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    136 Products

    R8 Collets

    Image of Product. Front orientation. Milling Machine Collets. R8 Collets.
    Grip cutting tools in the R8 taper spindle of your Bridgeport or other milling machine. These collets thread onto your machine’s drawbar, pulling them into the spindle so they can clamp tightly around your bit.
    The lower the runout, the higher the accuracy and the longer the tool life.
    0.0008" Total Indicated Runout (TIR) Accuracy—An accuracy of 0.0008” works well for roughing and heavy material removal, where tight tolerances aren't critical.
    Collet
    Size
    ID Tolerance
    Body
    Dia.
    Overall
    Lg.
    Internal
    Thread Size
    Each
    Hardened Steel—0.0002" Total Indicated Runout (TIR) Accuracy
    1/16"-0.004" to 0"0.95"4.089"7/16"-20
    3257A61000000
    3/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A6200000
    1/8"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1100000
    5/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1200000
    3/16"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1300000
    7/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1400000
    1/4"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1500000
    9/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1600000
    5/16"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1700000
    11/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1800000
    3/8"-0.004" to 0"0.95"4.089"7/16"-20
    3257A1900000
    13/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2100000
    7/16"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2200000
    15/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2300000
    1/2"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2400000
    17/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2500000
    9/16"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2600000
    19/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A6300000
    5/8"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2800000
    21/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A2900000
    11/16"-0.004" to 0"0.95"4.089"7/16"-20
    3257A3100000
    23/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A3200000
    3/4"-0.004" to 0"0.95"4.089"7/16"-20
    3257A3300000
    25/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A3400000
    13/16"-0.004" to 0"0.95"4.089"7/16"-20
    3257A3500000
    27/32"-0.004" to 0"0.95"4.089"7/16"-20
    3257A3600000
    7/8"-0.004" to 0"0.95"4.089"7/16"-20
    3257A3700000
    1"-0.004" to 0"0.95"5.1"7/16"-20
    3257A6400000
    3 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4100000
    4 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4200000
    5 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4300000
    6 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4400000
    7 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4500000
    8 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4600000
    9 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4700000
    10 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4800000
    11 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A4900000
    12 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5100000
    13 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5200000
    14 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5300000
    15 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5400000
    16 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5500000
    17 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5600000
    18 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5700000
    19 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5800000
    20 mm-0.004" to 0"0.95"4.089"7/16"-20
    3257A5900000
     
    Hardened Steel—0.0008" Total Indicated Runout (TIR) Accuracy
    3/32"-0.004" to 0"0.95"4.134"7/16"-20
    3257A33500000
    1/8"0" to 0.001"0.95"4.134"7/16"-20
    3257A30300000
    5/32"0" to 0.001"0.95"4.134"7/16"-20
    3257A30400000
    3/16"0" to 0.001"0.95"4.134"7/16"-20
    3257A30500000
    7/32"0" to 0.001"0.95"4.134"7/16"-20
    3257A30600000
    1/4"0" to 0.001"0.95"4.134"7/16"-20
    3257A30700000
    9/32"0" to 0.001"0.95"4.134"7/16"-20
    3257A30800000
    5/16"0" to 0.001"0.95"4.134"7/16"-20
    3257A30900000
    11/32"0" to 0.001"0.95"4.134"7/16"-20
    3257A31100000
    3/8"0" to 0.001"0.95"4.134"7/16"-20
    3257A31200000
    13/32"0" to 0.001"0.95"4.134"7/16"-20
    3257A31300000
    7/16"0" to 0.001"0.95"4.134"7/16"-20
    3257A31400000
    15/32"0" to 0.001"0.95"4.134"7/16"-20
    3257A31500000
    1/2"0" to 0.001"0.95"4.134"7/16"-20
    3257A31600000
    9/16"0" to 0.001"0.95"4.134"7/16"-20
    3257A31700000
    5/8"0" to 0.001"0.95"4.134"7/16"-20
    3257A31800000
    3/4"0" to 0.001"0.95"4.134"7/16"-20
    3257A31900000
    7/8"-0.004" to 0"0.95"4.134"7/16"-20
    3257A33600000
    2 mm-0.004" to 0"0.95"4.134"7/16"-20
    3257A33700000
    3 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32100000
    4 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32200000
    5 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32300000
    6 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32400000
    7 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32500000
    8 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32600000
    9 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32700000
    10 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32800000
    12 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A32900000
    14 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A33100000
    16 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A33200000
    18 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A33300000
    20 mm0" to 0.001"0.95"4.134"7/16"-20
    3257A33400000
     

