Mitutoyo 511-845, Micrometer Head Bore Gauge, Range 6.0 - 10.0", Graduation .0005"
Part No. 511-845 | Range 6"–10" (152.4–254 mm) | Graduation 0.0005"
General Tech Services LLC — Genuine Mitutoyo Distributor, Kuwait +965 9807 4888
Product Overview
The Mitutoyo 511-845 micrometer head bore gauge measures large internal diameters from 6"–10" (152.4–254 mm). A micrometer head mounted on the anvil allows the measuring dimension to be set directly, reducing the need for a separate setting ring for every individual bore size.
The 511-845 features a longer plunger stroke while maintaining its precision. Its carbide contact point provides wear resistance, while the large sponge-structure grip reduces heat transfer from the operator's hand by 50%. Sub-anvils provide a wide measuring range, and optional extension rods support measurement of deeper holes.
An optional inside-length standard, such as a setting ring or Inside Micro Checker, can be used to confirm the setting before inspection.
Typical applications include compressor casings, large valve bodies, turbine housings and gearbox housings. The gauge is suited to QC inspectors, calibration laboratories, fabrication and machining workshops, and industrial maintenance teams serving Kuwait's oil, gas and utilities sectors.
Temperature control is important for precision bore inspection. Steel expands by approximately 11.5 μm per metre per °C. At 254 mm, a 10°C temperature difference can correspond to approximately 29.2 μm of dimensional change. Allow the Mitutoyo 511-845 and workpiece to reach the same temperature before taking a final reading.
Key Benefits
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Micrometer head setting — allows large dimensions to be set directly at the anvil
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Self-centring two-point measurement — helps align the gauge with the true bore diameter
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Carbide contact point — provides wear resistance for repeated inspection
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Heat-insulating sponge-structure grip — reduces heat transfer from the operator's hand by 50%
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Sub-anvils — provide a wide measuring range
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Deep-hole measurement — optional extension rods provide additional reach
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0.0005" graduation — supports detailed large-bore inspection
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Mitutoyo 511 series design — suited to repeatable industrial bore measurement
Who This Product Is Best For
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Machine shops checking compressor casings and large machined bores
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QC inspectors measuring bore size, taper and ovality
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Calibration laboratories requiring repeatable internal-diameter measurements
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Oil and gas maintenance workshops in Kuwait
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Fabrication and machining workshops
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Engine, pump and hydraulic rebuild workshops
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Industrial maintenance teams handling large internal diameters
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Buyers standardising on Mitutoyo 511-series bore gauges
How to Measure a Bore With This Gauge
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Select the appropriate anvil and sub-anvil combination for the nominal bore size.
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Set the required dimension using the micrometer head mounted on the anvil.
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Use a setting ring, master or optional Inside Micro Checker when an independent setting confirmation is required.
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Insert the gauge into the bore and gently rock it through the measuring position.
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Identify the turning point of the supplied 0.0005" indicator and record the deviation from the reference dimension.
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Repeat measurements at different depths and positions when checking for taper or ovality.
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Allow the gauge and workpiece to reach the same temperature before taking the final measurement.
Frequently Asked Questions
What range does the Mitutoyo 511-845 micrometer head bore gauge measure?
It measures internal diameters from 6"–10" (152.4–254 mm).
Is a dial indicator included?
Yes. The Mitutoyo 511-845 is supplied with a 0.0005" dial indicator.
Do I need a setting ring?
The micrometer head mounted on the anvil allows the size to be set directly. A setting ring or Inside Micro Checker is optional and can be used to confirm the setting.
Why does the grip matter?
Heat from the operator's hand can affect dimensional stability. The larger sponge-structure insulating grip reduces heat transfer from the hand by 50%.
Which model should I choose for a different bore size?
Select a model whose measuring range covers the required bore. The Mitutoyo 511-844 covers 4"–6.4", the 511-845 covers 6"–10", and the 511-846 covers 10"–16".
Can the Mitutoyo 511-845 be recalibrated?
Yes. Periodic recalibration through an ISO/IEC 17025-accredited calibration service can help maintain measurement traceability.
How should I store and care for the gauge?
Clean the measuring faces after use, store the instrument in its case away from direct sunlight and coolant, and avoid dropping it. Check the reference before each inspection and schedule periodic calibration as required.
How do I order the Mitutoyo 511-845 in Kuwait?
Pricing is quote-based. Call or WhatsApp +965 9807 4888 with the model number and required quantity for pricing and availability.
