Mitutoyo 345-350-30 Digital Inside Microm. Caliper Type Inch/Metric, 0,2-1,2"

Part No. 345-350-30 | Range .2–1.2" (5.1–30.5 mm) | Resolution .00005" / 0.001 mm | Accuracy ±.00025"

Product Overview

The Mitutoyo 345-350-30 Digimatic caliper-type inside micrometer measures bore diameters, internal grooves and slots across .2–1.2" (5.1–30.5 mm) with a clear digital readout. It provides ±.00025" accuracy with .00005" / 0.001 mm resolution, carbide-tipped measuring faces and SPC data output for digital inspection records.

Unlike telescoping gauges, which require a separate measuring instrument after the gauge is positioned, the 345-350-30 combines caliper-type measuring jaws with a digital micrometer readout. This allows the measured value to be read directly from the LCD while the carbide measuring faces contact the internal feature.

The caliper-type jaws are manufactured from high-grade tool steel with carbide-tipped measuring faces for wear resistance during repeated inspection. A spindle locking clamp allows the measured position to be secured before withdrawing the tool from a bore or other difficult-to-access feature.

The Digimatic display provides direct readings in inch or millimetres, with functions including origin setting, zero/ABS, data hold, data output and function lock. SPC data output can transfer measurements to a compatible PC or data logger, supporting digital inspection and reducing manual transcription.

A setting ring or inside setting standard is required to establish the reference before measurement and is sold separately. Ask General Tech Services to quote the appropriate setting standard with the micrometer.

For larger internal features, see the Mitutoyo 345-351-30 covering the 1–2" range.

Key Benefits

• Direct internal measurement: Caliper-type jaws measure bores, internal grooves and slots directly.

• Fine resolution: .00005" / 0.001 mm resolution supports detailed dimensional inspection.

• Documented accuracy: ±.00025" accuracy according to the supplied Mitutoyo Series 345 data.

• Carbide measuring faces: Carbide-tipped faces provide wear resistance for repeated measurements.

• Digital readout: Digimatic LCD provides a clear numerical measurement and supports inch/mm conversion.

• Secure measurement: A spindle locking clamp holds the measured position while the tool is withdrawn.

• Inspection data output: SPC Digimatic data output supports transfer to a PC or data logger.

• Compact range: Covers .2–1.2" (5.1–30.5 mm) for small and medium internal features.

• Protective storage: Supplied in a protective case.

For pricing and delivery availability, call +966 53 132 1586.

Who This Product Is Best For

The Mitutoyo 345-350-30 is suited to quality-control departments, CNC machine shops, valve and fitting manufacturers, maintenance teams and dimensional inspection operations working with internal features in the .2–1.2" range.

It can be used for first-off inspection, in-process dimensional checks and verification of finished components. The SPC output is particularly useful where measurements need to be transferred into digital inspection records rather than copied manually.

Typical applications include bore diameters, bushing IDs, internal grooves, slot widths and other internal features that are difficult to measure with conventional outside micrometers.

How to Use

1. Set the micrometer against a setting ring or inside standard of known size and establish the reference using the ORIGIN function.

2. Retract the jaws slightly below the expected feature size and insert them squarely into the bore, groove or slot.

3. Open the measuring jaws gently until both carbide faces contact the internal surfaces.

4. Rock the micrometer slightly to locate the correct maximum reading where appropriate.

5. Lock the spindle using the clamp if the measurement needs to be retained while withdrawing the instrument.

6. Read the value on the LCD or transfer the measurement through the Digimatic SPC output.

Always use an appropriate setting standard and follow the applicable Mitutoyo operating and inspection procedures.

Frequently Asked Questions

What is the Mitutoyo 345-350-30 used for?

The 345-350-30 is a Digimatic caliper-type inside micrometer for measuring bore diameters, internal grooves, slots and similar internal features from .2–1.2" (5.1–30.5 mm).

How accurate is the Mitutoyo 345-350-30?

The stated accuracy is ±.00025", with .00005" / 0.001 mm resolution based on the supplied Mitutoyo Series 345 catalogue data.

Does the 345-350-30 require a setting ring?

Yes. An inside micrometer should be referenced against a known standard before measurement. A suitable setting ring or inside setting standard is sold separately.

What is the difference between the 345-350-30 and 345-351-30?

The 345-350-30 covers .2–1.2" (5.1–30.5 mm), while the 345-351-30 covers 1–2" (25.4–50.8 mm). Select the model whose range brackets the internal feature being measured.

Is there an analog alternative to the 345-350-30?

Yes. The Mitutoyo 145-193 is an analog inside micrometer covering the same general .2–1.2" range. The 345-350-30 adds a Digimatic digital display and SPC data output.

Does the 345-350-30 support SPC data output?

Yes. It provides Digimatic SPC data output for transferring measurement data to compatible equipment such as a PC or data logger.

How do I buy the Mitutoyo 345-350-30 in Saudi Arabia?

Call General Tech Services at +966 53 132 1586 or email mathews@generaltechsaudi.com for pricing and delivery availability.