Mitutoyo 511-847, Micrometer Head Bore Gauge, Range 16.0 - 24.0", Graduation .0005"
Part No. 511-847 | Range 16–24" (406.4–609.6 mm) | Graduation 0.0005" | Accuracy 0.00008" (2 µm)
Product Overview
The Mitutoyo 511-847 Series 511 micrometer head bore gauge is designed for measuring large internal diameters across the 16–24" (406.4–609.6 mm) range. Its built-in micrometer head provides 2" of travel for convenient size adjustment, reducing the need for frequent anvil changes when measuring large bores.
The gauge uses a 0.0005" graduation dial indicator and provides 0.00008" (2 µm) wide-range accuracy, with 0.5 µm repeatability and 1 µm adjacent error according to the supplied Series 511 specifications. A carbide ball contact point provides a durable measuring contact, while the supplied 2" and 4" sub-anvils help extend the measuring setup for larger dimensions.
The 511-847 is suitable for large-bore inspection in engine blocks, compressor and pump casings, gearbox housings, hydraulic cylinders and other heavy engineering applications. It is supplied in a fitted case for storage and transport.
For a smaller measuring range, the Mitutoyo 511-846 covers 10–16". The 511-857 is another 16–24" option with a finer 0.0001" dial graduation.
Key Benefits
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16–24" (406.4–609.6 mm) measuring range for large-bore applications.
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Built-in micrometer head with 2" travel for convenient size adjustment.
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0.0005" dial graduation for clear analogue readings.
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0.00008" (2 µm) wide-range accuracy with 0.5 µm repeatability.
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Carbide ball contact point for durable contact with the measured surface.
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Supplied 2" and 4" sub-anvils for flexible large-bore measurement.
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3/8" gauge stem and fitted case for practical workshop use.
Who This Product Is Best For
The Mitutoyo 511-847 is suited to heavy engineering workshops, machining operations, engine and compressor overhaul work, pump and gearbox maintenance, and dimensional inspection teams working with large components.
It can be used by quality inspectors checking first-off components, machinists verifying internal dimensions between operations, and maintenance engineers assessing bore wear before repair or rebuilding. Its 16–24" range makes it appropriate where conventional small-range bore gauges are not sufficient.
How to Use / How It Works
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Select the appropriate anvil or sub-anvil arrangement for the bore being measured and adjust the micrometer head toward the nominal size.
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Set or zero the gauge using a suitable setting ring or an outside micrometer adjusted to the required nominal dimension.
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Insert the bore gauge carefully into the bore without forcing the contact point against the surface.
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Rock the gauge gently through the measuring position to locate the minimum dial reading corresponding to the true diameter.
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Compare the reading with the nominal setting and repeat measurements at different depths and angular positions to evaluate bore size, taper and ovality.
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Clean the contact and measuring surfaces after use and return the gauge to its fitted case.
Frequently Asked Questions
What is the Mitutoyo 511-847 used for?
The 511-847 is a large-bore measuring instrument for checking internal diameters from 16–24" (406.4–609.6 mm). Its built-in micrometer head provides convenient size adjustment within its operating range.
How accurate is the Mitutoyo 511-847?
The supplied Series 511 specifications state 0.00008" (2 µm) wide-range accuracy, 0.5 µm repeatability and 1 µm adjacent error.
What is the graduation of the 511-847 dial indicator?
The 511-847 uses a 0.0005" dial graduation.
What is the micrometer head travel?
The built-in micrometer head provides 2" of travel for adjusting the measuring setup.
Which sub-anvils are supplied with the 511-847?
The supplied specification identifies 2" and 4" sub-anvils.
What is the difference between the 511-847 and 511-857?
Both models are specified for the 16–24" range. The 511-847 has a 0.0005" dial graduation, while the 511-857 is specified with a finer 0.0001" dial graduation.
Is the 511-847 suitable for smaller bores?
The 511-847 starts at 16". For bores below 16", select a Series 511 model whose measuring range covers the required diameter, such as the 511-846 for the 10–16" range.
How do I buy the Mitutoyo 511-847 in Saudi Arabia?
Contact General Tech Services on +966 569 289 544 or email mathews@generaltechsaudi.com for pricing and delivery information.
