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    163 Products
    About Drill Bits
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    Compare material, finish, length class, and decimal size equivalents.

    Cobalt Steel Drill Bits

    Image of Product. Front orientation. Drill Bits. Cobalt Steel Drill Bits, Extended Length, Round Shank.
    Image of Specification. Split. Front orientation. Contains Border. Split Point. For Metal.

    Extended Length

    Round Shank

    Split

    Tough and wear resistant, cobalt steel bits last at least twice as long as high-speed steel. They can also run up to 25% faster at higher temperatures without being damaged on hard materials, such as nickel.
    Extended Length—Drill through panels and thick workpieces with our longest bits. Their length is good for creating deep holes but makes them less rigid than other bits. As a result, they are more prone to wobbling or breaking, especially when drilling hard materials.
    Uncoated—Polished to eject chips, these are also known as bright finish bits.
    Shank
    Drill Bit
    Size
    Decimal Size
    Equiv.
    Overall
    Lg.
    Max. Drilling
    Dp.
    Type
    Size
    Drill Bit
    Point Type
    Each
    Extended Length
     
    Uncoated
    1/16"
    0.0625"
    3"1.62"Round
    1/16"Split
    0000000000000
    5/64"
    0.0781"
    3 3/4"1.84"Round
    5/64"Split
    0000000000000
    3/32"
    0.0938"
    4 1/4"2.06"Round
    3/32"Split
    0000000000000
    3/32"
    0.0938"
    8"5.5"Round
    3/32"Split
    000000000000
    7/64"
    0.1094"
    4 5/8"2.28"Round
    7/64"Split
    0000000000000
    1/8"
    0.125"
    5 1/8"2.5"Round
    1/8"Split
    0000000000000
    1/8"
    0.125"
    8"5.5"Round
    1/8"Split
    000000000000
    1/8"
    0.125"
    12"9"Round
    1/8"Split
    000000000000
    9/64"
    0.1406"
    5 3/8"2.71"Round
    9/64"Split
    0000000000000
    5/32"
    0.1563"
    5 3/8"2.68"Round
    5/32"Split
    0000000000000
    5/32"
    0.1563"
    8"5.5"Round
    5/32"Split
    000000000000
    11/64"
    0.1719"
    5 3/4"3.03"Round
    11/64"Split
    0000000000000
    3/16"
    0.1875"
    5 3/4"3"Round
    3/16"Split
    0000000000000
    3/16"
    0.1875"
    8"5.5"Round
    3/16"Split
    000000000000
    3/16"
    0.1875"
    12"9"Round
    3/16"Split
    000000000000
    13/64"
    0.2031"
    6"3.21"Round
    13/64"Split
    0000000000000
    7/32"
    0.2188"
    6"3.18"Round
    7/32"Split
    0000000000000
    15/64"
    0.2344"
    6 1/8"3.28"Round
    15/64"Split
    0000000000000
    1/4"
    0.25"
    6 1/8"3.25"Round
    1/4"Split
    0000000000000
    1/4"
    0.25"
    8"5.5"Round
    1/4"Split
    000000000000
    1/4"
    0.25"
    12"9"Round
    1/4"Split
    000000000000
    17/64"
    0.2656"
    6 1/4"3.34"Round
    17/64"Split
    0000000000000
    17/64"
    0.2656"
    8"5.5"Round
    17/64"Split
    000000000000
    9/32"
    0.2813"
    6 1/4"3.31"Round
    9/32"Split
    0000000000000
    9/32"
    0.2813"
    8"5.5"Round
    9/32"Split
    000000000000
    5/16"
    0.3125"
    6 3/8"3.37"Round
    5/16"Split
    0000000000000
    5/16"
    0.3125"
    8"5.5"Round
    5/16"Split
    000000000000
    5/16"
    0.3125"
    12"9"Round
    5/16"Split
    000000000000
    21/64"
    0.3281"
    6 1/2"3.46"Round
    21/64"Split
    0000000000000
    11/32"
    0.3438"
    6 1/2"3.43"Round
    11/32"Split
    0000000000000
    3/8"
    0.375"
    6 3/4"3.5"Round
    3/8"Split
    0000000000000
    3/8"
    0.375"
    8"5.5"Round
    3/8"Split
    000000000000
    3/8"
    0.375"
    12"9"Round
    3/8"Split
    000000000000
    25/64"
    0.3906"
