Description
Product Overview
When you’re measuring the wall thickness of a thin-walled tube, checking the width of a keyway slot, or verifying the thickness of a blade or fin where a standard anvil-face mic simply won’t fit, you need a tool purpose-built for the job. A conventional outside micrometer’s wide anvil and spindle face will bridge across a groove or slot, giving you a reading that’s flatly wrong — and in precision work, that’s not a situation you can afford. The Mitutoyo 422-231-30 Blade Micrometer puts narrow, hardened blade-style anvil and spindle faces into a 25–50 mm digital micrometer frame, letting you reach into slots, grooves, keyways, and narrow recesses with the same confidence and resolution you’d expect from a bench-grade instrument. This unit is brand new and factory sealed, complete with calibration certificate and setting ring — ready to go straight to your toolroom.
- Narrow blade anvil and spindle faces (4 mm wide, 0.85 mm thick) — the critical detail: These blades are what separate this mic from a standard outside micrometer. They drop into keyways, grooves, and slots that are physically inaccessible to conventional anvil faces, giving you a real contact measurement rather than a bridging error. Hardened and ground to the same surface quality as Mitutoyo’s standard spindle faces.
- Digital readout with 0.001 mm resolution: The LCD display eliminates thimble interpolation error on the sleeve/thimble barrel — critical when you’re working in confined areas where it’s hard to get your eye on the barrel at the right angle. Origin/zero, inch/metric conversion, and data output via the SPC port mean this mic integrates cleanly into a quality data logging setup if needed.
- 25–50 mm measuring range with hardened and ground frame: The frame is the same high-grade construction as the standard Mitutoyo 293 series — stable under shop-floor temperature swings, resistant to distortion under clamping load. The 25–50 mm range covers the bread-and-butter keyway and slot work found on shafts, gears, and toolholders in that common mid-range size bracket.
- Setting ring and calibration certificate included: The setting ring lets you verify zero at the lower end of the range (25 mm) before use — essential for a blade mic where you can’t simply close the faces and zero in free air the way you would a standard mic. The calibration certificate confirms the instrument has been verified to Mitutoyo’s factory accuracy standard prior to dispatch.
- Ideal for: Measuring keyway width and depth on shafts and bores, checking slot widths on toolholders and fixtures, wall thickness on thin-walled tubing and rings, groove width verification on turned components, and any application in the 25–50 mm range where conventional anvil faces cannot achieve true point contact.
Condition
(New — Factory Sealed)
This Mitutoyo 422-231-30 is factory sealed in its original Mitutoyo carry case with all documentation intact. The blade faces, frame, thimble, and all precision surfaces are in as-manufactured condition — no contact marks, no corrosion, no wear. The digital display and SPC electronics are untested by the seller but are supplied new from Mitutoyo stock with the factory calibration certificate confirming accuracy at the time of manufacture. As with any instrument that has been in storage, it is good practice to verify zero against the supplied setting ring before committing to first-use measurements, and to confirm battery condition prior to use. There are no known defects, omissions, or functional issues with this unit.
Included:
- 1 x Mitutoyo 422-231-30 Blade Micrometer, 25–50 mm, 0.001 mm resolution
- 1 x Original Mitutoyo carry case
- 1 x Setting ring (25 mm reference standard)
- 1 x Calibration certificate
- 1 x Manual / documentation pack (Japanese/English)
Not included: Nothing expected is missing — this is a complete factory package.
Brand Information
Mitutoyo Corporation, founded in Japan in 1934, is the world’s largest manufacturer of precision measuring instruments and occupies the top tier of global metrology alongside Mahr, Tesa, and Starrett. Their instruments are manufactured in Japan to exacting tolerances and are the de facto standard in toolrooms, quality laboratories, and on machine shop floors across Australia and internationally. When you’re specifying a measuring instrument for a quality-critical application, Mitutoyo is the name that needs no further qualification.
Specifications
| Feature | Specification |
|---|---|
| Brand | Mitutoyo |
| Model | 422-231-30 |
| Type | Digital Blade Micrometer (Outside) |
| Series | 422 |
| Measuring Range | 25–50 mm |
| Resolution | 0.001 mm |
| Accuracy | ±0.001 mm (refer to calibration certificate) |
| Blade Face Width | 4 mm |
| Blade Face Thickness | 0.85 mm |
| Display | LCD Digital with SPC data output port |
| Functions | Origin/zero set, inch/mm conversion, SPC output |
| Construction | Hardened and ground steel frame, carbide-tipped blade faces |
| Country of Origin | Japan |
| Condition | New (Factory Sealed) |
| Included Items | Micrometer, carry case, setting ring, calibration certificate, manual |
| Not Included | Nothing — complete factory package |
Keywords
Mitutoyo 422-231-30, Mitutoyo blade micrometer, Mitutoyo digital micrometer 25-50mm, blade micrometer Australia, keyway micrometer, slot measuring micrometer, digital outside micrometer, groove micrometer, toolroom micrometer, precision measuring tools Australia, Mitutoyo 422 series, thin blade micrometer 25-50mm
