Mitutoyo 511-721 Dial Bore Gauge Range 18-35mm, Graduation 0.001 mm

Part No. 511-721 | Range 18–35 mm | Graduation 0.001 mm

General Tech Services LLC — Genuine Mitutoyo Distributor, Kuwait +965 9807 4888

Product Overview

The Mitutoyo 511-721 dial bore gauge measures internal diameters from 18–35 mm with a self-centring two-point head and a supplied 0.001 mm dial indicator. Its centring guide helps align the measuring head across the true bore diameter, making it suitable for checking bore size, taper and ovality.

The latest 511 series design provides a longer plunger stroke while retaining the established gauge design. A carbide contact point provides wear resistance, while the larger heat-insulating grip reduces heat transfer from the operator's hand by 50%, helping maintain stable readings during extended inspection work.

Interchangeable 0.5 mm washers allow fine step adjustment of the anvils, while optional extension rods provide access to deeper bores. Before measurement, set the gauge against a setting ring or optional Inside Micro Checker.

Typical applications include bearing seats, hydraulic cylinder bores, pump housings and gearbox bores. The gauge is suitable for oil and gas maintenance workshops, refinery and petrochemical shutdown crews, and CNC machine shops across Kuwait.

Temperature can affect close-tolerance bore measurements. Steel expands approximately 11.5 μm per metre for every 1 °C. At 35 mm, a 10 °C temperature difference can produce approximately 4.0 μm of dimensional change. Allow the workpiece and gauge to reach the same temperature before taking a final reading.

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Key Benefits

• Self-centring two-point head helps align the gauge with the true bore diameter

• Carbide contact point provides durable wear resistance

• Heat-insulating grip reduces heat transfer from the operator's hand by 50%

• Fine setting with interchangeable 0.5 mm washers

• Optional extension rods support measurement of deeper bores

• Longer plunger stroke for practical bore inspection

• Suitable for checking bore size, taper and ovality

Who This Product Is Best For

• Machine shops checking bearing seats

• QC teams measuring bore size, taper and ovality

• Oil and gas maintenance workshops

• Refinery and petrochemical shutdown crews

• Engine, pump and hydraulic equipment rebuild workshops

• CNC machine shops requiring repeatable bore checks

• Buyers standardising bore inspection procedures across Kuwait

How to Measure a Bore With This Gauge

1. Select the appropriate anvil and 0.5 mm washer combination for the nominal bore size.

2. Set the gauge against a setting ring or master of known size and establish the reference reading.

3. Insert the measuring head into the bore.

4. Rock the gauge gently through the bore until the indicator reaches its turning point.

5. Read and record the deviation from the reference value.

6. Repeat the measurement at different depths and positions to check for taper and ovality.

7. Keep the measuring faces clean and store the gauge in its case between jobs.

Frequently Asked Questions

What range does the Mitutoyo 511-721 dial bore gauge measure?

It measures internal diameters from 18–35 mm.

Is a dial indicator included?

Yes. The 511-721 is supplied with a 0.001 mm dial indicator.

Do I need a setting ring?

For accurate comparative measurement, set the gauge against a setting ring or master of known size before measuring the workpiece.

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%, helping maintain stable readings.

Which model should I choose for a larger bore?

The Mitutoyo 511-722 covers 35–60 mm, making it the adjacent larger-range model to the 511-721.

Can the Mitutoyo 511-721 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 and store the instrument in its case away from direct sunlight and coolant. Avoid dropping the gauge, check the reference reading before inspection work, and schedule periodic calibration as required.

How do I order the Mitutoyo 511-721 in Kuwait?

Pricing is quote-based. Call or WhatsApp +965 9807 4888 with the model number and required quantity for pricing and availability.

Request Pricing & Availability

For the Mitutoyo 511-721 dial bore gauge, call or WhatsApp +965 9807 4888 for Kuwait pricing and availability.