Mitutoyo 511-203 Small Hole Bore Gauge, Range 10 - 18.5 mm, Graduation 0.001 mm

Part No. 511-203 | Range 10–18.5 mm

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

The Mitutoyo 511-203 small hole bore gauge measures small internal diameters from 10–18.5 mm with a self-centring bridge, long plunger stroke and 0.001 mm graduation. It is designed for precise bore inspection where small dimensional differences can affect fit and component performance. Request a quote in under a minute: call or WhatsApp +965 9807 4888.

Product Overview

The Mitutoyo 511-203 is designed for accurate measurement of small bores where a few microns can affect component fit. Its self-centring bridge helps align the gauge with the true bore diameter, while the long plunger stroke supports precise readings.

Interchangeable 0.5 mm washers allow small setting increments, while carbide contact points provide wear resistance for repeated workshop use. The large grip reduces heat transfer from the operator's hand by 50%, helping minimise measurement changes caused by handling.

For best accuracy, set the gauge against a setting ring or master of known size before measuring. Typical applications include small valve bores, injector and hydraulic spool housings, bushings and reamed holes.

The 511-203 is suitable for machine shops, QC teams, engine and hydraulic rebuild workshops, power and desalination plant maintenance teams, and oil and gas service contractors in Kuwait.

Temperature control is also important for precision bore measurement. Steel expands by approximately 11.5 μm per metre per °C. At 18.5 mm, a 10°C temperature difference can shift the reading by approximately 2.1 μm, so allowing the gauge and workpiece to reach the same temperature helps improve measurement consistency.

Key Benefits

• Carbide contact point — provides long wear life.

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

• Fine setting — interchangeable 0.5 mm washers support small setting adjustments.

• Deep-hole ready — optional extension rods can support measurements in deeper bores.

• Self-centring — the guide helps align the measuring head with the true bore diameter.

• 0.001 mm graduation — supports precise small-bore inspection.

• Mitutoyo 511 series — established bore gauge design for workshop and quality-control applications.

Ready to order the Mitutoyo 511-203? Call or WhatsApp +965 9807 4888 for pricing and availability.

Who This Product Is Best For

• Machine shops checking small valve bores, bushings and reamed holes.

• QC teams measuring bore size, taper and ovality.

• Maintenance teams working on power and desalination plant equipment.

• Oil and gas service contractors carrying out precision component inspection.

• Engine, pump and hydraulic rebuild workshops.

• Buyers standardising on Mitutoyo 511-series bore gauges for repeatable inspection.

How to Measure a Bore With This Gauge

1. Fit the appropriate anvil or 0.5 mm washer combination for the nominal bore size.

2. Set the gauge to zero against a setting ring or master of known size.

3. Insert the gauge into the bore without forcing the measuring contacts.

4. Rock the gauge gently through the bore and identify the turning point on the indicator.

5. Record the deviation from the nominal dimension.

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

Frequently Asked Questions

What range does the Mitutoyo 511-203 small hole bore gauge measure?

It measures internal diameters from 10–18.5 mm.

Is a dial indicator included?

Yes, the Mitutoyo 511-203 is supplied with a 0.001 mm indicator.

Do I need a setting ring?

A setting ring or master of known size is recommended for setting the gauge before measurement and achieving accurate readings.

Why does the grip matter?

Heat from the operator's hand can cause the gauge to expand slightly. The large insulating grip reduces heat transfer by 50%, helping improve measurement stability.

Can the Mitutoyo 511-203 measure taper and ovality?

Yes. Take readings at different depths and positions within the bore to identify changes in diameter.

Can it be used for deeper bores?

Optional extension rods can be used when additional reach is required.

Can the Mitutoyo 511-203 be recalibrated?

Yes. Periodic calibration 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 faces clean after use, keep the instrument in its case away from direct sunlight and coolant, and avoid dropping it. Check the zero before use and arrange periodic calibration as required.

How do I order the Mitutoyo 511-203 in Kuwait?

Pricing is quote-based. Call or WhatsApp +965 9807 4888 with the model number and required quantity, and General Tech Services LLC will confirm pricing and availability.

For pricing and stock availability, contact General Tech Services LLC, Kuwait. Call or WhatsApp +965 9807 4888 to request a fast quote.