Mitutoyo 122-102 Blade Micrometer, Hardened Steel Blade 25-50mm, 0.75mm Blade
Part No. 122-102 | Range 25–50 mm | Graduation 0.01 mm | Accuracy ±3 µm
The Mitutoyo 122-102 Series 122 blade micrometer is designed for measuring groove diameters, keyways, snap-ring grooves, spline roots and O-ring grooves that conventional micrometers may not easily reach. Its 25–50 mm measuring range, 0.01 mm graduation and ±3 µm accuracy make it suitable for dimensional inspection of shafts, pins and precision-machined components.
The 0.75 mm Type A hardened steel blade provides a practical combination of access and durability for general groove and keyway measurement. The non-rotating spindle keeps the blade aligned with the measuring feature as the spindle closes, helping maintain consistent contact with the groove walls.
A ratchet stop provides a controlled 3–8 N measuring force, supporting repeatable measurements between operators. The satin chrome thimble and sleeve provide a clear mechanical scale for metric measurements, while the supplied standard bar can be used for zero-setting.
For applications requiring a larger measuring range, consider the Mitutoyo 122-103 blade micrometer covering 50–75 mm.
Key Benefits
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25–50 mm measuring range for groove and keyway inspection.
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Type A 0.75 mm hardened steel blade for general-purpose use.
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±3 µm accuracy with 0.01 mm graduation.
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Non-rotating spindle helps keep the blade aligned inside grooves and keyways.
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Ratchet stop provides a controlled 3–8 N measuring force.
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Satin chrome thimble and sleeve provide an easy-to-read analog scale.
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Standard bar included for zero-setting.
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Supplied in a fitted protective case.
For pricing and delivery availability of the Mitutoyo 122-102, call +966 53 132 1586.
Who This Product Is Best For
The Mitutoyo 122-102 is suitable for CNC machining shops, precision manufacturing, pump and valve repair, automotive component production and industrial maintenance teams working with groove and keyway dimensions from 25 to 50 mm.
It can also be useful for quality inspectors checking first-off components, machinists verifying dimensions between machining operations and maintenance engineers inspecting shafts before repair or replacement.
How to Use
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Clean the blade measuring faces and inspect the micrometer before measurement.
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Check the zero setting using the supplied standard bar.
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Open the micrometer slightly wider than the groove or keyway being measured.
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Position the blade and spindle squarely against the measuring feature.
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Turn the ratchet stop until the specified measuring contact is established.
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Read the sleeve and thimble scale at 0.01 mm graduation while maintaining the micrometer in position.
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Record the measurement and repeat the check when verification is required.
Frequently Asked Questions
What is the Mitutoyo 122-102 blade micrometer used for?
It is designed for measuring groove diameters, keyways, snap-ring grooves, spline roots and similar recessed features within its 25–50 mm range.
How accurate is the Mitutoyo 122-102?
The 122-102 has a stated accuracy of ±3 µm and a graduation of 0.01 mm. Its measuring-face parallelism is 3 µm.
Why does the 122-102 use a non-rotating spindle?
The non-rotating spindle keeps the blade aligned with the groove as the micrometer closes, helping maintain consistent contact with the measuring surfaces.
Which 25–50 mm Series 122 blade micrometer should I choose?
The 122-102 uses a 0.75 mm hardened steel blade. Other 25–50 mm Series 122 options include the 122-142 with a 0.4 mm carbide-tipped blade, the 122-162 with a 0.75 mm carbide-tipped blade, and the 122-112 with a 0.4 mm thin hardened steel blade. Selection depends on groove access, blade thickness and application requirements.
What is the difference between the 122-102 and 122-102-10?
Both references are associated with the Mitutoyo Series 122 blade micrometer for the 25–50 mm range. The supplied product information identifies the -10 suffix as the current order-number version for this size. Confirm the exact order number and availability with General Tech Services before purchasing.
Is a setting standard included?
Yes. A standard bar is supplied for zero-setting because the measuring range starts at 25 mm rather than zero. The micrometer is also supplied in a fitted case.
How do I buy the Mitutoyo 122-102 in Saudi Arabia?
Contact General Tech Services in Dammam at +966 53 132 1586 or email mathews@generaltechsaudi.com for pricing and delivery availability.
