McMaster-Carr logo
    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)
    22 Products
    About Drill Bits
    industrial info icon

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

    Rebar-Cutting Core Drill Bits for Concrete

    Core out large holes in concrete, even if it's reinforced with rebar mesh. No need to switch bits, these have a diamond-coated edge that keeps on cutting and resists wear to stay sharp.
    Threaded-Hub Shank for Rotary Only Drilling
    Image of Product. Front orientation. Drill Bits. Rebar-Cutting Core Drill Bits for Concrete, Threaded-Hub Shank for Rotary Only Drilling.
    Bits are designed for wet drilling on a drilling rig. To avoid damage to bits and tools, do not use for dry drilling or with portable drills or grinders.
    Drill Bit
    Size
    Decimal Size
    Equiv.
    Overall
    Lg.
    Max. Drilling
    Dp.
    Shank
    Size
    Thread
    Size
    Bit ID
    Each
    Diamond Coated
     
    Standard Point
    1 3/4"
    		1.75"
    		15 1/2"13"1 3/4"1 1/4"-7
    		1 1/2"2872A540000000
    2"
    		2"
    		16 1/4"14.5"2"1 1/4"-7
    		1 3/4"2872A55000000
    2 1/4"
    		2.25"
    		15 1/2"13"2 1/4"1 1/4"-7
    		2"2872A34000000
    2 1/2"
    		2.5"
    		15 1/2"13"2 1/2"1 1/4"-7
    		2 1/4"2872A56000000
    2 3/4"
    		2.75"
    		15 1/2"13"2 3/4"1 1/4"-7
    		2 1/2"2872A35000000
    3"
    		3"
    		16 7/16"14.5"3"1 1/4"-7
    		2 3/4"2872A57000000
    3 1/2"
    		3.5"
    		15 1/2"13"3 1/2"1 1/4"-7
    		3 1/4"2872A37000000
    4"
    		4"
    		15 1/2"13"4"1 1/4"-7
    		3 3/4"2872A58000000
    4 1/2"
    		4.5"
    		15 1/2"13"4 1/2"1 1/4"-7
    		4 1/4"2872A59000000
    5"
    		5"
    		15 1/2"13"5"1 1/4"-7
    		4 3/4"2872A61000000
    6"
    		6"
    		15 1/2"13"6"1 1/4"-7
    		5 3/4"2872A62000000
    7"
    		7"
    		15 1/2"13"7"1 1/4"-7
    		6 3/4"2872A43000000
    8"
    		8"
    		15 1/2"13"8"1 1/4"-7
    		7 5/8"2872A63000000
    10"
    		10"
    		15 1/2"13"10"1 1/4"-7
    		9 5/8"2872A22000000
    12"
    		12"
    		15 1/2"13"12"1 1/4"-7
    		11 5/8"2872A23000000
     

    Drill Rig Thread Adapters for Rebar-Cutting Core Drill Bits

    Image of Product. Front orientation. Drill Rig Thread Adapters.
    Adapt a bit for use on a drilling rig with a different thread size.
    Thread
    Size
    Overall
    Lg.
    Male
    Female
    Each
    For Threaded-Hub-Shank Drill Bits
    5 3/8"5/8"-11
    		1 1/4"-7
    		2872A990000000
     

    Tap-Size Hollow-Core Cutters for Magnetic-Base Drills

    Image of Product. Front orientation. Hollow-Core Cutters. Tap-Size Hollow-Core Cutters for Magnetic-Base Drills.
    These cutters are perfectly sized for cutting holes that will be tapped later. Use them with magnetic-base drills. Unlike drill bits, these cut only on the periphery of the hole and produce a solid slug. They're also known as annular cutters.
    Hollow-Core Cutter Pilot Pins—Pilot pins align the cutter and eject the slug. They're also known as ejector pins.
    Cutters
    Hollow-Core
    Cutter Pilot Pins
    Dia.
    For Tap Thread
    Size
    For Pilot
    Pin Dia.
    Each
    Each
    High-Speed Steel
     
    2" Cutting Depth
    1 7/64"1 1/4"-7
    		1/4"6849A53000000031315A253000000
     
    Hollow-Core Cutter Arbor Adapters
    You can also pair the cutters with an arbor adapter (sold separately) when using a manual drill press or milling machine.
    Round Shank—Arbor adapters for a round shank fit a drill chuck or an R8 collet on a milling machine.
    Morse Taper Shank—Arbor adapters for a Morse Taper spindle are for use on a drill press.
    Shank Type
    Machine
    Taper No.
    Shank
    Dia.
    Overall
    Lg.
    Each
    For Cobalt Steel and High-Speed Steel
    Round—3/4"5 1/8"31315A2540000000
    Morse TaperMorse 2—6 1/4"31315A255000000
    Morse TaperMorse 3—6 1/4"31315A251000000
     

    Helical Threaded Inserts with Installation Tools

    Image of Product. Drill Bit, Installation Tool and Through-Hole Tap. Front orientation. Threaded Inserts. Helical Threaded Inserts with Installation Tools, Pronged, Drill Bit, Installation Tool, Through-Hole Tap.

    Drill Bit, Installation Tool

    and Through-Hole Tap

    Quickly restore stripped threads—these inserts come with through-hole taps and installation tools. The tough coils on these inserts expand once installed to anchor in a tapped hole.
    Pronged—The prong attaches to an installation tool for precise control as you drive inserts in. Remove the prong with a punch or break-off tool before inserting a screw.
    18-8 Stainless Steel—The choice for wet and outdoor environments, these inserts resist rust and mild chemicals.
    Thread
    Size
    Installed
    Lg.
    Drill Bit
    Size
    For Max.
    Hole Dia.
    No. of Inserts
    Included
    Includes
    Each
    Pronged
     
    18-8 Stainless Steel
    1 1/4"-7
    		1.875"1 9/32"
    		1.281"4Drill Bit
    Installation Tool
    Through-Hole Tap    		91732A3230000000
     
    back to top