Mitutoyo 511-855 | Micrometer Head Bore Gauge | 6.0-10.0", .0001"
Part No. 511-855 | Range 6–10" (152.4–254 mm) | Graduation 0.0001" | Accuracy 0.00008" (2 µm)
Product Overview
The Mitutoyo 511-855 Series 511 micrometer head bore gauge is designed for measuring internal diameters from 6–10" (152.4–254 mm). Its built-in micrometer head provides 0.5" of adjustment, allowing the gauge to be set across a broad measuring range with fewer interchangeable components.
The gauge features a 0.0001" graduation dial indicator and provides 0.00008" (2 µm) wide-range accuracy. Mitutoyo catalogue data also specifies 0.5 µm repeatability and 1 µm adjacent error. Supplied 0.4", 0.8", 0.8" and 2" sub-anvils help configure the gauge for different bore sizes.
The carbide ball contact point is designed for repeated dimensional measurement, while the 3/8" gauge stem provides a practical configuration for workshop and inspection use. The instrument is supplied in a fitted case.
The 511-855 is suitable for measuring engine blocks, compressor and pump casings, gearbox housings, hydraulic cylinders and other large-bore components used in machining, maintenance and heavy engineering applications.
For smaller bore sizes, the Mitutoyo 511-854 covers the 4–6.4" range.
Key Benefits
Fast size adjustment: the built-in 0.5" micrometer head allows the gauge to be adjusted across its travel without relying on numerous anvil combinations.
Fine dial reading: the 0.0001" graduation provides detailed readings for large-bore dimensional inspection.
Specified accuracy: wide-range accuracy is 0.00008" (2 µm), with 0.5 µm repeatability and 1 µm adjacent error according to Mitutoyo catalogue data.
Extended configuration: supplied 0.4", 0.8", 0.8" and 2" sub-anvils help configure the gauge for different measuring sizes.
Durable contact point: the carbide ball contact point is suitable for repeated contact during dimensional inspection.
Practical storage: the gauge is supplied in a fitted case for storage and transport between inspection areas.
Who This Product Is Best For
The Mitutoyo 511-855 is suited to heavy engineering workshops, machining operations, engine and compressor overhaul teams, maintenance departments and dimensional inspection environments in Saudi Arabia.
It can be used by quality inspectors checking first-off components, machinists verifying bore dimensions between operations and maintenance engineers checking internal wear before or after equipment refurbishment.
Its 6–10" measuring range makes it suitable for large components where internal-diameter measurement is required across a relatively wide range.
How to Use / How It Works
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Select the appropriate sub-anvil and measuring configuration for the required bore size.
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Set the built-in micrometer head to the nominal measurement.
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Zero the gauge using a suitable setting ring or an appropriate reference standard set to the nominal size.
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Insert the gauge carefully into the bore without forcing the contact point against the workpiece.
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Rock the gauge gently through the measuring position and identify the minimum dial reading.
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Record the deviation from the reference or nominal dimension.
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Repeat measurements at different depths and angular positions when checking for taper, ovality or other bore-form variations.
For critical inspection work, use a suitable calibrated reference and follow the applicable measurement and calibration procedures for the instrument.
Frequently Asked Questions
What is the Mitutoyo 511-855 used for?
The Mitutoyo 511-855 is a Series 511 micrometer head bore gauge for measuring internal diameters from 6–10" (152.4–254 mm). It is suitable for large-bore dimensional inspection.
What is the accuracy of the Mitutoyo 511-855?
The specified wide-range accuracy is 0.00008" (2 µm). Mitutoyo catalogue data also specifies 0.5 µm repeatability and 1 µm adjacent error.
What is the graduation of the 511-855 dial indicator?
The dial indicator has a 0.0001" graduation.
How much travel does the micrometer head have?
The built-in micrometer head provides 0.5" of travel.
What sub-anvils are supplied with the 511-855?
The supplied sub-anvils are 0.4", 0.8", 0.8" and 2".
What is the measuring range of the 511-855?
The catalogue specification for the 511-855 is 6–10" (152.4–254 mm).
Which model should I choose for a smaller bore?
The Mitutoyo 511-854 covers the 4–6.4" range, while the 511-855 covers 6–10". Select the model whose measuring range brackets the required bore size.
How do I buy the Mitutoyo 511-855 in Saudi Arabia?
Contact General Tech Services in Dammam, Saudi Arabia, at +966 569 289 544 or mathews@generaltechsaudi.com for current pricing and availability.
