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    33 Products
    About Drill Bits
    industrial info icon

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

    High-Speed Steel Drill Bits

    Image of Product. Front orientation. Drill Bits. High-Speed Steel Drill Bits, Jobbers' Length, Morse Taper Shank.

    Jobbers' Length

    Morse Taper Shank

    Image of Product. Front orientation. Drill Bits. High-Speed Steel Drill Bits, Extended Length, Round Shank.

    Extended Length

    Round Shank

    Image of Specification. Standard. Front orientation. Contains Border. Standard Point. For Metal.

    Standard

    Our basic drill bits are also the most versatile. Cut holes in a variety of metals, from the softest aluminum to the hardest steel.
    Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.
    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.
    Black Oxide—The dark finish increases wear resistance and reduces friction to improve chip flow, so these bits can last 50% longer than uncoated bits.
    Shank
    Drill Bit
    Size
    Decimal Size
    Equiv.
    Overall
    Lg.
    Max. Drilling
    Dp.
    Type
    Size
    Drill Bit
    Point Type
    Mfr.
    Each
    Jobbers' Length
     
    Black Oxide
    29/64"
    		0.4531"
    		7 1/2"3.44"Morse Taper
    		Morse 1Standard
    		Chicago-Latrobe2929A362000000
     
    Extended Length
     
    Black Oxide
    29/64"
    		0.4531"
    		7 1/2"4.07"Round
    		29/64"Standard
    		Chicago-Latrobe29315A15400000
    15/32"
    		0.4688"
    		7 1/2"4.04"Round
    		15/32"Standard
    		Chicago-Latrobe29315A15500000
     

    Cobalt Steel Drill Bits

    Image of Product. Front orientation. Drill Bits. Cobalt Steel Drill Bits, Jobbers' Length, Morse Taper Shank.

    Jobbers' Length

    Morse Taper Shank

    Image of Specification. Split. Front orientation. Contains Border. Split Point. For Metal.

    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.
    Jobbers' Length—These bits have the balance of rigidity and length needed for most applications.
    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
    Mfr.
    Each
    Jobbers' Length
     
    Uncoated
    25/64"
    		0.3906"
    		7 1/2"3.63"Morse Taper
    		Morse 2Split
    		Republic Drill3068A213000000
    13/32"
    		0.4063"
    		7 1/2"3.63"Morse Taper
    		Morse 2Split
    		Republic Drill3068A1600000
     

    Tapping Screw Installation Drill Bits for Masonry and Concrete

    Create an undersized hole so concrete tapping screws fit tightly once they're threaded into place. These bits are slightly smaller than the matching screw size. They have a carbide tip that resists wear and heat to stay sharp.
    Round Shank for Hammer and Rotary Drilling
    Image of Product. Front orientation. Drill Bits. Tapping Screw Installation Drill Bits for Masonry and Concrete, Round Shank for Hammer and Rotary Drilling.
    Use these bits in rotary hammers that have a drill chuck. Simultaneous rotary and hammering action drills faster and penetrates material with less pressure than rotary-only bits. Also known as percussion or impact bits.
    For Screw
    Size
    Drill Bit
    Size
    Decimal Size
    Equiv.
    Overall
    Lg.
    Max. Drilling
    Dp.
    Shank
    Size
    Features
    Mfr.
    Each
    Uncoated
     
    Standard Point
    1/4"
    		3/16"
    		0.1875"
    		7 1/2"6"5/32"Flat on ShankTru-Cut90161A72800000
     

    Light Duty Air-Powered Drills

    Image of Product. Front orientation. Drills. Light Duty Air-Powered Drills, Style A.
    Image of Product. Front orientation. Drills. Light Duty Air-Powered Drills, Style B.

