Mitutoyo 122-108 Blade Micrometer, Hardened Steel Blade 175-200mm, 0.75mm, Blade
Part No. 122-108 | Range 175–200 mm | Graduation 0.01 mm
Product Overview
The Mitutoyo 122-108 Series 122 blade micrometer is designed for measuring groove and keyway diameters that conventional micrometers cannot easily reach. Its 175–200 mm measuring range, 0.01 mm graduation and ±5 µm accuracy make it suitable for dimensional inspection of gearbox shafts, compressor shafts, bearing journals and other medium-to-large components.
The Type A hardened steel blade is 0.75 mm thick, providing a practical combination of narrow access and durability for routine groove and recess measurements. The non-rotating spindle keeps the blade aligned with the groove as the micrometer closes, helping reduce twisting against the measured surface.
A ratchet stop provides a constant 3–8 N measuring force for repeatable readings between operators. The satin chrome thimble and sleeve help reduce glare under workshop lighting, while the supplied standard bar allows convenient zero-setting before measurement.
For applications requiring the next larger range, see the Mitutoyo 122-109 blade micrometer, which covers 200–225 mm.
Key Benefits
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Reach recessed features: The blade-shaped measuring surfaces fit keyways, grooves and other narrow features across the 175–200 mm range.
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Reliable dimensional inspection: ±5 µm accuracy and 0.01 mm graduation support precise measurement work.
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Non-rotating spindle: Keeps the blade aligned with the groove and reduces twisting against the workpiece.
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Repeatable measuring force: The ratchet stop provides a constant 3–8 N force.
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Durable blade: The 0.75 mm Type A hardened steel blade is suited to regular workshop use.
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Clear metric readings: Satin chrome thimble and sleeve provide a readable analog scale.
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Convenient zero-setting: A standard bar is supplied for checking and setting the instrument before use.
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Protected storage: Supplied in a fitted case for storage and transport.
Who This Product Is Best For
The Mitutoyo 122-108 is suited to rotating-equipment workshops, gearbox rebuilders, heavy machining shops and plant maintenance departments working with groove and keyway dimensions in the 175–200 mm range.
It is useful for quality inspectors checking first-off components, machinists verifying dimensions between production operations, and maintenance engineers measuring worn shafts before repair or refurbishment. It is particularly appropriate where metric drawings require dimensional measurements inside grooves, keyways or other recessed features.
How to Use
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Clean the blade measuring faces and the workpiece before measurement.
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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 beyond the feature being measured.
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Position the blade-shaped measuring surfaces squarely inside the groove or keyway.
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Close the spindle using the ratchet stop until it clicks consistently.
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Read the sleeve and thimble scale and record the measurement while the micrometer remains correctly positioned on the part.
Frequently Asked Questions
What is the Mitutoyo 122-108 blade micrometer used for?
It is used to measure groove diameters, keyways and other recessed features within its 175–200 mm range. Its blade-shaped measuring surfaces can access features that conventional micrometers may not reach.
How accurate is the Mitutoyo 122-108?
The 122-108 has an accuracy of ±5 µm and a graduation of 0.01 mm. Its measuring-face parallelism is specified as (3 + R/100) µm, where R is the maximum measuring range in millimetres.
Why does the 122-108 have a non-rotating spindle?
The non-rotating spindle keeps the blade aligned with the groove as the micrometer closes. This helps reduce twisting against the workpiece and supports consistent measurement positioning.
What is the blade thickness?
The 122-108 uses a Type A hardened steel blade with a thickness of 0.75 mm.
Is a setting standard included?
Yes. A standard bar is included for zero-setting because the measuring range starts at 175 mm rather than zero. The micrometer is also supplied in a fitted case.
Which Series 122 model covers the next range?
The Mitutoyo 122-109 covers 200–225 mm and uses the same general Series 122 blade-micrometer design.
How can I buy the Mitutoyo 122-108 in Saudi Arabia?
Call General Tech Services on +966 53 132 1586 or email mathews@generaltechsaudi.com for pricing and delivery information.
