Two-point internal micrometer for bore measurement – Acro Enterprise.

two points/three points internal micrometers

Two Points/Three Points Internal Micrometers – Accurate Internal Diameter Measuring Tools

Two points/three points internal micrometers are precision instruments used to measure the internal diameters of holes, bores, tubes, and cylinders with high accuracy. These tools are essential in quality control and machining environments where dimensional precision is critical.

Made from hardened stainless steel and equipped with carbide-tipped measuring faces, two points/three points internal micrometers deliver consistent, repeatable results in demanding inspection applications.

 Key Features

Two or Three Contact Points

For flexible and accurate internal measurement.

Carbide Measuring Faces

Wear-resistant and precise for long-term use.

Self-Centering (3-Point)

Reduces operator error and ensures alignment.

Digital & Mechanical Options

Available for different preferences and applications.

Applications of Two Points / Three Points Internal Micrometers

  •  Precision Machining: Measuring bore diameters in engine blocks, gears, and mechanical parts
  • Quality Assurance Labs: Verifying internal dimensions for tolerance control
  •  Automotive Industry: Inspecting cylinders, valve guides, and connecting rods
  •  Tool Rooms & Workshops: Setting and checking bore sizes during part manufacturing
  •  Aerospace Sector: High-precision bore measurement in complex components

 How to Use Two Points / Three Points Internal Micrometers

  1. Choose the Proper Size Range: Use the correct micrometer size or extension rod for the bore.
  2. Zero Calibration: Calibrate with a ring gauge or master setting ring.
  3. Insert the Micrometer: Gently position the micrometer inside the bore for accurate alignment.
  4. Take the Reading: Rotate the thimble to gently expand the measuring points until they contact the bore wall.
  5. Record the Measurement: Use the micrometer scale (or digital readout) to read the internal diameter.
  6. Store Safely: Clean and place the micrometer in its case after use.

Technical Specifications

Feature Details
Measurement Range 6 mm to 300 mm (custom options available)
Resolution 0.01 mm / 0.001 mm (digital versions)
Contact Points 2-point or 3-point (carbide-tipped)
Material Hardened Stainless Steel
Scale Type Mechanical or Digital
Calibration Supplied with setting rings or calibration certificate
Case Protective ABS or wooden storage box

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