    Style A

    Style B

    Designed for intermittent use.
    Keyless Chuck—Drills with keyless chuck open and close without a key for fast bit changes.
    Keyed Chuck—Drills with keyed chuck can be tightened with the included key.
    Air Inlet
    Style
    For Max. Bit
    Shank Size
    Max. No-Load Rotational
    Speed, rpm
    Drive Direction
    Chuck
    Type
    Power,
    hp
    Average Air Consumption
    @ Pressure
    Pipe
    Size
    Thread
    Type
    Gender
    Exhaust
    Location
    Overall
    Lg.
    Wt.,
    lb.
    Each
    For Hex and Round Bit Shanks
    A3/8"2,000Clockwise, CounterclockwiseKeyed1/24 ft³/min @ 90 psi1/4
    		NPT
    		FemaleBack7 1/2"2.527755A17000000
    B3/8"2,000Clockwise, CounterclockwiseKeyless1/24 ft³/min @ 90 psi1/4
    		NPT
    		FemaleBack7 1/2"2.527755A2200000
     

    Flexible Bit Adapters

    Image of Product. Front orientation. Bit Adapters. Flexible Bit Adapters.
    Bend these adapters up to 90° to access hard-to-reach fasteners. Use hex-shank bits (also known as insert bits) in drills and powered screwdrivers.
    Hex Shank
    Size
    For Bit
    Shank Type
    For Bit Hex
    Shank Size
    For Max. Drill
    Torque, in·lbf
    Overall
    Lg.
    Material
    Each
    Magnet Bit Holder
    1/4"Hex
    		1/4"427 1/2"Steel
    		85255A11000000
     

    Built-in-Pilot Counterbores

    A pilot centers these counterbores and prevents wobbling for an accurate cut on the first try. With dimensions that match standard screw-head diameters and thread diameters, they are your plug-and-play option for pilot-driven counterbores.
    Metric counterbores have undersized pilots to meet DIN standards.
    High-Speed SteelAbout High-Speed Steel
    Image of Product. Front orientation. ZoomedIn view. Counterbores. Built-in-Pilot Counterbores.
    Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
    Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion for longer than uncoated counterbores, so the cutting edges stay sharper.
    Pilot
    Shank
    Uncoated
    Titanium Nitride
    (TiN) Coated
    For Screw
    Size
    Body
    Dia.
    Dia.
    Lg.
    Overall
    Lg.
    Dia.
    Type
    No. of
    Flutes
    Mfr.
    Each
    Each
    1/2"
    		0.757"1/2"0.500"7 1/2"1/2"Round
    		4Alvord-Polk Tool2919A4100000028225A410000000
     
    Carbide-Tipped Steel
    Image of Product. Front orientation. ZoomedIn view. Counterbores. Built-in-Pilot Counterbores.
    The hardest and most wear-resistant counterbores we offer. These bits stay sharper at higher temperatures and faster speeds for the best performance on hard and abrasive materials.
    Pilot
    Shank
    Uncoated
    For Screw
    Size
    Body
    Dia.
    Dia.
    Lg.
    Overall
    Lg.
    Dia.
    Type
    No. of
    Flutes
    Mfr.
    Each
    1/2"
    		0.757"1/2"0.500"7 1/2"1/2"Round
    		3Rock River Tool3218A1510000000
     

    Oversized Counterbores

    Designed to give screw heads a slightly loose fit, these counterbores are a bit wider than standard sizes. The extra clearance prevents binding and leaves room for a seal or O-ring around the screw head.
    High-Speed SteelAbout High-Speed Steel
    Image of Product. Front orientation. ZoomedIn view. Counterbores. Oversized Counterbores.
    Durable and wear resistant, these counterbores make accurate cuts in most materials without chipping or cracking.
    Titanium Nitride (TiN) Coated—Withstand heat, corrosion, and abrasion for longer than uncoated counterbores, so the cutting edges stay sharper.
    Pilot
    Shank
    Uncoated
    Titanium Nitride
    (TiN) Coated
    For Screw
    Size
    Body
    Dia.
    Dia.
    Lg.
    Overall
    Lg.
    Dia.
    Type
    No. of
    Flutes
    Mfr.
    Each
    Each
    1/64" Oversize
    1/2"
    		0.773"0.515"0.500"7 1/2"1/2"Round
    		4Alvord-Polk Tool2919A6100000028225A610000000
     
