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Starrett T444.1XRL-3 outside micrometer, 2 to 3 inch range, carbide anvils, ratchet thimble, vernier scale, in case

Starrett

Starrett T444.1XRL-3 Outside Micrometer 2-3 in

SKU CH-W7FE-02CYF

Mechanical outside micrometer measuring 2 in to 3 in with .0001 in resolution and carbide anvils in a case

  • Measures 2 in to 3 in with .0001 in resolution
  • Vernier display reads directly to .0001 in
  • Ratchet thimble gives consistent measuring force
  • Carbide anvil and spindle resist wear
  • Includes fitted case and adjustable wrench

Precision Mechanical Micrometer

The Starrett T444.1XRL-3 is a mechanical outside micrometer designed for machinists and quality inspectors who require reliable dimensional verification. It covers a measurement range of 2 in to 3 in with a vernier resolution of .0001 in and an accuracy of +/- .0001 in. The instrument features carbide measuring faces on both the anvil and the .25 in diameter spindle for wear resistance.

Passive Operation Characteristics

As a fully mechanical tool, the micrometer draws no electrical power and generates no audible noise or measurable heat during use. The ratchet thimble provides consistent measuring force through tactile feedback alone. Thermal stability depends on the ambient environment and the operator's handling technique rather than active cooling.

Workshop Integration Requirements

The micrometer includes a fitted case and an adjustable wrench for spindle lock adjustments, allowing immediate deployment at an inspection station or machine tool. Its mechanical vernier display eliminates the need for batteries or calibration electronics. The 2 in to 3 in capacity addresses a specific range bracket, so users measuring outside this interval will require additional instruments.

Highlights

  • Measures 2 in to 3 in with .0001 in resolution
  • Vernier display reads directly to .0001 in
  • Ratchet thimble gives consistent measuring force
  • Carbide anvil and spindle resist wear
  • Includes fitted case and adjustable wrench

Specifications

BrandSTARRETT

Questions about this item

How do I fit the Starrett T444.1XRL-3 onto a workpiece and which step is often missed?

Open the carbide anvil and spindle past 2 in, place the part between the flat faces, turn the ratchet thimble until it clicks, then engage the ring lock nut — many users forget to lock the spindle before reading.

What part of this micrometer will need replacement or routine maintenance?

The 0.25 in carbide spindle and anvil faces resist wear, but the vernier scale and ratchet mechanism should be checked periodically for dirt or damage that could affect the 0.0001 in resolution.

At what point does measurement drift appear during repeated use of the 2 in to 3 in range?

The stated accuracy is ±0.0001 in across the full range; drift typically shows first when the spindle threads or ratchet wear introduce backlash beyond that tolerance.

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