Mitutoyo 511-858 Micrometer Head Bore Gauge, 24"–32", 0.0001" Graduation

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Model No. 511-858

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

The Mitutoyo 511-858 micrometer head bore gauge measures large internal diameters from 24"–32" (609.6–812.8 mm) with 0.0001" graduation. Its micrometer head mounted on the anvil allows convenient size setting without requiring a matching setting ring for every dimension. Request a quote in under a minute: call or WhatsApp +965 9807 4888.

Product Overview

The Mitutoyo 511-858 is designed for accurate measurement of very large internal diameters where conventional setting rings can be expensive, heavy and inconvenient to handle. Its micrometer head is mounted directly on the anvil, allowing the required dimension to be set conveniently at the bench.

The gauge features a longer plunger stroke while maintaining its precision. A carbide contact point provides resistance to wear, while the large sponge-structure grip reduces heat transfer from the operator's hand by 50% to help maintain measurement stability.

Sub-anvils provide a wide measuring range, while optional extension rods allow the gauge to reach deeper holes. An optional inside-length standard, such as a setting ring or Inside Micro Checker, can be used to confirm the gauge setting.

Typical applications include large bores in pump and compressor casings, pipe flanges, turbine housings and heavy fabrications. The instrument is suitable for QC inspection, calibration work, machining and fabrication workshops, and maintenance applications.

For large steel components, temperature control is important during precision measurement. At 812.8 mm, a 10°C temperature difference can change the size of a steel part by approximately 93.5 μm, which can affect close-tolerance measurements.

For smaller bore sizes, the Mitutoyo 511-857 covers the 16"–24" range.

Key Benefits

• Measures large internal diameters from 24"–32" (609.6–812.8 mm)

• Micrometer head setting allows large dimensions to be set without a matching setting ring

• Heat-insulating sponge-structure grip reduces heat transfer from the hand by 50%

• Optional extension rods support deep-hole measurement

• Self-centring guide helps align the gauge with the true bore diameter

• Carbide contact point provides long wear resistance

• Sub-anvils provide a wide measuring range

• 0.0001" graduation supports fine measurement of large bores

Call or WhatsApp +965 9807 4888 for pricing and stock availability.

Who This Product Is Best For

• Machine shops checking very large pump and compressor bores

• QC teams measuring bore diameter, taper and ovality

• Maintenance teams working on large industrial equipment

• Engine, pump and hydraulic rebuild workshops

• Fabrication and machining facilities handling large components

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

How to Use

1. Select and fit the appropriate anvil or washer combination for the nominal bore size.

2. Set the gauge to the required dimension using the micrometer head and a suitable master or optional setting standard.

3. Insert the gauge into the bore and gently rock it through the diameter to locate the turning point.

4. Read the deviation from the nominal setting on the indicator.

5. Repeat measurements at different depths and positions when checking for taper or ovality.

6. Keep the measuring faces clean and allow large steel components to reach a stable temperature before close-tolerance measurement.

Frequently Asked Questions

What range does the Mitutoyo 511-858 micrometer head bore gauge measure?

It measures internal diameters from 24"–32" (609.6–812.8 mm).

What is the graduation?

The gauge has a 0.0001" graduation.

Is a dial indicator included?

The supplied product information specifies a 0.0001" indicator. Confirm the exact package contents when requesting a quotation.

Do I need a setting ring?

The micrometer head mounted on the anvil allows the gauge size to be set directly. A setting ring or Inside Micro Checker can be used as an optional inside-length standard for setting confirmation.

Why does the grip matter?

Heat transferred from the operator's hand can affect precision measurement. The sponge-structure grip reduces heat transfer from the hand by 50%, helping improve measurement stability.

Can the gauge measure deep bores?

Yes. Optional extension rods can be used for deep-hole measurement.

Which Mitutoyo model should I choose for a smaller bore?

The 511-858 covers 24"–32". The Mitutoyo 511-857 covers the smaller 16"–24" range.

Can the Mitutoyo 511-858 be recalibrated?

The gauge can be maintained and calibrated periodically through an appropriate calibration service. For traceable measurements, use a suitable ISO/IEC 17025-accredited calibration service.

How should I store and care for it?

Clean the measuring faces after use and store the gauge in its case away from direct sunlight and coolant. Avoid dropping the instrument, check the setting before use and follow an appropriate periodic calibration schedule.

How do I order the Mitutoyo 511-858 in Kuwait?

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

Request Pricing & Availability

For the Mitutoyo 511-858 micrometer head bore gauge, contact General Tech Services LLC for Kuwait pricing and availability.

Call or WhatsApp +965 9807 4888 for a fast quotation.

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