4  5/8
     15/32 0.4688 3  1/8 4  3/4
     31/64 0.4844 3  1/4 4  7/8
      1/2 0.5000 3  3/8 5

    All dimensions are in inches.

  • 1/2″ REDUCED SHANK NITRO S&D BITS:

    118 degree split point design. Standard length S&D drill bits. 1/2″ diameter shank with 3 flats for secure mounting in drill chuck.

    Nitro S&D Reduced Shank Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

     33/64 0.5156 3 6
     17/32 0.5313 3 6
     35/64 0.5469 3 6
      9/16 0.5625 3 6
     37/64 0.5781 3 6
     19/32 0.5938 3 6
     39/64 0.6094 3 6
      5/8 0.6250 3 6
     41/64 0.6406 3 6
     21/32 0.6563 3 6
     43/64 0.6719 3 6
     11/16 0.6875 3 6
     45/64 0.7031 3 6
     23/32 0.7188 3 6
     47/64 0.7344 3 6
      3/4 0.7500 3 6
     49/64 0.7656 3 6
     25/32 0.7813 3 6
     51/64 0.7969 3 6
     13/16 0.8125 3 6
     53/64 0.8281 3 6
     27/32 0.8438 3 6
     55/64 0.8594 3 6
      7/8 0.8750 3 6
     57/64 0.8906 3 6
     29/32 0.9063 3 6
     59/64 0.9219 3 6
     15/16 0.9375 3 6
     61/64 0.9531 3 6
     31/32 0.9688 3 6
     63/64 0.9844 3 6
    1 1.0000 3 6
    1  1/64** 1.0156 3 6
    1  1/32* 1.0313 3 6
    1  3/64** 1.0469 3 6
    1  1/16* 1.0625 3 6
    1  5/64** 1.0781 3 6
    1  3/32* 1.0938 3 6
    1  7/64** 1.1094 3 6
    1  1/8* 1.1250 3 6
    1  9/64** 1.1406 3 6
    1  5/32* 1.1563 3 6
    1 11/64** 1.1719 3 6
    1  3/16* 1.1875 3 6
    1 13/64** 1.2031 3 6
    1  7/32* 1.2188 3 6
    1 15/64** 1.2344 3 6
    1  1/4* 1.2500 3 6
    1 17/64** 1.2656 3 6
    1  9/32* 1.2813 3 6
    1 19/64** 1.2969 3 6
    1  5/16* 1.3125 3 6
    1 21/64** 1.3281 3 6
    1 11/32* 1.3438 3 6
    1 23/64** 1.3594 3 6
    1  3/8* 1.3750 3 6
    1 25/64** 1.3906 3 6
    1 13/32* 1.4063 3 6
    1 27/64** 1.4219 3 6
    1  7/16* 1.4375 3 6
    1 29/64** 1.4531 3 6
    1 15/32* 1.4688 3 6
    1 31/64** 1.4844 3 6
    1  1/2* 1.5000 3 6

     

    • All dimensions are in inches.
    • *Not Nitro: Black & Gold high quality European import. 135 degree split point design.
    • **Not Nitro: Silver & Black high quality European import. 118 degree point design.

     

    All dimensions are in inches.

  • 3/8″ REDUCED SHANK NITRO BITS:

    Standard length drill bits. 3/8″ diameter shank.

    Nitro 38 Reduced Shank Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

     25/64 0.3906 3  3/4 5  1/8
     13/32 0.4063 3  7/8 5  1/4
     27/64 0.4219 3 15/16 5  3/8
      7/16 0.4375 4  1/16 5  1/2
     29/64 0.4531 4  3/16 5  5/8
     15/32 0.4688 4  5/16 5  3/4
     31/64 0.4844 4  3/8 5  7/8
      1/2 0.5000 4  1/2 6
     17/32 0.5313 4  1/2 6
      9/16 0.5625 4  1/2 6
      5/8 0.6250 4  1/2 6
     11/16 0.6875 4  1/2 6
      3/4 0.7500 4  1/2 6

    All dimensions are in inches.

    3/8″ REDUCED SHANK MECHANIC LENGTH NITRO BITS:

    Mechanic length drill bits are shorter than standard drill bits. 3/8″ diameter shank with 3 flats for secure mounting in drill chuck.

    Nitro Mechanics Reduced Shank Drill Bit

    SIZE

    DECIMAL EQUIVALENT

    FLUTE LENGTH

    OVERALL LENGTH

     25/64 0.3906 2  3/4 4  5/16
     13/32 0.4063 2 13/16 4  3/8
     27/64 0.4219 2  7/8 4  7/16
      7/16 0.4375 2 15/16 4  1/2
     29/64 0.4531 3 4  5/8
     15/32 0.4688 3  1/8 4  3/4
     31/64 0.4844 3  1/4 4  7/8
      1/2 0.5000 3  3/8 5

    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.