    7"3.59"Round
    25/64"Split
    0000000000000
    7/16"
    0.4375"
    7 1/4"3.75"Round
    7/16"Split
    0000000000000
    7/16"
    0.4375"
    8"5.5"Round
    7/16"Split
    000000000000
    7/16"
    0.4375"
    12"9"Round
    7/16"Split
    000000000000
    1/2"
    0.5"
    7 3/4"3.75"Round
    1/2"Split
    0000000000000
    1/2"
    0.5"
    12"9"Round
    1/2"Split
    000000000000
    17/32"
    0.5313"
    8"3.68"Round
    17/32"Split
    0000000000000
    9/16"
    0.5625"
    8 1/4"3.75"Round
    9/16"Split
    0000000000000
    9/16"
    0.5625"
    12"9"Round
    9/16"Split
    0000000000000
    5/8"
    0.625"
    8 3/4"3.62"Round
    5/8"Split
    0000000000000
    5/8"
    0.625"
    12"9"Round
    5/8"Split
    0000000000000
    21/32"
    0.6563"
    9"3.81"Round
    21/32"Split
    00000000000000
    11/16"
    0.6875"
    9 1/4"4"Round
    11/16"Split
    00000000000000
    11/16"
    0.6875"
    12"9"Round
    11/16"Split
    0000000000000
    3/4"
    0.75"
    9 3/4"4.37"Round
    3/4"Split
    00000000000000
    1"
    1"
    11"4.37"Round
    1"Split
    00000000000000
    40
    0.098"
    4 5/8"2.3"Round
    0.098"Split
    0000000000000
    39
    0.0995"
    4 5/8"2.3"Round
    0.0995"Split
    0000000000000
    36
    0.1065"
    4 5/8"2.3"Round
    0.1065"Split
    0000000000000
    35
    0.11"
    5 1/8"2.5"Round
    0.11"Split
    0000000000000
    34
    0.111"
    5 1/8"2.5"Round
    0.111"Split
    0000000000000
    33
    0.113"
    5 1/8"2.5"Round
    0.113"Split
    0000000000000
    32
    0.116"
    5 1/8"2.5"Round
    0.116"Split
    0000000000000
    31
    0.12"
    5 1/8"2.5"Round
    0.12"Split
    0000000000000
    30
    0.1285"
    5 3/8"2.7"Round
    0.1285"Split
    0000000000000
    29
    0.136"
    5 3/8"2.7"Round
    0.136"Split
    0000000000000
    28
    0.1405"
    5 3/8"2.7"Round
    0.1405"Split
    0000000000000
    27
    0.144"
    5 3/8"2.7"Round
    0.144"Split
    0000000000000
    26
    0.147"
    5 3/8"2.7"Round
    0.147"Split
    0000000000000
    25
    0.1495"
    5 3/8"2.7"Round
    0.1495"Split
    0000000000000
    24
    0.152"
    5 3/8"2.7"Round
    0.152"Split
    0000000000000
    22
    0.157"
    5 3/4"3.1"Round
    0.157"Split
    0000000000000
    21
    0.159"
    5 3/4"3.1"Round
    0.159"Split
    0000000000000
    20
    0.161"
    5 3/4"3"Round
    0.161"Split
    0000000000000
    19
    0.166"
    5 3/4"3"Round
    0.166"Split
    0000000000000
    18
    0.1695"
    5 3/4"3"Round
    0.1695"Split
    0000000000000
    17
    0.173"
    5 3/4"3"Round
    0.173"Split
    0000000000000
    16
    0.177"
    5 3/4"3"Round
    0.177"Split
    0000000000000
    15
    0.18"
    5 3/4"3"Round
    0.18"Split
    0000000000000
    14
    0.182"
    5 3/4"3"Round
    0.182"Split
    0000000000000
    13
    0.185"
    5 3/4"3"Round
    0.185"Split
    0000000000000
    12
    0.189"
    6"3.2"Round
    0.189"Split
    0000000000000
    11
    0.191"
    6"3.2"Round
    0.191"Split
    0000000000000
    10
    0.1935"
    6"3.2"Round
    0.1935"Split
    0000000000000
    9
    0.196"
    6"3.23"Round
    0.196"Split
    0000000000000
    8
    0.199"
    6"3.22"Round
    0.199"Split
    0000000000000
    7
    0.201"
    6"3.22"Round
    0.201"Split
    0000000000000
    5
    0.2055"
    6"3.21"Round
    0.2055"Split
    0000000000000
    4
    0.209"
    6"3.2"Round
    0.209"Split
    0000000000000
    3
    0.213"
    6"3.19"Round
    0.213"Split
    0000000000000
    2
    0.221"
    6 1/8"3.3"Round
    0.221"Split
    0000000000000
    1
    0.228"
    6 1/8"3.3"Round
    0.228"Split
    0000000000000
     