    R8 Collet Sets

    Image of Product. Front orientation. Milling Machine Collets. R8 Collet Sets.
    Keep a set of R8 collets on hand to hold cutting tools in the spindle of your Bridgeport or other milling machine. These collets thread onto your machine’s drawbar, pulling them into the spindle so they can clamp tightly around your bit.
    The lower the runout, the higher the accuracy and the longer the tool life.
    0.0008" Total Indicated Runout (TIR) Accuracy—An accuracy of 0.0008" works well for roughing and heavy material removal, where tight tolerances aren't critical.
    No. of
    Pieces
    Collet Sizes Included
    ID Tolerance
    Body
    Dia.
    Overall
    Lg.
    Internal
    Thread Size
    Container
    Type
    Each
    Hardened Steel—0.0002" Total Indicated Runout (TIR) Accuracy
    81/8"-1" (increments of 1/8")-0.004" to 0"0.95"4.089"7/16"-20
    3257A650000000
    131/8"-7/8" (increments of 1/16")-0.004" to 0"0.95"4.089"7/16"-20
    3257A66000000
    183 mm-20 mm (increments of 1 mm)-0.004" to 0"0.95"4.089"7/16"-20
    3257A69000000
    271/16"-7/8" (increments of 1/32")-0.004" to 0"0.95"4.089"7/16"-20
    3257A68000000
     
    Hardened Steel—0.0008" Total Indicated Runout (TIR) Accuracy
    201/8"-3/4" (increments of 1/32", excludes 17/32")0" to 0.001"0.95"4.089"7/16"-20
    Plastic Case3257A71000000
     

    R8 Taper End Mill Holders

    Image of Product. Front orientation. Contains Annotated. End Mill Holders. R8 Taper End Mill Holders.
    Hold end mills, drills, and reamers securely in manual milling machines that have an R8 taper spindle. Holders are ground to accurate size.
    Head
    For End Mill
    Shank Dia.
    For No. of End
    Mill Milling Ends
    Internal
    Thread Size
    Dia.
    Lg.
    Material
    Fabrication
    Includes
    Each
    1/8"17/16"-20
    3/4"1 3/8"Steel
    Heat TreatedSet Screws8781A33000000
    3/16"1, 27/16"-20
    3/4"1 3/8"Steel
    Heat TreatedSet Screws8781A2100000
    1/4"1, 27/16"-20
    51/64"1 3/8"Steel
    Heat TreatedSet Screws8781A3200000
    5/16"17/16"-20
    7/8"1 3/4"Steel
    Heat TreatedSet Screws8781A3400000
    3/8"1, 27/16"-20
    1"1 3/8"Steel
    Heat TreatedSet Screws8781A2200000
    1/2"17/16"-20
    1 3/8"1 3/8"Steel
    Heat TreatedSet Screws8781A2300000
    5/8"17/16"-20
    1 21/32"1 1/2"Steel
    Heat TreatedSet Screws8781A2400000
    3/4"17/16"-20
    1 57/64"2 3/8"Steel
    Heat TreatedSet Screws8781A25000000
    7/8"17/16"-20
    2"2 3/4"Steel
    Heat TreatedSet Screws8781A26000000
    1"17/16"-20
    2 3/8"3 1/4"Steel
    Heat TreatedSet Screws8781A27000000
    1 1/4"17/16"-20
    2 1/2"3 1/4"Steel
    Heat TreatedSet Screws8781A28000000
    1 1/2"17/16"-20
    3"3 3/4"Steel
    Heat TreatedSet Screws8781A29000000

