Mitutoyo 145-220 Caliper Jaw Inside Micrometer 275-300mm

Part Number: Mitutoyo 145-220
Contact: +965 9807 4888 | Call or WhatsApp | Kuwait

The Mitutoyo 145-220 caliper jaw inside micrometer measures internal diameters, grooves and slot widths from 275–300 mm using caliper-style jaws with carbide faces. It is a battery-free, workshop-ready choice for measuring large internal features. Request a quote in under a minute by calling or WhatsApping +965 9807 4888.

Internal grooves, short bores and slots on large components can be difficult to reach with a tubular inside micrometer. The Mitutoyo 145-220 caliper jaw inside micrometer uses caliper-type jaws that enter the feature, allowing the measurement to be taken directly from the internal walls.

Carbide measuring faces resist wear from repeated contact, while the mechanical thimble provides a clear 0.01 mm graduation. Because it is fully mechanical, there are no batteries to replace or electronic components to depend on during remote-site work or maintenance shutdowns.

The 275–300 mm measuring range is suitable for large internal diameters, housing grooves, internal shoulders and wide slots on heavy components. It is useful for QC inspectors, calibration labs, fabrication workshops, machining facilities, and maintenance teams serving Kuwait's oil, gas and utilities sectors.

For best accuracy, set the micrometer against an appropriate setting standard before measurement. Keep the measuring faces clean and store the Mitutoyo 145-220 in its case between jobs. In hot Kuwait workshops, allow the part and micrometer to reach a similar temperature before taking a final reading. At 300 mm, a 10 °C temperature difference can cause a steel part to expand by roughly 34.5 μm.

Working on smaller sizes? See the Mitutoyo 145-219 for 250–275 mm.

Key Benefits

• 0.01 mm graduation — Clear mechanical reading for large internal dimensions

• No batteries — Always ready for workshop, maintenance and field use

• Mitutoyo build quality — Durable mechanical construction for precision measurement

• 25 mm measuring band — Covers 275–300 mm for large internal features

• Reaches internal features — Caliper jaws measure grooves, slots and large bores

• Carbide faces — Wear-resistant measuring surfaces for repeated daily use

• Mechanical operation — Reliable operation without electronic components

Part Number: Mitutoyo 145-220
Contact: +965 9807 4888 | Call or WhatsApp | Kuwait

Who This Product Is Best For

• Machinists measuring large internal diameters

• QC inspectors checking internal groove and slot widths

• Calibration teams measuring large internal features

• Maintenance teams requiring a battery-free inside micrometer

• Gearbox, pump and valve rebuild shops

• Fabrication and machining workshops handling large components

• Buyers comparing the Mitutoyo 145-220 with digital inside micrometers

How to Use

1. Check the micrometer reference using an appropriate setting standard of known size.

2. Clean the measuring faces before taking the measurement.

3. Insert the caliper jaws into the bore, groove, slot or other internal feature.

4. Rock the micrometer gently to locate the true maximum internal dimension.

5. Turn the thimble until the carbide measuring faces make proper contact with the internal walls.

6. Apply consistent measuring pressure and read the sleeve and thimble graduations.

7. Clean the measuring faces after use and store the instrument safely in its case.

FAQ

What range does the Mitutoyo 145-220 caliper jaw inside micrometer measure?
It measures internal features from 275–300 mm with a 0.01 mm graduation.

What is a caliper jaw inside micrometer used for?
It is designed to measure large internal diameters, groove widths, slot widths and other internal features where conventional tubular inside micrometers may be difficult to position.

What are the measuring faces made of?
The measuring faces are carbide, providing resistance to wear from repeated contact.

Does the Mitutoyo 145-220 require batteries?
No. It is a fully mechanical inside micrometer and does not require batteries or electronic power.

Do I need a setting standard?
A suitable setting standard is recommended for establishing an accurate reference before measurement.

Which model should I choose for a smaller internal diameter?
The Mitutoyo 145-219 covers the 250–275 mm range, while the 145-220 covers 275–300 mm.

Why is temperature important when measuring large components?
Large steel components can change dimension with temperature. At 300 mm, a 10 °C temperature difference can produce approximately 34.5 μm of expansion, so allowing the micrometer and workpiece to reach a similar temperature helps improve measurement consistency.

Can the Mitutoyo 145-220 be recalibrated?
Yes. The micrometer can be periodically calibrated through a suitable calibration service to maintain measurement accuracy and traceability.

How should I store and care for the Mitutoyo 145-220?
Wipe the carbide measuring faces clean after use, protect the instrument from coolant and contamination, avoid impacts or drops, and store it in its case when not in use.

How do I order the Mitutoyo 145-220 in Kuwait?
Pricing is quote-based. Provide the model number and required quantity when contacting the supplier.

Part Number: Mitutoyo 145-220
Contact: +965 9807 4888 | Call or WhatsApp | Kuwait