    Short-Flute Cobalt Steel Drill Bits

    Image of Product. Front orientation. Drill Bits. Short-Flute Cobalt Steel Drill Bits, Extended Length, Round Shank.
    Image of Specification. Split. Front orientation. Contains Border. Split Point. For Metal.

    Extended Length

    Round Shank

    Split

    These bits combine the toughness and wear resistance of cobalt with short flutes for rigidity. The shallow drilling depth makes them less likely to wobble than other bits of the same length, so they stay centered and drill straighter. Cobalt lasts at least twice as long as high-speed steel. It can also run up to 25% faster at higher temperatures without damaging the bit on hard materials such as nickel.
    Extended Length—Drill through panels and thick workpieces with our longest bits.
    Uncoated—Polished to eject chips, these are also known as bright finish bits.
    Shank
    Drill Bit
    Size
    Decimal Size
    Equiv.
    Overall
    Lg.
    Max. Drilling
    Dp.
    Type
    Size
    Drill Bit
    Point Type
    Each
    Extended Length
     
    Uncoated
    1/16"
    0.0625"
    6"0.75"Round
    1/16"Split
    000000000000
    1/16"
    0.0625"
    12"0.75"Round
    1/16"Split
    000000000000
    5/64"
    0.0781"
    6"0.84"Round
    5/64"Split
    00000000000
    5/64"
    0.0781"
    12"0.84"Round
    5/64"Split
    000000000000
    3/32"
    0.0938"
    6"1.06"Round
    3/32"Split
    00000000000
    3/32"
    0.0938"
    12"1.06"Round
    3/32"Split
    000000000000
    7/64"
    0.1094"
    6"1.28"Round
    7/64"Split
    00000000000
    7/64"
    0.1094"
    12"1.28"Round
    7/64"Split
    000000000000
    1/8"
    0.125"
    6"1.37"Round
    1/8"Split
    00000000000
    1/8"
    0.125"
    12"1.37"Round
    1/8"Split
    000000000000
    9/64"
    0.1406"
    6"1.46"Round
    9/64"Split
    00000000000
    9/64"
    0.1406"
    12"1.46"Round
    9/64"Split
    000000000000
    5/32"
    0.1563"
    6"1.68"Round
    5/32"Split
    00000000000
    5/32"
    0.1563"
    12"1.68"Round
    5/32"Split
    000000000000
    11/64"
    0.1719"
    6"1.78"Round
    11/64"Split
    00000000000
    11/64"
    0.1719"
    12"1.78"Round
    11/64"Split
    000000000000
    3/16"
    0.1875"
    6"1.93"Round
    3/16"Split
    00000000000
    3/16"
    0.1875"
    12"1.93"Round
    3/16"Split
    000000000000
    13/64"
    0.2031"
    6"2.03"Round
    13/64"Split
    000000000000
    13/64"
    0.2031"
    12"2.03"Round
    13/64"Split
    000000000000
    7/32"
    0.2188"
    6"2.06"Round
    7/32"Split
    000000000000
    7/32"
    0.2188"
    12"2.06"Round
    7/32"Split
    000000000000
    15/64"
    0.2344"
    6"2.15"Round
    15/64"Split
    000000000000
    15/64"
    0.2344"
    12"2.15"Round
    15/64"Split
    000000000000
    1/4"
    0.25"
    6"2.25"Round
    1/4"Split
    000000000000
    1/4"
    0.25"
    12"2.25"Round
    1/4"Split
    000000000000
    52
    0.0635"
    6"0.87"Round
    0.0635"Split
    000000000000
    51
    0.067"
    6"0.86"Round
    0.067"Split
    000000000000
    50
    0.07"
    6"0.86"Round
    0.07"Split
    000000000000
    49
    0.073"
    6"0.85"Round
    0.073"Split
    000000000000
    48
    0.076"
    6"0.84"Round
    0.076"Split
    000000000000