    Quick-Change Milling Machine Tool Holders

    Image of System. Front orientation. Exploded view. Contains Annotated, MultipleImages. Milling Machine Tool Holders. Quick-Change Milling Machine Tool Holders.
    Swap tool holders in seconds without a wrench. This R8 quick-change system replaces conventional drawbar setups that require multiple turns to change tooling. A brass locking button and spring-loaded collar allow one-handed tool changes, so you can move quickly between drilling, milling, and facing operations. The R8 body installs in your milling machine spindle, letting you switch holders to reduce downtime between operations.
    R8 Body
    Image of Product. Front orientation. Milling Machine Tool Holders. Quick-Change Milling Machine Tool Holders, R8 Body.
    R8 Taper
    Shank Thread
    Total Indicated Runout
    (TIR) Accuracy
    Gender
    Size
    Spindle
    Overhang
    Material
    Each
    0.0005"Female7/16"-20
    1 1/8"Steel
    2012N11000000000

    Machine-Your-Own R8 Collets

    Image of Product. Front orientation. Milling Machine Collets. Machine-Your-Own R8 Collets.
    Create custom collets in the exact size and shape you need. The face on these collets can be machined to match workpieces and bits with hex and square shanks or sized to ¹⁄₆₄" increments. Also known as emergency collets.
    These collets thread onto your machine’s drawbar for a secure connection. Use the included spreader pins to hold the face open while machining the cavity.
    Max. Bore
    Dia.
    Body
    Dia.
    Overall
    Lg.
    Face Pilot
    Hole Dia.
    Internal
    Thread Size
    Material
    Each
    3/4"0.95"4.089"1/16"7/16"-20
    Steel
    9634N11000000

    R8 Collet Stands

    Image of Product. Front orientation. Collet Stands. R8 Collet Stands, For 17 Collets.
    Image of Product. Front orientation. Collet Stands. R8 Collet Stands, For 32 Collets.

    For 17 Collets

    For 32 Collets

    Holds R8 collets upright and organized at the machine, keeping each collet visible and accessible without digging through a drawer.
    Overall
    Mounting
    Hole
    Mounting
    Slot
    For No.
    of Collets
    Ht.
    Wd.
    Dp.
    No.
    of
    Dia.
    No.
    of
    Wd.
    Lg.
    Material
    Each
    175 1/2"9"5 1/4"61/4"Steel
    8908A11000000
    323 1/2"8"10 1/2"21/4"3 3/8"Steel
    8908A1700000

    R8 Taper to Morse Taper Shank Adapters

    Image of Product. Front orientation. Contains Annotated. Machine Taper Shank Adapters. R8 Taper to Morse Taper Shank Adapters.
    Image of Attribute. Front orientation. Contains Annotated. R8 Taper to Morse Taper Shank Adapters.
    Adapt machines with R8 taper spindles to mount tools with a Morse taper shank, including drill bits, drill chucks, and reamers. These adapters are made of hardened steel and are precision ground for accuracy. They thread onto your machine’s drawbar for a secure connection.
    Slide your tool into these adapters and then press firmly to seat it. To separate them, use a Morse taper removal tool.
    Shank
    Type
    For Machine
    Taper No.
    Projection
    Material
    Each
    R8 TaperMorse 27/16"Hardened Steel8784A14000000
    R8 TaperMorse 32 1/2"Hardened Steel8784A15000000

    R8 Taper Collet Chucks

    Image of Specification. Front orientation. Contains Annotated. Milling Machine Collet Chucks. R8 Taper Collet Chucks.
    Hold collets tightly in Bridgeport and other manual machines with R8 spindles to grip tools for milling, drilling, and routing. These chucks let you use the same ER or TG collets as other machines. This reduces the number of collets you need while also giving you a strong grip on your tools. Insert your collet and tighten the nut to clamp your tool in place. Internal threads on the shank let you connect them to your machine’s drawbar system.
    To maximize grip and minimize runout, choose a chuck where your tool diameter falls in the middle of the bit shank size range.
    Collet Stop Screw—Chucks with a collet stop screw set the tool depth in the chuck for consistent, repeatable performance when you change tools.
    Milling Machine Collet Chucks
    Wrenches
    Replacement Nuts
    For Collet
    Type
    For Bit Shank
    Size
    Projection
    Total Indicated Runout
    (TIR) Accuracy
    Material
    Collet Nut
    Type
    Features
    Each
    Each
    Each
    ER-160.019" to 0.406"1.25"0.0001"Hardened Alloy SteelHex NutCollet Stop Screw9523N1300000003215A4410000009502N33000000
    ER-200.039" to 0.551"2"0.0001"Hardened Alloy SteelHex NutCollet Stop Screw9523N140000001721N15000009502N3400000
    ER-250.039" to 0.629"2.5"0.0001"Hardened Alloy SteelSlotted NutCollet Stop Screw9523N150000005699N128000009502N3500000
    ER-320.078" to 0.787"2.25"0.0002"Hardened Alloy SteelSlotted Nut9523N110000003321A32000009502N1500000
    ER-400.118" to 1.024"2.375"0.0002"Hardened Alloy SteelSlotted Nut9523N1200000032605A95000009502N1600000
    TG-1000.0469" to 1"3.25"0.0001"Hardened Alloy SteelSlotted NutCollet Stop Screw9523N1600000032605A95000009531N1200000
     

