Mitutoyo 122-115 Blade Micrometer, Hardened Steel Blade 250-275mm, 0.75mm Blade
Part No. 122-115 | Range 250–275 mm | Graduation 0.01 mm
Product Overview
The Mitutoyo 122-115 Series 122 blade micrometer is designed for measuring groove diameters, keyways and other recessed features that conventional micrometers cannot easily reach. Its 250–275 mm measuring range makes it suitable for large shafts, pump and turbine rotors, rolls and heavy fabricated components where accurate groove measurements are required.
The micrometer features a 0.75 mm Type A hardened steel blade that can enter narrow grooves while providing durability for regular workshop and inspection applications. Its non-rotating spindle keeps the blade aligned with the groove as the measurement is taken, helping reduce twisting and unnecessary contact with the measured surface.
A ratchet stop provides a constant 3–8 N measuring force to support repeatable readings between operators. The 0.01 mm metric graduation is displayed on the satin chrome thimble and sleeve, while the supplied standard bar allows convenient zero-setting before measurement.
The 122-115 is suited to large-diameter components where a conventional outside micrometer cannot access the required groove or recessed feature.
For a larger measurement range, consider the Mitutoyo 122-116 blade micrometer, covering 275–300 mm.
Key Benefits
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Reach recessed features: The blade-shaped measuring faces provide access to grooves, keyways and other narrow features across the 250–275 mm range.
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Accurate metric measurement: Provides ±6 µm accuracy with 0.01 mm graduation.
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Non-rotating spindle: Keeps the blade aligned with the groove and helps reduce twisting during measurement.
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Repeatable measuring force: The ratchet stop maintains a consistent 3–8 N measuring force.
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Durable blade construction: The 0.75 mm Type A hardened steel blade is designed for regular workshop and inspection use.
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Clear scale reading: Satin chrome thimble and sleeve help reduce glare under workshop lighting.
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Convenient zero-setting: A standard bar is supplied for checking and setting the micrometer before use.
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Protected storage: Supplied in a fitted case for storage and transport.
For pricing and delivery information for the 122-115, call +966 53 132 1586.
Who This Product Is Best For
The Mitutoyo 122-115 is suitable for:
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Heavy engineering and large-part machining workshops.
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Pump and turbine maintenance and overhaul teams.
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Rolling mills and manufacturers working with large shafts and rolls.
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Quality inspectors checking groove and keyway dimensions.
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Machinists verifying dimensions during production.
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Maintenance engineers measuring large components before repair or rebuild.
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Metrology and dimensional inspection teams working with metric drawings.
How to Use
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Clean the measuring blade faces and the feature being measured.
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Check the micrometer against the supplied standard bar and verify the zero setting.
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Open the micrometer slightly wider than the groove or feature.
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Position the 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 consistent measuring force.
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Read the sleeve and thimble scale at the 0.01 mm graduation and record the measurement while the micrometer remains correctly positioned.
Frequently Asked Questions
What is the Mitutoyo 122-115 blade micrometer used for?
It is designed to measure groove diameters, keyways and other recessed or narrow features within its 250–275 mm range. The blade-shaped measuring faces can access locations that conventional micrometers may not reach.
How accurate is the Mitutoyo 122-115?
The 122-115 has an accuracy of ±6 µm and a graduation of 0.01 mm. Its measuring-face parallelism is specified as (3 + R/100) µm, where R is the maximum range in millimetres.
Why does the 122-115 use 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 measured surface and supports consistent measurements.
What blade does the Mitutoyo 122-115 use?
It uses a Type A hardened steel blade with a thickness of 0.75 mm. This provides access to many groove and keyway applications while offering durability for regular use.
Is a setting standard included?
Yes. A standard bar is supplied for zero-setting because the 122-115 has a 250–275 mm range rather than starting from zero. The micrometer is also supplied in a fitted case.
What is the measuring force of the 122-115?
The ratchet stop provides a constant measuring force of approximately 3–8 N to help maintain repeatable measurements.
Which Series 122 blade micrometer should I choose?
The 122-115 covers 250–275 mm. If your required measurement falls in the next range, the Mitutoyo 122-116 covers 275–300 mm with the same Type A hardened steel blade design.
How do I buy the Mitutoyo 122-115 in Saudi Arabia?
Contact General Tech Services in Dammam at +966 53 132 1586 or email mathews@generaltechsaudi.com for pricing and delivery information.
