Mitutoyo 511-843, Micrometer Head Bore Gauge, Range 2.4 - 4.0", Graduation .0005"
Part No. 511-843 | Mitutoyo Series 511
Product Description
The Mitutoyo 511-843 Micrometer Head Bore Gauge is designed for measuring inside diameters from 2.4–4" (60.96–101.6 mm). Its built-in micrometer head provides .4" of adjustment, allowing the gauge to be set for different bore sizes without relying on a large combination of interchangeable anvils.
The gauge uses a 2-point self-centering measuring system and includes a .0005" graduation dial indicator. Mitutoyo specifies .00008" (2 µm) wide-range accuracy, 0.5 µm repeatability and 1 µm adjacent error for the gauge head.
A carbide ball contact point provides a durable measuring interface, while the supplied .4" and .8" sub-anvils help extend the gauge's usable range. The ø3/8" gauge stem and fitted case make the 511-843 suitable for workshop and inspection environments.
Typical applications include engine blocks, compressor and pump casings, gearbox housings, hydraulic cylinders and other large-bore components requiring dimensional inspection.
For larger bores, see the Mitutoyo 511-844, which covers 4–6.4".
Key Benefits
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2.4–4" (60.96–101.6 mm) measuring range for large bore inspection
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Built-in .4" micrometer head for convenient size adjustment
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.00008" (2 µm) wide-range accuracy
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0.5 µm repeatability and 1 µm adjacent error
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.0005" graduation dial indicator included
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Carbide ball contact point for durable measuring contact
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.4" and .8" sub-anvils supplied for range adjustment
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2-point self-centering design for consistent bore measurement
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Fitted case supplied for storage and transport
Who This Product Is Best For
The Mitutoyo 511-843 is suitable for heavy engineering workshops, engine and compressor overhaul teams, pump and gearbox maintenance, CNC machining operations and quality-control departments.
It can be used by machinists checking bore dimensions between machining operations, inspectors verifying first-off or finished components, and maintenance teams evaluating internal wear before equipment refurbishment.
How to Use
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Select and fit the appropriate anvil, spacer or supplied sub-anvil for the nominal bore size.
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Adjust the built-in micrometer head to approximately the required dimension.
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Zero the gauge using a suitable setting ring or an outside micrometer set to the nominal size.
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Insert the gauge into the bore without forcing the measuring contacts.
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Gently rock the gauge through the measuring position and identify the minimum dial reading.
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Compare the reading with the nominal reference and record the deviation.
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Repeat measurements at different depths and angular positions when checking for taper or ovality.
Frequently Asked Questions
What is the Mitutoyo 511-843 used for?
The 511-843 is a micrometer head bore gauge for measuring inside diameters from 2.4–4" (60.96–101.6 mm). It is suitable for bore inspection and dimensional checks on machined components.
What is the accuracy of the 511-843?
The supplied specification gives .00008" (2 µm) wide-range accuracy, with 0.5 µm repeatability and 1 µm adjacent error.
What is the dial graduation?
The included dial indicator has a .0005" graduation.
How much micrometer head travel does it have?
The built-in micrometer head provides .4" of travel.
What sub-anvils are supplied with the 511-843?
The gauge is supplied with .4" and .8" sub-anvils for adjusting the measuring configuration.
Does the 511-843 measure taper and ovality?
Yes. After establishing the reference zero, take measurements at multiple depths and angular positions to identify changes in bore diameter that may indicate taper or ovality.
What is the difference between the 511-843 and 511-844?
The 511-843 covers 2.4–4" (60.96–101.6 mm), while the 511-844 covers the larger 4–6.4" range.
How do I buy the Mitutoyo 511-843 in Kuwait?
Call +965 9807 4888 or email mathews@generaltechkuwait.com to request pricing and delivery information.
