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    24 Products

    Countersink Drill Bits for Taps

    Image of Product. Front orientation. ZoomedIn view. Countersink Drill Bits. Countersink Drill Bits for Taps.
    Also called subland drill bits, these bits countersink as they drill to prepare holes for tapping. The 90° countersink angle guides the tap into the hole. The drill bit diameter will not change after sharpening.
    Dia.
    Lg.
    90°
    Countersink Angle
    For Tap Thread
    Size
    Body
    Step
    Step
    Overall
    Shank
    Dia.
    Point
    Angle
    For Use On
    Each
    Uncoated High-Speed Steel
     
    2 Flutes
    6-32
    0.156"0.107"5/16"3 1/8"0.156"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A71000000
    8-32
    0.188"0.136"3/8"3 1/2"0.188"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A7200000
    10-32
    0.219"0.159"1/2"3 3/4"0.219"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A7400000
    1/4"-20
    0.281"0.201"1/2"4 1/4"0.281"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A7500000
    1/4"-28
    0.313"0.213"5/8"4 1/2"0.313"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A7600000
    5/16"-18
    0.438"0.257"11/16"5 1/2"0.438"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A7700000
    5/16"-24
    3/8"0.272"11/16"5"3/8"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A7800000
    3/8"-16
    0.438"0.313"3/4"5 1/2"0.438"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A7900000
    7/16"-14
    1/2"0.368"3/4"6"1/2"118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29475A8100000
     

    Oversized Long-Life Counterbore Drill Bits

    Image of Product. Front orientation. Contains Annotated. Counterbore Drill Bits. Oversized Long-Life Counterbore Drill Bits.
    These counterbores are often used when screw holes in sheets or layers are misaligned. Also known as subland drill bits, they last longer than standard counterbore drill bits because the diameter stays the same after sharpening. They drill and counterbore at the same time. After drilling and counterboring, tap the hole and install your fastener. The diameters account for the 1/32” or 1/64” oversized diameter rating.
    Dia.
    Lg.
    For Screw
    Size
    Body
    Step
    Step
    Overall
    No. of
    Flutes
    Point
    Angle
    For Use On
    Each
    Uncoated High-Speed Steel
     
    1/64" Oversize
    No. 6
    0.234"0.146"5/16"2 7/16"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A41000000
    No. 8
    0.281"0.175"3/8"4 1/4"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A4700000
    No. 10
    0.328"0.206"5/8"4 5/8"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A4900000
    No. 10
    0.344"0.206"1/2"4 3/4"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A5100000
    1/4"
    0.391"0.266"1/2"5 1/8"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A5400000
    1/4"
    0.406"0.266"1/2"5 1/4"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A7100000
    3/8"
    0.578"0.391"3/4"4 1/8"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A6300000
     
    1/32" Oversize
    1/4"
    0.406"0.281"1/2"5 1/4"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A5500000
    5/16"
    1/2"0.344"5/8"6"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A6200000
    3/8"
    0.594"0.406"3/4"4 1/8"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A6400000
     

    Long-Life Counterbore Drill Bits

    Image of Product. Front orientation. Contains Annotated. Counterbore Drill Bits. Long-Life Counterbore Drill Bits.
    Also known as subland drill bits, these last longer than standard counterbore drill bits because the diameter stays the same after sharpening. They drill and counterbore at the same time. After drilling and counterboring, tap the hole and install your fastener.
    Dia.
    Lg.
    For Screw
    Size
    Body
    Step
    Step
    Overall
    No. of
    Flutes
    Point
    Angle
    For Use On
    Each
    Uncoated High-Speed Steel
    No. 6
    0.228"0.141"5/16"3 7/8"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A42000000
    No. 8
    0.272"0.164"3/8"2 11/16"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A4400000
    No. 10
    0.313"0.190"1/2"2 13/16"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A4800000
    1/4"
    0.375"0.250"1/2"5"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A5300000
    5/16"
    0.469"0.313"5/8"3 5/8"2118°Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, Steel29525A5600000
     
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