Mitutoyo 511-856 | Micrometer Head Bore Gauge | 10.0-16.0", .0001"

Part No. 511-856 | Range 10–16" (254–406.4 mm) | Graduation 0.0001" | Accuracy 0.00008" (2 µm)

Product Overview

The Mitutoyo 511-856 Series 511 micrometer head bore gauge is designed for measuring large internal diameters from 10–16" (254–406.4 mm). Its built-in micrometer head provides 1" of adjustment, allowing the gauge to be set across a broad measuring range without relying on a large number of interchangeable anvils.

The gauge uses 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 1", 2" and 2" sub-anvils extend the measuring range, while the carbide ball contact point is suited to repeated dimensional inspection.

The 511-856 is suitable for large-bore inspection on engine blocks, compressor and pump casings, gearbox housings, hydraulic cylinders and other components used in heavy engineering, machining and maintenance applications.

For smaller bore sizes, the Mitutoyo 511-855 covers the 6–10" range.

Key Benefits

Fast size adjustment: the built-in 1" micrometer head allows the gauge to be adjusted to the required measuring size.

Fine dial reading: the 0.0001" graduation provides detailed readings for large-bore 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 measuring range: supplied 1", 2" and 2" sub-anvils help configure the gauge for different bore sizes.

Durable contact point: the carbide ball contact point is designed for repeated contact during dimensional inspection.

Practical handling: the 3/8" gauge stem and fitted case make the instrument suitable for workshop and inspection environments.

Who This Product Is Best For

The Mitutoyo 511-856 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 bore wear before or after equipment refurbishment.

The 10–16" measuring range makes it appropriate for large components where accurate internal-diameter measurement is required across a relatively wide bore range.

How to Use / How It Works

1. Configure the gauge with the appropriate sub-anvil and measuring arrangement for the required bore size.

2. Set the built-in micrometer head to the nominal measurement.

3. Zero the gauge using a suitable setting ring or an appropriate reference standard set to the nominal size.

4. Insert the gauge carefully into the bore without forcing the contact points against the workpiece.

5. Rock the gauge gently through the measuring position and identify the minimum dial reading.

6. Record the deviation from the reference or nominal dimension.

7. 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 511-856 used for?

The Mitutoyo 511-856 is a Series 511 micrometer head bore gauge for measuring internal diameters from 10–16" (254–406.4 mm). It is suitable for large-bore dimensional inspection.

What is the accuracy of the Mitutoyo 511-856?

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 511-856 dial indicator?

The dial indicator has a 0.0001" graduation.

How much travel does the micrometer head have?

The built-in micrometer head provides 1" of travel.

What sub-anvils are supplied with the 511-856?

The supplied sub-anvils are 1", 2" and 2".

What is the measuring range of the 511-856?

The catalogue specification for the 511-856 is 10–16" (254–406.4 mm).

What is the difference between the 511-856 and 511-846?

Both models cover the 10–16" measuring range. The 511-856 uses a 0.0001" dial graduation, while the 511-846 uses a 0.0005" dial graduation.

How do I buy the Mitutoyo 511-856 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.