Micrometers

Three-Point Internal Micrometer 50-300mm – Self-Centering Bore Gauge with Carbide Tips & Calibration Ring

  • Over 100mm/4″:setting rings opitional
  • Over 100mm/4″:measuring heads are ratchet stop
  • Features carbide measuring faces, ratchet thimble, aluminum body.
  • Includes calibration rings up to 100mm. Accuracy to 0.005mm.

Product Description:

Three-Point Internal Micrometer 50-300mm – Precision Bore Measurement Solution

Experience exceptional accuracy in large internal diameter measurements with our professional three-point internal micrometer. Designed for both blind and through holes from 50-300mm, this micrometer features a self-centering mechanism that ensures perfect alignment and reliable measurements. The carbide-tipped measuring contacts provide excellent wear resistance, while the lightweight aluminum body offers perfect balance between durability and user comfort. With included calibration rings for models up to 100mm and ratchet thimble for consistent measuring force, this tool is ideal for precision machining, quality control, and manufacturing applications requiring large bore measurements.

 Technical Specifications:

Order NumberMeasuring RangeAccuracySetting RingL1 DimensionExtension Rod
H-315-10-27050-63mm0.005mmΦ62mm114mm150mm
H-315-11-27062-75mm0.005mmΦ62mm114mm150mm
H-315-12-27075-88mm0.005mmΦ87mm114mm150mm
H-315-13-27087-100mm0.005mmΦ87mm114mm150mm
H-315-61-070100-125mm0.005mmΦ100mm145mm150mm
H-315-62-070125-150mm0.005mmΦ150mm145mm150mm
H-315-63-070150-175mm0.005mmΦ150mm145mm150mm
H-315-64-070175-200mm0.005mmΦ200mm145mm150mm
H-315-65-070200-225mm0.007mmΦ200mm145mm150mm
H-315-66-070225-250mm0.007mmΦ250mm145mm150mm
H-315-67-070250-275mm0.007mmΦ250mm145mm150mm
H-315-68-070275-300mm0.007mmΦ275mm145mm150mm

Key Features:

  • Carbide-tipped measuring faces for exceptional wear resistance

  • Ratchet thimble mechanism for consistent measuring force

  • Lightweight aluminum body for reduced operator fatigue

  • Self-centering three-point design for automatic alignment

  • Calibration rings included for models up to 100mm (optional for larger sizes)

  • Suitable for both blind and through hole measurements

 Professional Features:

  • Precision Engineering: Maintains accuracy up to 0.005mm across most measurement ranges

  • Extended Range Capability: Covers large internal diameters from 50mm to 300mm

  • Thermal Stability: Aluminum construction minimizes heat transfer during handling

  • User-Friendly Design: Ergonomic handling and clear reading scale

  • Interchangeable Components: Standard extension rods for flexible configuration

  • Professional Grade: Designed for industrial workshop environments

 Applications:

  • Large bore machining and inspection

  • Automotive engine cylinder measurement

  • Hydraulic cylinder manufacturing

  • Industrial pipe and tubing inspection

  • Aerospace component measurement

  • Heavy equipment manufacturing

  • Quality control and precision metrology

 Additional Information:

Calibration Note:

  • Calibration rings included standard for measurements up to 100mm

  • Optional calibration rings available for measurements above 100mm

Technical Specifications:

  • All models feature carbide measuring faces for extended durability

  • Lightweight aluminum construction reduces operator fatigue

  • Ratchet mechanism ensures consistent measuring force

  • Designed for both blind and through hole applications