    47
    0.0785"
    6"0.84"Round
    0.0785"Split
    000000000000
    46
    0.081"
    6"0.96"Round
    0.081"Split
    000000000000
    45
    0.082"
    6"0.96"Round
    0.082"Split
    000000000000
    44
    0.086"
    6"0.95"Round
    0.086"Split
    000000000000
    43
    0.089"
    6"1.07"Round
    0.089"Split
    000000000000
    42
    0.0935"
    6"1.06"Round
    0.0935"Split
    000000000000
    41
    0.096"
    6"1.18"Round
    0.096"Split
    000000000000
    40
    0.098"
    6"1.17"Round
    0.098"Split
    00000000000
    39
    0.0995"
    6"1.17"Round
    0.0995"Split
    000000000000
    38
    0.1015"
    6"1.23"Round
    0.1015"Split
    000000000000
    37
    0.104"
    6"1.22"Round
    0.104"Split
    000000000000
    36
    0.1065"
    6"1.22"Round
    0.1065"Split
    000000000000
    35
    0.11"
    6"1.28"Round
    0.11"Split
    000000000000
    34
    0.111"
    6"1.27"Round
    0.111"Split
    000000000000
    33
    0.113"
    6"1.27"Round
    0.113"Split
    000000000000
    32
    0.116"
    6"1.39"Round
    0.116"Split
    000000000000
    31
    0.12"
    6"1.38"Round
    0.12"Split
    000000000000
    30
    0.1285"
    6"1.36"Round
    0.1285"Split
    000000000000
    29
    0.136"
    6"1.47"Round
    0.136"Split
    000000000000
    28
    0.1405"
    6"1.46"Round
    0.1405"Split
    000000000000
    27
    0.144"
    6"1.58"Round
    0.144"Split
    000000000000
    26
    0.147"
    6"1.58"Round
    0.147"Split
    000000000000
    25
    0.1495"
    6"1.7"Round
    0.1495"Split
    000000000000
    24
    0.152"
    6"1.69"Round
    0.152"Split
    000000000000
    23
    0.154"
    6"1.69"Round
    0.154"Split
    000000000000
    22
    0.157"
    6"1.68"Round
    0.157"Split
    000000000000
    21
    0.159"
    6"1.8"Round
    0.159"Split
    000000000000
    20
    0.161"
    6"1.8"Round
    0.161"Split
    000000000000
    19
    0.166"
    6"1.79"Round
    0.166"Split
    000000000000
    18
    0.1695"
    6"1.78"Round
    0.1695"Split
    000000000000
    17
    0.173"
    6"1.84"Round
    0.173"Split
    000000000000
    16
    0.177"
    6"1.83"Round
    0.177"Split
    000000000000
    15
    0.18"
    6"1.82"Round
    0.18"Split
    000000000000
    14
    0.182"
    6"1.82"Round
    0.182"Split
    000000000000
    13
    0.185"
    6"1.94"Round
    0.185"Split
    000000000000
    12
    0.189"
    6"1.93"Round
    0.189"Split
    000000000000
    11
    0.191"
    6"1.93"Round
    0.191"Split
    000000000000
    10
    0.1935"
    6"2.05"Round
    0.1935"Split
    000000000000
    9
    0.196"
    6"2.04"Round
    0.196"Split
    0000000000000
    8
    0.199"
    6"2.03"Round
    0.199"Split
    0000000000000
    7
    0.201"
    6"2.03"Round
    0.201"Split
    0000000000000
    6
    0.204"
    6"2.09"Round
    0.204"Split
    0000000000000
    5
    0.2055"
    6"2.08"Round
    0.2055"Split
    0000000000000
    4
    0.209"
    6"2.08"Round
    0.209"Split
    0000000000000
    3
    0.213"
    6"2.07"Round
    0.213"Split
    0000000000000
    2
    0.221"
    6"2.18"Round
    0.221"Split
    0000000000000
    1
    0.228"
    6"2.16"Round
    0.228"Split
    0000000000000
     
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