Mitutoyo 122-112 Blade Micrometer, Hardened Steel Blade 0-25mm, 0.4mm Blade
Part No. 122-112 | Range 25–50 mm | Graduation 0.01 mm | Accuracy ±3 µm
Product Overview
The Mitutoyo 122-112 Series 122 blade micrometer is designed for measuring narrow grooves, keyways, snap-ring grooves, spline roots and O-ring grooves that are difficult to access with a conventional micrometer. Its Type B thin hardened-steel blade provides a 25–50 mm measuring range with 0.01 mm graduation and ±3 µm accuracy.
The 0.4 mm blade is designed to enter narrow measurement features where a standard 0.75 mm blade may not fit. This makes the 122-112 suitable for fine grooves, narrow slots and other restricted features on shafts, pins and turned components.
Its non-rotating spindle keeps the blade aligned with the groove as the micrometer closes, helping reduce twisting between the measuring faces and workpiece. A ratchet stop provides a controlled 3–8 N measuring force to support consistent readings during repeated inspections.
The satin chrome thimble and sleeve provide a clear mechanical metric scale with 0.01 mm graduation. A standard bar is supplied for zero-setting, and the micrometer comes in a fitted protective case for storage and transport.
For a carbide-tipped version with the same 0.4 mm blade thickness, consider the Mitutoyo 122-142. For a more robust 0.75 mm carbide-tipped blade, the 122-162 is another Series 122 option.
For larger components requiring a 50–75 mm measuring range, consider the Mitutoyo 122-103 blade micrometer.
Key Benefits
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Narrow-groove access: The thin 0.4 mm blade fits restricted grooves and slots within the 25–50 mm range.
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Precise dimensional inspection: ±3 µm accuracy and 0.01 mm graduation support detailed measurement work.
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Type B hardened-steel blade: Provides a thin measuring profile for narrow features.
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Non-rotating spindle: Keeps the blade aligned with the groove and reduces twisting during measurement.
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Consistent measuring force: The ratchet stop provides a controlled 3–8 N measuring force.
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Clear mechanical scale: Satin chrome thimble and sleeve provide a readable metric measurement scale.
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Convenient zero-setting: The supplied standard bar allows the micrometer to be checked and zero-set before use.
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Protective storage: Supplied in a fitted case for storage and transport.
For pricing and delivery information for the Mitutoyo 122-112 in Saudi Arabia, call +966 53 132 1586.
Who This Product Is Best For
The Mitutoyo 122-112 is suitable for CNC turning and machining shops, automotive component manufacturers, pump and valve repair workshops, maintenance departments and quality-control teams working with narrow grooves and keyways.
It is useful for quality inspectors checking first-off components, machinists verifying dimensions during production and maintenance engineers measuring shafts and other components before repair or replacement.
The 122-112 is particularly suited to applications where the groove is too narrow for a conventional 0.75 mm blade. Its 0.4 mm hardened-steel blade provides the narrow measuring profile needed for fine grooves, slots and similar restricted features.
How to Use
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Clean the blade faces and the measurement feature before taking a reading.
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Check the micrometer against the supplied standard bar and confirm the zero setting.
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Open the micrometer slightly wider than the feature being measured.
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Position the thin blade-shaped measuring faces squarely inside the groove or keyway.
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Turn the ratchet stop until it clicks two or three times to apply the controlled measuring force.
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Read the sleeve and thimble scale at the 0.01 mm graduation.
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Record the measurement while the micrometer remains correctly positioned on the feature.
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Clean the measuring faces after use and store the instrument in its fitted case.
Frequently Asked Questions
What is the Mitutoyo 122-112 blade micrometer used for?
The 122-112 is designed for measuring groove diameters, keyways, snap-ring grooves, spline roots, O-ring grooves and other narrow features within its 25–50 mm measuring range.
How accurate is the Mitutoyo 122-112?
The 122-112 has ±3 µm accuracy and a 0.01 mm graduation. The specified parallelism of the measuring faces is 3 µm.
Why does the Mitutoyo 122-112 use a non-rotating spindle?
The non-rotating spindle keeps the blade aligned with the groove as the spindle closes. This helps reduce twisting between the blade and workpiece and supports consistent measurements.
What type of blade does the Mitutoyo 122-112 have?
The 122-112 uses a Type B thin hardened-steel blade with a 0.4 mm blade thickness. Its thin profile is intended for narrow grooves and restricted measurement features.
Which 25–50 mm Series 122 blade micrometer should I choose?
The choice depends on the groove width, blade thickness and application. The 122-112 uses a 0.4 mm hardened-steel blade. The 122-142 uses a 0.4 mm carbide-tipped blade, the 122-162 uses a 0.75 mm carbide-tipped blade, and the 122-102 uses a 0.75 mm hardened-steel blade.
Is a setting standard included with the Mitutoyo 122-112?
Yes. A standard bar is supplied for zero-setting because the measuring range begins at 25 mm rather than zero. The micrometer is also supplied in a fitted protective case.
How do I buy the Mitutoyo 122-112 in Saudi Arabia?
Contact General Tech Services on +966 53 132 1586 or email mathews@generaltechsaudi.com for pricing and delivery information. General Tech Services also provides dimensional calibration services for measuring instruments.