    1/32" Oversize
    1/2"
    		0.788"0.531"0.500"7 1/2"1/2"Round
    		4Alvord-Polk Tool2919A810000028225A81000000
     
    0.5 mm Oversize
    M14
    		21.5 mm14.5 mm0.563"7 1/2"5/8"Round
    		4Alvord-Polk Tool2740A18000000———0
     
    Carbide-Tipped Steel
    Image of Product. Front orientation. ZoomedIn view. Counterbores. Oversized Counterbores.
    The hardest and most wear-resistant counterbores we offer. These bits stay sharper at higher temperatures and faster speeds for the best performance on hard and abrasive materials.
    Pilot
    Shank
    Uncoated
    For Screw
    Size
    Body
    Dia.
    Dia.
    Lg.
    Overall
    Lg.
    Dia.
    Type
    No. of
    Flutes
    Mfr.
    Each
    1/64" Oversize
    1/2"
    		0.773"33/64"0.500"7 1/2"1/2"Round
    		3Rock River Tool3218A1530000000
     
    1/32" Oversize
    1/2"
    		0.788"17/32"0.500"7 1/2"1/2"Round
    		3Rock River Tool3218A152000000
     

    Reamers

    Finish holes to precise inch, metric, wire gauge, or letter sizes with these reamers.
    Adjustable Size, Square Shank
    Finish multiple hole sizes with one reamer by moving the adjustable blades within the diameter range. Convenient for maintenance work, these have a large diameter range and don't require powered tools. They're often used to make precise size adjustments during installation of bearings and bushings.
    Move the blades by tightening and loosening the two nuts on the reamer. To measure size, adjust blades to a known size (such as a bushing or ring), or measure across two opposite blades with a micrometer. When the blades become worn, they can be reground or replaced.
    Turn these reamers by hand with an adjustable wrench or straight-handle tap wrench (sold separately).
    Extension pilots (not included) can be used in place of the end adjustment nut to align holes that are spaced far apart.
    Straight Blade—Use these reamers in straight holes that don't have a keyway or other breaks in the surface.
    Angled Blade—These reamers are better than those with straight blades for finishing holes with breaks in the surface, such as a keyway.
    High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.
    Tool Steel—Typically more economical but less durable than high-speed steel, these are for general purpose reaming.
    Reamers
    Replacement Blades
    Optional
    Extension Pilots
    Reamer Dia.
    Material
    Square Shank
    Size
    Overall
    Lg.
    No. of
    Blades
    For Use On
    Mfr.
    Each
    Pkg.
    Qty.
    Pkg.
    Each
    Straight Blade
    Image of Product. Front orientation. Reamers. Reamers, Adjustable Size, Square Shank, Straight Blade.
     
    Inch
    0.7813" to 0.8438" (25/32" to 27/32")High-Speed Steel
    		0.4060"7 1/2"6Aluminum, Brass, Bronze, Fiberglass, Iron, Plastic, Stainless Steel, Steel, Titanium, Tool Steel, Hardened SteelChadwick & Trefethen3141A17000000063141A4600000003004A18000000
     
    Angled Blade
    Image of Product. Front orientation. Reamers. Reamers, Adjustable Size, Square Shank, Angled Blade.
     
    Inch
    0.7813" to 0.8438" (25/32" to 27/32")Tool Steel
    		0.4060"7 1/2"6Aluminum, Brass, Bronze, Fiberglass, Iron, Plastic, Steel, TitaniumChadwick & Trefethen2987A1600000062987A56000003004A1800000
    0.8125" to 0.8750" (13/16" to 7/8")Tool Steel
    		0.4060"7 1/2"6Aluminum, Brass, Bronze, Fiberglass, Iron, Plastic, Steel, TitaniumChadwick & Trefethen2987A3500000062987A75000003004A1800000
     
    Expandable Flutes, Square Shank
    Image of Product. Front orientation. Contains Annotated. Reamers. Reamers, Expandable Flutes, Square Shank, Straight Flute.
    Image of Product. Front orientation. Contains Annotated. Reamers. Reamers, Expandable Flutes, Square Shank, Spiral Flute.

