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    5 Products

    Starrett Micrometer Heads

    Mount these micrometer heads in jigs, fixtures, machine tools, movable tables, and other equipment that require precise adjustments. They are held in place by the cylindrical mounting hub using your existing brackets or fixtures. Spindle length is the maximum extended distance when the micrometer head is set at zero.
    Ratchet-Stop Thimble—Ratchet-stop thimbles have a constant-force mechanism to ensure repeatable measurements without relying on operator feel. They also have a speeder knob to reduce the time it takes to move the spindle. Once the spindle contacts the surface of the measured object, it will stop tightening, but the speeder knob will continue turning with a clicking sound.
    Plain Thimble—Plain thimbles turn freely without friction or a stopping device and rely on operator feel for accurate measurements.
    Nonrotating Spindle—Nonrotating spindles prevent scratches on delicate work surfaces and eliminate distortion of soft or elastic material.
    Locknut—Locknuts lock the micrometer’s spindle in place.
    Spindle
    Mounting
    Hub
    Distance Measured
    Range
    Accuracy
    Measuring
    Increments
    Tip
    Shape
    Dia.
    Lg.
    Face
    Material
    Overall
    Lg.
    Lg.
    Dia.
    Features
    Mfr.
    Mfr. Model
    No.
    Each
    Plain Thimble—Rotating Spindle
    Image of Product. Front orientation. Micrometer Heads. Starrett Micrometer Heads, Plain Thimble.
    0 mm to 13 mm-0.002 mm to 0.002 mm0.01 mmFlat0.138"0.625"Steel2"0.234"0.236"Starrett460MB8578A160000000
     
    Plain Thimble—Nonrotating Spindle
    Image of Product. Front orientation. Micrometer Heads. Starrett Micrometer Heads, Plain Thimble.
    0" to 0.5"-0.0001" to 0.0001"0.001"Flat0.200"0.75"Steel3 7/16"0.375"0.375"LocknutStarrett261L8578A11000000
     
    Ratchet-Stop Thimble—Nonrotating Spindle
    Image of Product. Front orientation. Micrometer Heads. Starrett Micrometer Heads, Ratchet-Stop Thimble.
    0" to 1"-0.0001" to 0.0001"0.001"Flat0.235"1.25"Steel5 1/2"0.75"0.500"LocknutStarrett262RL8578A12000000
     
    Ratchet-Stop Thimble—Rotating Spindle
    Image of Product. Front orientation. Micrometer Heads. Starrett Micrometer Heads, Ratchet-Stop Thimble.
    0" to 1"-0.00005" to 0.00005"0.0001"Flat0.234"1.25"Carbide4 63/64"0.75"0.500"LocknutStarrettT263XRL8578A71000000
    0 mm to 13 mm-0.00125 mm to 0.00125 mm0.002 mmFlat0.203"0.75"Carbide3 25/64"0.5"0.375"LocknutStarrettV463MXRL8578A73000000
     
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