McMaster-Carr logo
    Filter by
    System of Measurement
    Drill Bit Size
    Industrial Info Compare
    Attribute Image
    Length Class
    Industrial Info Compare
    Flute Direction
    Number of Flutes
    Overall Length
    Drill Bit Point Type
    Point Angle
    Industrial Info Snippet
    Attribute Image
    Screw Size
    Industrial Info Compare
    Countersink Angle
    Industrial Info Snippet
    Attribute Image
    Shank Size
    Maximum Drilling Depth
    Attribute Image
    Length
    For Wood Type
    Decimal Size Equivalent
    Body Diameter
    U.S.–Mexico–Canada Agreement (USMCA) Qualifying
    DFARS Specialty Metals
    Export Control Classification Number (ECCN)
    Industrial Info Snippet
    Forward
    Enter e-mail addresses in the fields below
    Message
    Cancel
    Print
    How can we improve?
    Comments
    E-mail address (if you would like a response)
    3 Products
    About Drill Bits
    industrial info icon

    Compare material, finish, length class, and decimal size equivalents.

    Coolant-Fed Carbide Drill Bits

    Image of Product. Side1 orientation. Drill Bits. Coolant-Fed Carbide Drill Bits, Maintenance Length, Round Shank.

    Maintenance Length

    Round Shank

    The hardest and most wear-resistant bits, these deliver coolant to reduce heat and evacuate chips. They are designed for CNC machines that supply coolant through the spindle rather than an external source, such as a hose and nozzle. Coolant flows directly from holes in the bit's tip onto the drilling surface. This speeds up cuts and leads to excellent performance in deep holes and tough materials such as stainless steel and titanium.
    Maintenance Length—Shorter than jobbers' length, these bits are more rigid for less wobble when drilling hard material. Also known as mechanics’ bits.
    Titanium Aluminum Nitride (TiAlN) Coated—No drill bits last longer. These are the best for high-speed, high-temperature drilling of very hard and abrasive materials, including titanium and fiberglass.
    Shank
    Drill Bit
    Size
    Decimal Size
    Equiv.
    Overall
    Lg.
    Max. Drilling
    Dp.
    Type
    Size
    Drill Bit Point
    Type
    Each
    Maintenance Length
     
    Titanium Aluminum Nitride (TiAlN) Coated
    5/16"
    		0.3125"
    		3 3/32"1.47"Round
    		5/16"Four Facet
    		2396N871000000
     

    Quick-Change Hex Drill-Bit Countersinks for Wood and Plastic

    Switch bits instead of tools to simplify jobs. These snap directly into drills, power screwdrivers, and other tools that accept a 1/4" hex shank. You can slide the countersink up and down the drill bit and then secure it with a set screw, so one tool will drill countersunk holes for screws of different lengths. These countersinks cut a smooth and even finish in wood and plastic on the first pass.
    High-Speed Steel
    Image of Product. Front orientation. Countersinks. For Cutting Screw Holes, Drill-Bit Countersink, For Wood, Straight Flute, Quick-Change Hex Shank, Sold Individually, 1 Countersinking End, 2 Flutes.

    2 Flutes

    The choice if you're countersinking lots of holes, these wear-resistant countersinks cut faster and last longer than carbon steel.
    Manufacturer—We source from trusted manufacturers who vet raw materials for purity and use diamond grinding wheels to machine precise edges. This keeps cutting surfaces smooth and free of microscopic burrs. Because our suppliers clean their wheels more often than other manufacturers, each countersink is consistently ground to create uniform holes every time.
    Countersinks
    Replacement
    Drill Bits
    For
    Screw Size
    Uncoated
    Body
    Dia.
    Max. Hole
    Drilling Dp.
    Hard
    Wood
    Soft
    Wood
    Overall
    Lg.
    Shank
    Size
    Shank Type
    Mfr.
    Each
    Each
    2 Flutes
     
    82° Countersink Angle
    1/2"1"No. 10
    		No. 12
    		3 3/32"1/4"Quick-Change HexMake It Snappy Tools2747A25000008870A1900000
     
    back to top