    Straight Flute

    Spiral Flute

    Unlike standard reamers, which are unusable once they become worn, these can be returned to their original size for finishing holes. After the reamer is worn down, tighten the set screw to expand the diameter, grind the reamer to its original size, and get back to work.
    These are not designed for producing holes larger than the listed diameter or for producing holes of various sizes. The set screw should not be loosened.
    Turn these reamers by hand with an adjustable wrench or straight-handle tap wrench (sold separately).
    Straight Flute—The most common flute style, these reamers are suitable for a wide range of applications, but not recommended for holes with a keyway or other breaks in the surface.
    Spiral Flute—Since these reamers clear chips better than straight flutes, they leave holes with a smoother finish. They're better for holes with breaks in the surface, such as a keyway, because they cut continuously across the breaks instead of moving in and out.
    High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.
    Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.
    Reamers
    Optional
    Straight-Handle Tap Wrenches
    Lg.
    Reamer Dia.
    Material
    Square Shank
    Size
    Flute
    Overall
    No. of
    Flutes
    Spiral
    Direction
    Cutting Dia.
    Tolerance
    Recommended Expansion
    Limit
    For Use On
    Mfr.
    Each
    Each
    Straight Flute
     
    Inch
    0.8750" (7/8")High-Speed Steel
    		0.655"3 5/16"7 1/2"8—-0.0005" to 0"0.013"Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, SteelRepublic Drill2993A6600000002546A190000000
     
    Spiral Flute
     
    Inch
    0.8750" (7/8")High-Speed Steel
    		0.655"3 5/16"7 1/2"8Left Hand-0.0005" to 0"0.013"Aluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, SteelRepublic Drill2993A890000002546A19000000
     

    Reamers for Hole Alignment

    Enlarge holes to correct misalignment and overlap. Misaligned holes often have a narrow entry, so the tapered shape is easier to insert and makes more contact to remove the overlapping material. These are also known as bridge and car reamers.
    Round Shank
    Image of Product. Front orientation. Contains Annotated. Reamers. Reamers for Hole Alignment, Round Shank, Spiral Flute, Depth Limiting.

    Spiral Flute

    Depth Limiting

    These reamers fit in the chuck of drill presses, turret lathes, and other machine and power tools, making them the most common shank type.
    Spiral Flute—Since these reamers clear chips better than straight flutes, they leave holes with a smoother finish. They're better for holes with breaks in the surface, such as a keyway, because they cut continuously across the breaks instead of moving in and out.
    High-Speed Steel—Durable and wear resistant, these are good for general purpose reaming in most materials.
    Left-Hand Spiral—These reamers push chips downward as they cut, so they're often used in through holes.
    Depth Limiting—A collar on the shank prevents these reamers from going too deep into material, protecting your tool's chuck from damage.
    Lg.
    Reamer Dia. (A)
    Reamer Dia.
    (B)
    Material
    Flute
    Overall
    Spiral
    Direction
    Cutting Dia.
    Tolerance
    Performance
    For Use On
    Mfr.
    Each
    Spiral Flute
     
    Inch
    1.2500" (1 1/4")0.8750"High-Speed Steel
    		5 3/8"7 1/2"Left Hand0" to 0.005"Depth LimitingAluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, SteelAlvord-Polk Tool2743A380000000
    1.3125" (1 5/16")0.8906"High-Speed Steel
    		5 3/8"7 1/2"Left Hand0" to 0.005"Depth LimitingAluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, SteelAlvord-Polk Tool2743A39000000
    1.3750" (1 3/8")1.0156"High-Speed Steel
    		5 3/8"7 1/2"Left Hand0" to 0.005"Depth LimitingAluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, SteelAlvord-Polk Tool2743A41000000
    1.5000" (1 1/2")1.0781"High-Speed Steel
    		5 3/8"7 1/2"Left Hand0" to 0.005"Depth LimitingAluminum, Brass, Bronze, Iron, Plastic, Stainless Steel, SteelAlvord-Polk Tool2743A43000000
     
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