Mitutoyo 511-755 Dial Bore Gauge Range 6.5-10", Graduation .0001"
Part No. 511-755 | Range 6.5"–10" (165.1–254 mm) | Graduation 0.0001"
General Tech Services LLC — Genuine Mitutoyo Distributor, Kuwait +965 9807 4888
Product Overview
The Mitutoyo 511-755 dial bore gauge measures internal diameters from 6.5"–10" (165.1–254 mm) using a self-centring two-point head and a supplied 0.0001" dial indicator. Carbide contact points provide wear resistance, while the heat-insulating grip reduces heat transfer from the operator's hand by 50% for more stable readings during extended inspections.
The 511-755 is designed for checking bore size, taper and ovality. Its longer plunger stroke supports bore measurement, while interchangeable 0.5 mm washers provide fine step adjustment of the anvils. Optional extension rods can be used for deeper bores.
Before measurement, set the gauge against a setting ring or an optional Inside Micro Checker. Typical applications include compressor casings, large valve bodies, turbine housings and gearbox housings.
Temperature control is important during precision inspection. Steel expands by approximately 11.5 μm per metre per °C. For a 254 mm component, a 10°C temperature difference can correspond to roughly 29.2 μm of dimensional change. Allow the workpiece and gauge to reach the same temperature before taking a final reading.
Key Benefits
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Self-centring two-point head — helps align the gauge across the true bore diameter
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Carbide contact point — provides wear resistance for repeated inspection
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Heat-insulating grip — reduces heat transfer from the operator's hand by 50%
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Fine setting — interchangeable 0.5 mm washers allow small step adjustments
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Deep-hole measurement — optional extension rods support deeper bores
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0.0001" graduation — suitable for detailed internal-diameter inspection
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Mitutoyo 511 series design — suited to repeatable bore measurement applications
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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Maintenance teams inspecting industrial equipment and rotating machinery
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Engine, pump and hydraulic rebuild workshops
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Oil and gas maintenance contractors in Kuwait
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Refinery and petrochemical shutdown teams
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CNC machining workshops requiring repeatable internal-bore checks
How to Measure a Bore With This Gauge
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Select the appropriate anvil and 0.5 mm washer combination for the nominal bore size.
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Set the gauge against a setting ring or master of known size and establish the reference.
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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 dial indicator and record the deviation from the nominal dimension.
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Repeat the measurement at different depths and positions when checking for taper or ovality.
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Keep the gauge and workpiece at the same temperature for the final inspection reading.
Frequently Asked Questions
What range does the Mitutoyo 511-755 dial bore gauge measure?
It measures internal diameters from 6.5"–10" (165.1–254 mm).
Is a dial indicator included?
Yes. The Mitutoyo 511-755 is supplied with a 0.0001" dial indicator.
Do I need a setting ring?
A setting ring or master of known size is used to establish the reference before measurement. An optional Inside Micro Checker can also be used for setting.
Why does the grip matter?
Heat from the operator's hand can affect dimensional stability. The larger heat-insulating grip reduces heat transfer from the hand by 50%.
Which Mitutoyo model should I choose for a different bore size?
Select a model whose measuring range covers the required bore. The 511-754 covers 4"–6.5", the 511-755 covers 6.5"–10", and the 511-756 covers 10"–16".
Can the Mitutoyo 511-755 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 inspection and schedule periodic calibration as required.
How do I order the Mitutoyo 511-755 in Kuwait?
Pricing is quote-based. Call or WhatsApp +965 9807 4888 with the model number and required quantity for pricing and availability.
