Mitutoyo 145-218 | Caliper Jaw Inside Micrometer | 225 to 250 mm, 0.01 mm
Part No. 145-218 | Range 225–250 mm | Graduation 0.01 mm | Accuracy ±11 µm
Product Overview
The Mitutoyo 145-218 Series 145 caliper jaw inside micrometer is designed for direct measurement of large internal dimensions from 225–250 mm. Its caliper-type jaws can be positioned inside bores, internal grooves, recesses and slots that are difficult to measure with standard outside micrometers.
The measuring jaws are made from high-grade tool steel with carbide-tipped measuring faces for durable contact with the measured feature. A locking clamp secures the spindle after the measurement, making it easier to withdraw the micrometer from deep or awkward locations without disturbing the setting.
The satin chrome thimble and sleeve provide a clear mechanical scale with 0.01 mm graduation. As a fully mechanical analog instrument, the 145-218 requires no battery or electronic display.
For accurate inside measurement, the micrometer should be set against a reference of known size before use. A suitable setting ring or inside setting standard is required and is available separately.
Key Benefits
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Measures internal features across the 225–250 mm range.
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Provides ±11 µm accuracy with 0.01 mm graduation.
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Caliper-type jaws provide access to large bores, grooves and recesses.
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Carbide-tipped measuring faces provide durable measuring contact.
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High-grade tool-steel construction supports regular workshop use.
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Spindle locking clamp helps retain the measured setting during withdrawal.
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Satin chrome thimble and sleeve provide readable mechanical graduations.
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Fully mechanical operation requires no batteries.
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Supplied with a protective case.
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A setting ring or suitable inside reference standard can be specified separately.
Who This Product Is Best For
The Mitutoyo 145-218 is suited to machine shops, pump and hydraulic repair workshops, valve manufacturing, maintenance departments and dimensional inspection applications in Kuwait.
It is useful for machinists checking large internal features, quality-control personnel verifying first-off or finished components, and maintenance teams measuring bores and internal features on pumps, gearboxes, flanges and other large fabricated or machined components.
For measurements above the 225–250 mm range, the adjacent Series 145 size, Mitutoyo 145-219, covers 250–275 mm.
How to Use
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Set the micrometer against a setting ring or suitable inside standard of known dimension and adjust it correctly.
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Retract the jaws slightly below the expected feature size and position them inside the bore or groove.
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Expand the jaws gently until both measuring faces contact the internal surfaces.
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Rock the micrometer slightly to locate the correct maximum reading across the feature.
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Use the spindle locking clamp to retain the measurement if required, then withdraw the instrument and read the thimble and sleeve.
Frequently Asked Questions
What is the Mitutoyo 145-218 used for?
The 145-218 is an inside micrometer for measuring large internal dimensions such as bore diameters, internal grooves, recesses and slot widths from 225–250 mm.
How accurate is the Mitutoyo 145-218?
The specified accuracy is ±11 µm, with a graduation of 0.01 mm.
Does the Mitutoyo 145-218 require a setting ring?
Yes. An inside micrometer should be checked and set against a known reference before measurement. A suitable setting ring or inside setting standard is available separately.
What type of measuring faces does the 145-218 have?
The micrometer uses carbide-tipped measuring faces on caliper-type jaws.
Is the Mitutoyo 145-218 digital or mechanical?
It is an analog, fully mechanical micrometer and does not require batteries.
What is the difference between the Mitutoyo 145-218 and 145-219?
The 145-218 covers 225–250 mm, while the 145-219 covers the adjacent 250–275 mm range.
How can I buy the Mitutoyo 145-218 in Kuwait?
Call Al Belad General Tech Services on +965 9807 4888 or email mathews@generaltechkuwait.com for pricing and availability.
