Mitutoyo 145-189 Caliper Jaw Inside Micrometer 100-125mm
Part No. 145-189 | Range 100–125 mm | Graduation 0.01 mm | Accuracy ±9 µm
Product Overview
The Mitutoyo 145-189 is a caliper jaw inside micrometer for measuring internal dimensions across a 100–125 mm range. Its caliper-type jaws are designed to reach into bores, internal grooves, recesses and slot widths that can be difficult to measure with standard outside micrometers.
The jaws are made from high-grade tool steel with carbide-tipped measuring faces. A spindle locking clamp helps secure the measured position before the tool is withdrawn from a deep or awkward feature. The satin chrome thimble and sleeve provide an easy-to-read mechanical scale with 0.01 mm graduation.
The 145-189 is fully mechanical and requires no batteries. For accurate inside measurement, the micrometer should be set against a known reference before use. A setting ring or inside setting standard is required and is available separately.
For the next Series 145 range, see the Mitutoyo 145-190 covering 125–150 mm.
Key Benefits
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Reaches internal features across the 100–125 mm measurement range.
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±9 µm accuracy with 0.01 mm graduation.
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Carbide-tipped measuring faces for durable contact with the measured feature.
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Caliper-type jaws suitable for bores, grooves, recesses and slots.
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Spindle locking clamp helps retain the measured setting during withdrawal.
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Satin chrome thimble and sleeve provide clear mechanical reading.
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Fully mechanical operation requires no batteries.
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Supplied in a protective case for storage and transport.
Who This Product Is Best For
The Mitutoyo 145-189 is suited to machine shops, maintenance workshops, pump and hydraulic service operations, valve manufacturing and dimensional inspection environments in Kuwait.
It can be used by machinists checking internal dimensions during production, inspectors verifying first-off or finished components, and maintenance personnel measuring internal features on equipment and replacement parts within the 100–125 mm range.
How to Use
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Set the micrometer against a setting ring or inside standard of known size and adjust it to the reference.
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Position the jaws slightly below the expected feature size and insert them into the bore, groove or internal feature.
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Open the jaws gradually until both measuring faces contact the feature. Rock the micrometer slightly to locate the correct maximum reading.
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Lock the spindle using the locking clamp, withdraw the micrometer if required, and read the thimble and sleeve.
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Compare the measurement with the applicable dimensional tolerance for the component.
Frequently Asked Questions
What is the Mitutoyo 145-189 used for?
The 145-189 is used to measure internal dimensions across 100–125 mm, including bore diameters, internal grooves, recesses and slot widths.
How accurate is the Mitutoyo 145-189?
The 145-189 has a stated accuracy of ±9 µm and a 0.01 mm graduation.
Does the 145-189 require a setting ring?
Yes. An inside micrometer should be set against a known reference before measurement. A suitable setting ring or inside setting standard is required and is available separately.
What is the measurement range of the 145-189?
The Mitutoyo 145-189 covers 100–125 mm. The adjacent 145-190 covers the next range of 125–150 mm.
Is the Mitutoyo 145-189 digital?
No. It is an analog, fully mechanical inside micrometer and does not require batteries.
What are the measuring faces made from?
The measuring faces are carbide tipped, while the caliper-type jaws are made from high-grade tool steel.
How much does the 145-189 weigh?
The main unit mass is 210 g based on the supplied product data.
How can I buy the Mitutoyo 145-189 in Kuwait?
Call Al Belad General Tech Services on +965 9807 4888 or email mathews@generaltechkuwait.com for pricing and delivery information.
