Mitutoyo 511-921 Dial Bore Gauge Set, Range 18-150mm, Graduation 0.01 mm
Part No. 511-921 | Range 18–150 mm | Graduation 0.01 mm
General Tech Services LLC — Genuine Mitutoyo Distributor, Kuwait +965 9807 4888
Product Overview
The Mitutoyo 511-921 dial bore gauge set covers internal diameters from 18–150 mm in one interchangeable system. Its self-centring bridge helps align the gauge across the true bore diameter, while interchangeable anvils allow the same set to be used across a broad range of bore sizes.
The carbide contact point provides wear resistance for repeated inspection, while the hollow-structure grip reduces heat transfer from the operator's hand by 50%. The supplied dial indicator provides 0.01 mm graduation for detailed internal-diameter measurement.
The 511-921 is suited to workshops that inspect different bore sizes and want one adaptable bore gauge set rather than multiple individual gauges. Typical applications include engine cylinders, pump casings, valve bodies and large bearing housings.
For precision inspection, allow the Mitutoyo 511-921 and the workpiece to reach the same temperature before measuring. Steel expands by approximately 11.5 μm per metre per °C. At 150 mm, a 10°C temperature difference can correspond to approximately 17.2 μm of dimensional change.
Key Benefits
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Wide measuring range — covers 18–150 mm with one interchangeable set
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Self-centring bridge — helps align the measuring head with the true bore diameter
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Carbide contact point — provides wear resistance for repeated measurements
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Heat-insulating hollow-structure 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 provide additional reach
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0.01 mm graduation — supports detailed internal-bore inspection
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Interchangeable anvils — adaptable to different bore sizes within the set's range
Who This Product Is Best For
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Machine shops checking engine cylinders and machined bores
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QC inspectors measuring bore size, taper and ovality
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Power and desalination plant maintenance teams
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Oil and gas service contractors in Kuwait
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Engine, pump and hydraulic rebuild workshops
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Fabrication and machining workshops handling different bore sizes
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Buyers standardising on one Mitutoyo 511-series bore gauge set for repeatable inspections
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 0.01 mm dial 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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Keep the gauge and workpiece at the same temperature before taking the final reading.
Frequently Asked Questions
What range does the Mitutoyo 511-921 dial bore gauge set measure?
It measures internal diameters from 18–150 mm.
Is a dial indicator included?
Yes. The Mitutoyo 511-921 is supplied with a 0.01 mm dial indicator.
Do I need a setting ring?
A setting ring or master of known size is used to establish the reference before measurement and helps achieve consistent results.
Why does the grip matter?
Heat from the operator's hand can affect dimensional stability. The hollow-structure insulating grip reduces heat transfer from the hand by 50%.
What makes the 511-921 suitable for multiple bore sizes?
The set uses interchangeable anvils and a self-centring bridge, allowing one gauge system to cover internal diameters from 18–150 mm.
Can the Mitutoyo 511-921 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 set?
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 511-921 in Kuwait?
Pricing is quote-based. Call or WhatsApp +965 9807 4888 with the model number and required quantity for pricing and availability.
