145-219 Caliper Jaw Inside Micrometer 250-275mm
Part No. 145-219 | Range 250–275 mm | Graduation 0.01 mm | Accuracy ±12 µm
Product Overview
The Mitutoyo 145-219 is a Series 145 caliper jaw inside micrometer designed for measuring large internal dimensions from 250 to 275 mm. Its caliper-type jaws allow direct measurement of internal diameters, grooves and other recessed features that can be difficult to measure with conventional outside micrometers.
The micrometer provides 0.01 mm graduation with a specified accuracy of ±12 µm. Its carbide-tipped measuring faces are designed for repeated contact with workpiece surfaces, while the high-grade tool-steel caliper jaws provide the rigid structure required for internal measurement.
A locking clamp allows the spindle position to be secured after the measuring faces are correctly positioned. This can be useful when measuring deep or awkward features where the tool needs to be withdrawn before the reading is recorded.
The satin-chrome thimble and sleeve provide the mechanical scale used to read the measurement. As an analog, fully mechanical instrument, the 145-219 requires no battery.
For accurate inside-micrometer measurements, the instrument should be checked and set against a suitable reference such as a setting ring or inside setting standard before use. The required setting standard is available separately.
For a smaller adjacent range, the Mitutoyo 145-218 covers 225–250 mm.
Key Benefits
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250–275 mm measuring range for large internal dimensions.
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0.01 mm graduation for direct mechanical measurement.
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±12 µm specified accuracy.
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Caliper-type jaws for internal diameters, grooves and recessed features.
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Carbide-tipped measuring faces for repeated measuring contact.
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High-grade tool-steel jaw construction.
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Locking clamp for securing the spindle position during measurement.
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Satin-chrome thimble and sleeve for mechanical reading.
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No batteries required.
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Suitable for use with a separate setting ring or inside setting standard.
Who This Product Is Best For
The Mitutoyo 145-219 is suitable for machine shops, hydraulic and pump repair workshops, valve manufacturers, maintenance departments and quality-control teams in Kuwait.
It is particularly useful for measuring large bores, internal grooves and similar features on pump housings, gearbox components, valves, flanges and fabricated parts.
The 250–275 mm range makes it appropriate when the internal feature falls within this specific measurement span. For a neighbouring smaller range, the 145-218 covers 225–250 mm.
How to Use
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Set the micrometer against a suitable setting ring or inside reference standard of known dimension.
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Adjust the instrument according to the required reference value.
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Position the jaws slightly below the expected internal dimension.
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Insert the jaws squarely into the bore, groove or internal feature.
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Open the jaws gradually until both measuring faces contact the feature.
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Rock the micrometer carefully to locate the correct measurement position and maximum reading where applicable.
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Secure the spindle with the locking clamp if the measurement needs to be held while withdrawing the instrument.
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Read the measurement from the thimble and sleeve and record the result according to the applicable inspection procedure.
Use an appropriate reference standard and measurement technique for the accuracy required by the application.
Frequently Asked Questions
What is the Mitutoyo 145-219 used for?
The 145-219 is an inside micrometer for measuring internal diameters, grooves and other recessed dimensions from 250 to 275 mm.
What is the measuring range of the Mitutoyo 145-219?
The measuring range is 250–275 mm.
How accurate is the Mitutoyo 145-219?
The supplied Mitutoyo Series 145 data specifies ±12 µm accuracy with 0.01 mm graduation.
Does the 145-219 have carbide measuring faces?
Yes. The supplied specification identifies the measuring faces as carbide tipped.
Does the Mitutoyo 145-219 require a setting ring?
A suitable setting ring or inside setting standard is required to establish and verify the reference dimension before measurement. The setting standard is sold separately.
Is the Mitutoyo 145-219 digital?
No. The 145-219 is an analog, fully mechanical inside micrometer with a 0.01 mm graduated thimble and sleeve.
What is the difference between the 145-219 and 145-218?
The 145-219 covers 250–275 mm, while the 145-218 covers 225–250 mm. Select the model according to the internal dimension being measured.
How do I buy the Mitutoyo 145-219 in Kuwait?
Call Al Belad General Tech Services at +965 9807 4888 or email mathews@generaltechkuwait.com to request current pricing and delivery information.