    Drill Chucks with R8 Taper Integral Arbor

    Image of Product. Front orientation. Drill Chucks. Drill Chucks with R8 Taper Integral Arbor, Keyless Chuck.
    Image of Product. Back orientation. Drill Chucks. Drill Chucks with R8 Taper Integral Arbor, Keyed Chuck.

    Keyless

    Chuck

    Keyed

    Chuck

    Minimize runout and slippage under heavy cutting forces from drill presses and Bridgeport milling machines. These chucks have an integrated arbor for a one-piece design that makes them more accurate and compact than chucks with a separate arbor. Made of hardened steel, they resist wear from repeated use. They thread onto your machine’s drawbar for a secure connection.
    To maximize grip and minimize runout, choose a chuck where your drill bit diameter falls in the middle of the bit shank size range.
    Keyless Chuck—Keyless chucks let you swap bits in and out with a quick twist of the sleeve. As torque increases, their grip will tighten. These chucks only tighten in the clockwise direction, so they may loosen under heavy reverse loads, such as during left-hand drilling.
    Keyed Chuck—Keyed chucks use a worm-and-gear design to deliver exceptional grip on bits for the highest torque and accuracy when drilling in hard materials. They're so strong they can even be used for light duty milling in soft materials such as aluminum. Use their Torx key to tighten and loosen the chuck.
    McMaster-Carr Approved—McMaster-Carr approved chucks are made on the same equipment that once produced Jacobs chucks in Europe, so you get high-quality performance without the brand-name price.
    Albrecht—Albrecht chucks are known for their unmatched quality. Made in Germany, every chuck undergoes multiple inspections and tests to ensure they operate smoothly and keep your bits aligned over their long life.
    For Bit Shank
    Size
    Max. No-Load Rotational
    Speed, rpm
    Total Indicated Runout
    (TIR) Accuracy
    Jaw Material
    Body Material
    Projection
    Max. Body
    Dia.
    For Tool Drive Direction
    Mfr. Model
    No.
    Features
    Includes
    Certificate Type
    Each
    Keyless Chuck
     
    McMaster-Carr Approved
    1/32" to 1/2"
    1 mm to 13 mm
    10,0000.0016"Hardened SteelHardened Steel3 1/4"1.89"ClockwiseWrench FlatsSpanner WrenchAccuracy Certificate9790N110000000
    1/8" to 5/8"
    3 mm to 16 mm
    8,0000.0016"Hardened SteelHardened Steel3 7/16"2.13"ClockwiseWrench FlatsSpanner WrenchAccuracy Certificate9790N12000000
     
    Albrecht
    1/32" to 1/2"
    1 mm to 13 mm
    7,0000.0019"Hardened SteelHardened Steel3 5/16"2"ClockwiseCP130-R830075A48000000
    1/8" to 5/8"
    3 mm to 16 mm
    4,0000.002"Hardened SteelHardened Steel3 7/16"2.25"ClockwiseCP160-R830075A58000000
     
    Keyed Chuck
     
    McMaster-Carr Approved
    1/32" to 1/2"
    1 mm to 13 mm
    8,0000.0008"Hardened SteelHardened Steel3 3/8"2.13"Clockwise, CounterclockwiseKeyAccuracy Certificate9790N13000000
    1/8" to 5/8"
    3 mm to 16 mm
    8,0000.0008"Hardened SteelHardened Steel3 1/2"2.25"Clockwise, CounterclockwiseKeyAccuracy Certificate9790N14000000
     
    Drill Chuck Replacement Parts
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