Mitutoyo 129-126 Depth Micrometer, Interchangeable Rods 0-3", 2,5" Base
Part No. 129-126 | Range 0–3" | Graduation 0.001" | Base Size 2.5"
Product Overview
The Mitutoyo 129-126 depth micrometer is an analog, interchangeable-rod instrument designed for measuring the depth of slots, steps, shoulders, recesses and blind holes. It provides a 0–3" measuring range with 0.001" graduation and uses interchangeable Ø4 mm rods to accommodate different measurement depths.
Its 2.5" (63.5 mm) base is made from hardened tool steel and provides a stable reference surface while remaining suitable for narrower features and tighter spaces where a larger base may be less convenient. The measuring surfaces are hardened, precision ground and micro-lap finished for consistent contact with the feature being inspected.
The micrometer head provides a 25 mm measuring span and has a ±3 µm feed specification over its 0–25 mm travel. The rod measuring face has a specified flatness of 0.3 µm, while rod zero point errors are specified as ±4 µm over 0–150 mm and ±6 µm over 0–300 mm.
A ratchet stop helps maintain consistent measuring force, while the spindle lock and rod lock help retain the measurement and selected rod position during inspection. The satin chrome thimble and sleeve provide a clear analog reading without requiring a battery.
The 129-126 is the 2.5" base version of this 0–3" configuration. For the same range with a larger 4" base, see the Mitutoyo 129-130.
Key Benefits
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Interchangeable Ø4 mm rods support measurements across the 0–3" range.
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0.001" graduation provides fine analog measurement resolution.
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2.5" hardened tool steel base suits narrower features and confined measurement areas.
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Ratchet stop helps provide consistent measuring force for repeatable readings.
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Rod lock secures the selected rod position during measurement.
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Spindle lock helps retain the micrometer setting when required.
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Hardened, precision-ground and micro-lap finished measuring surfaces support consistent contact.
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Mechanical operation requires no battery.
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Supplied with a box and key.
Who This Product Is Best For
The Mitutoyo 129-126 is suited to toolrooms, machine shops, quality control departments, metrology environments and maintenance teams that need mechanical depth measurement.
Typical applications include checking machined slots, steps, shoulders, recesses and blind-hole depths, as well as measuring wear or dimensional changes on components.
Its 2.5" base can be useful where the measurement location is relatively narrow or where a larger reference base would make access more difficult.
How to Use
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Select the interchangeable rod appropriate for the depth being measured and fit it to the micrometer head.
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Secure the selected rod using the rod lock.
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Place the hardened base flat against the reference surface, ensuring stable contact.
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Turn the thimble using the ratchet stop until the rod reaches the bottom of the feature.
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Apply the measurement consistently and read the value from the sleeve and thimble.
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Use the spindle lock when required to retain the reading for recording or comparison.
For critical measurements, use the applicable inspection and calibration procedure for the instrument and application.
Frequently Asked Questions
What does the Mitutoyo 129-126 measure?
It is an analog depth micrometer for measuring the depth of slots, steps, shoulders, recesses and blind holes across a 0–3" range.
What is the range and graduation of the 129-126?
The measuring range is 0–3" and the graduation is 0.001". The micrometer head has a 25 mm measuring span.
What is the difference between the 129-126 and 129-130?
Both models have a 0–3" range and 0.001" graduation. The primary difference is the base size: the 129-126 has a 2.5" base, while the 129-130 has a 4" base.
How many rods come with the 129-126?
The rods cover the 0–3" measurement range in 25 mm steps. The exact rod set supplied should be confirmed before ordering. Call +966 569 289 544 for availability details.
Is the 129-126 a metric or inch tool?
It is an inch tool with 0.001" graduation. Its micrometer head specifications are also expressed using a 25 mm measuring span.
Does the 129-126 require a battery?
No. It is a mechanical analog depth micrometer and does not require a battery for operation.
How much does the Mitutoyo 129-126 cost?
Pricing is available on request. Call +966 569 289 544 or submit a quote request for current availability and pricing.
