Mitutoyo 129-127 Depth Micrometer, Interchangeable Rods 0-4", 2.5" Base
Part No. 129-127 | Range 0–4" | Graduation 0.001" | Base Size 2.5"
Product Overview
The Mitutoyo 129-127 depth micrometer uses Ø4 mm interchangeable rods to measure depths across a 0–4" range with a 2.5" base. A ratchet stop helps provide consistent measuring force, while the rod lock secures the selected rod position. The 0.001" graduation supports detailed analog depth measurement, and the instrument is supplied with a box and key.
The hardened tool steel base provides a stable reference surface for measuring slots, steps, shoulders and blind holes. The 2.5" (63.5 mm) base is suited to narrower features and tighter spaces where a wider base may be less convenient.
The interchangeable rods have hardened, precision-ground measuring surfaces with a micro-lap finish. Published specifications include 0.3 µm flatness for the rod measuring face, ±3 µm micrometer head feed over the 0–25 mm travel, and ±4 µm rod zero point error over 0–150 mm.
For a wider reference surface with the same 0–4" range and 0.001" graduation, see the Mitutoyo 129-131 depth micrometer with a 4" base.
Key Benefits
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Interchangeable Ø4 mm rods cover the full 0–4" measuring range.
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2.5" (63.5 mm) hardened tool steel base suits narrower measuring locations.
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0.001" graduation provides detailed analog readings.
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Ratchet stop helps maintain consistent measuring force.
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Rod lock secures the selected rod position during measurement.
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Hardened, precision-ground, micro-lap measuring surfaces support regular inspection work.
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Interchangeable rods provide flexibility for different depth requirements.
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Supplied with a box and key for storage and handling.
Who This Product Is Best For
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Toolrooms and machine shops measuring depths on machined components.
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Quality control teams checking slots, steps, shoulders and blind holes.
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Metrology and inspection teams requiring a mechanical depth reference.
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Maintenance personnel measuring wear or recess depth on components.
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Users who need a 0–4" interchangeable-rod depth micrometer with a narrower 2.5" base.
How to Use
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Select the rod appropriate for the required measuring depth and fit it to the micrometer head. Secure it with the rod lock.
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Place the base flat against the reference surface and position it across the feature being measured.
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Turn the thimble using the ratchet stop until the measuring rod contacts the bottom of the feature.
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Read the measurement from the sleeve and thimble scale and record the result.
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For repeat measurements, maintain the same seating position and measuring technique to improve consistency.
Frequently Asked Questions
What does the Mitutoyo 129-127 measure?
The 129-127 is an analog depth micrometer for measuring depths in features such as slots, steps, shoulders and blind holes.
What is the range and graduation of the 129-127?
The measuring range is 0–4", with a 0.001" graduation and a 25 mm measuring span.
What is the difference between the 129-127 and the 129-131?
Both models have a 0–4" range and 0.001" graduation. The main difference is the base size: the 129-127 has a 2.5" (63.5 mm) base, while the 129-131 has a 4" (101.6 mm) base.
How many rods come with the 129-127?
The interchangeable rods cover the 0–4" range in 25 mm steps. The exact rod set supplied should be confirmed when ordering.
Is the 129-127 a metric or inch tool?
It is an inch-based tool with a 0.001" graduation. Its published specifications also use metric dimensions for certain mechanical characteristics.
How much does the 129-127 cost?
Pricing is available on request. Call +966 569 289 544 or use the quote form to request current pricing and availability.
