Mitutoyo 145-194 Caliper Jaw Inside Micrometer 1-2"
Part No. 145-194 | Range 1–2" | Graduation .001" | Accuracy ±.0003"
Product Overview
The Mitutoyo 145-194 Series 145 caliper jaw inside micrometer measures bore diameters, internal grooves and slot widths across the 1–2" range. It provides ±.0003" accuracy with .001" graduation and uses carbide-tipped measuring faces for repeated internal dimensional inspection.
Unlike telescoping gauges, which require a separate measuring instrument after the gauge is positioned, the 145-194 combines caliper-type jaws with a mechanical micrometer readout. The measuring jaws can be positioned directly inside a bore, groove or recess, allowing the dimension to be read from the thimble and sleeve.
The caliper-type jaws are made from high-grade tool steel with carbide measuring faces. The carbide faces provide wear resistance for repeated measurements, while the satin chrome finish on the thimble and sleeve helps maintain clear scale visibility under workshop lighting.
A spindle locking clamp allows the measured position to be secured before withdrawing the micrometer from a deep or difficult-to-access feature. Because the 145-194 is fully mechanical, it requires no battery and can be used without an electronic display or data connection.
As with other inside micrometers, the instrument should be referenced against a known standard before measurement. A suitable setting ring or inside setting standard is required and is sold separately. Contact General Tech Services if you would like the appropriate setting accessory quoted with the micrometer.
For smaller internal features, see the Mitutoyo 145-193 covering the .2–1.2" range.
Key Benefits
-
Internal feature measurement: Caliper-type jaws reach into bores, grooves and slots across 1–2".
-
Fine mechanical measurement: .001" graduation supports detailed dimensional inspection.
-
Stated accuracy: ±.0003" according to the supplied Mitutoyo Series 145 catalogue data.
-
Carbide measuring faces: Carbide-tipped faces provide wear resistance for repeated measurements.
-
Clear scale: Satin chrome thimble and sleeve help provide readable mechanical measurements.
-
No battery required: Fully mechanical operation requires no battery or electronic display.
-
Secure readings: A spindle locking clamp holds the measured position while the tool is withdrawn.
-
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 145-194 is suited to machine shops, hydraulic and pump repair workshops, valve manufacturers, maintenance teams and quality-control departments working with internal features in the 1–2" range.
It can be used for first-off inspection, in-process dimensional checks and verification of finished or worn components. Its mechanical design is useful where a battery-free measuring instrument is preferred.
Typical applications include small bearing housings, gear bores, valve bodies, hydraulic fittings, turned components, internal grooves and other internal features that are difficult to measure with conventional outside micrometers.
How to Use
-
Set the micrometer against a setting ring or inside standard of known size and adjust the instrument to the reference dimension.
-
Close the jaws slightly below the expected feature size and insert them squarely into the bore, groove or slot.
-
Open the jaws gently until both measuring faces contact the internal surfaces.
-
Rock the micrometer slightly where appropriate to locate the correct maximum reading.
-
Lock the spindle using the clamp if the measurement needs to be retained while withdrawing the tool.
-
Read the measurement from the thimble and sleeve.
Use an appropriate setting standard and follow the applicable Mitutoyo operating and inspection procedures.
Frequently Asked Questions
What is the Mitutoyo 145-194 used for?
The 145-194 is a mechanical caliper jaw inside micrometer for measuring bore diameters, internal grooves and slot widths from 1–2". It is designed for internal features that conventional outside micrometers cannot directly reach.
How accurate is the Mitutoyo 145-194?
The stated accuracy is ±.0003", with .001" graduation, based on the supplied Mitutoyo Series 145 catalogue data.
Does the 145-194 require a setting ring?
Yes. The micrometer should be referenced against a known standard before measurement. A suitable setting ring or inside setting standard is sold separately.
Which Series 145 size should I choose?
Select the model whose measuring range brackets the internal feature you need to measure. The 145-194 covers 1–2", while the Mitutoyo 145-193 covers .2–1.2".
Is there a digital version of the 145-194?
The Mitutoyo 345-351-30 is a Digimatic caliper-type inside micrometer covering the 1–2" range, with a digital LCD display, .00005" / 0.001 mm resolution and SPC data output. The 145-194 is the mechanical analog option.
Does the Mitutoyo 145-194 need batteries?
No. The 145-194 is a fully mechanical analog inside micrometer and does not require a battery or electronic display.
Does the 145-194 have carbide measuring faces?
Yes. The supplied specification identifies carbide-tipped measuring faces on the caliper-type jaws.
How do I buy the Mitutoyo 145-194 in Saudi Arabia?
Call General Tech Services at +966 53 132 1586 or email mathews@generaltechsaudi.com for pricing and delivery availability.
