Mitutoyo 526-127 Extra Small Hole Bore Gauge, Range 10 - 18 mm , Graduation 0.01 mm
Part No. 526-127 | Range 10–18 mm | Graduation 0.01 mm
General Tech Services LLC — Genuine Mitutoyo Distributor, Kuwait +965 9807 4888
Product Overview
The Mitutoyo 526-127 extra small hole bore gauge measures internal diameters from 10–18 mm using a split two-point contact designed for small bores. Unlike pin gauges that generally provide a pass/fail indication, this bore gauge provides a measured reading for process and quality control.
The contact point has a hard chrome finish for durability, while the supplied analogue indicator provides 0.01 mm graduation. The indicator can be replaced with a customer-supplied Mitutoyo Digimatic indicator where digital measurement is required.
Typical applications include small valve bores, injector and hydraulic spool housings, bushings and reamed holes. The 526-127 is suited to machine shops, power and desalination plant maintenance teams, oil and gas service contractors and other industrial inspection teams in Kuwait.
Temperature control is important when measuring small, close-tolerance bores. Steel expands by approximately 11.5 μm per metre per °C. At 18 mm, a 10°C temperature difference can correspond to approximately 2.1 μm of dimensional change. Allow the gauge and workpiece to reach the same temperature before taking a final reading.
Key Benefits
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Small-bore measurement — covers 10–18 mm
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Split two-point contact — designed for measuring small internal bores
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Hard chrome contact finish — provides a durable measuring surface
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0.01 mm graduation — provides a direct analogue measurement
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Digital upgrade capability — compatible with a customer-supplied Digimatic indicator
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Measured size rather than pass/fail — useful for process and quality control
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Mitutoyo 526 series — designed for precision small-bore inspection
Who This Product Is Best For
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Machine shops checking small valve bores
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QC inspectors measuring small internal diameters, 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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CNC machining workshops
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Engine, pump and hydraulic rebuild workshops
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Industrial maintenance teams
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Buyers standardising on the Mitutoyo 526-127 for repeatable small-bore checks
How to Measure a Small Bore With This Gauge
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Select the appropriate contact arrangement for the nominal hole 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 without forcing the measuring contact.
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Gently rock the gauge through the bore and identify the turning point on the 0.01 mm indicator.
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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 526-127 extra small hole bore gauge measure?
It measures internal diameters from 10–18 mm.
Is a dial indicator included?
Yes. The gauge is supplied with an analogue indicator with 0.01 mm graduation. It can be replaced with a customer-supplied Digimatic indicator where digital readings are required.
Can I use a Digimatic indicator with the 526-127?
Yes. The analogue indicator can be replaced with a customer-supplied Digimatic indicator for digital measurement.
Do I need a setting ring?
A setting ring or master of known size is used to establish the reference before measurement and helps maintain consistent results.
What is the advantage over pin gauges?
A pin gauge is generally used to determine whether a hole accepts a particular size, while the 526-127 provides a measured bore reading that can be used to assess dimensional variation.
Why is the hard chrome contact important?
The hard chrome finish provides a durable contact surface for repeated small-bore measurements.
Which model should I choose if my bore is outside 10–18 mm?
Choose a Mitutoyo small-hole bore gauge whose measuring range covers the required internal diameter. The 526-127 covers 10–18 mm.
Can the Mitutoyo 526-127 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?
Wipe the measuring contact clean 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 526-127 in Kuwait?
Pricing is quote-based. Call or WhatsApp +965 9807 4888 with the model number and required quantity for pricing and availability.
