Mitutoyo 129-153 Depth Micrometer, Interchangeable Rods 0-300mm, 101mm Base
Part No. 129-153 | Range 0–300 mm | Graduation 0.01 mm | Accuracy ±3 µm | 12 Interchangeable Rods
Product Overview
The Mitutoyo 129-153 depth micrometer is an analog, interchangeable-rod instrument designed for measuring the depth of holes, slots, steps, recesses, counterbores and other machined features across a 0–300 mm range. It uses 12 interchangeable Ø4 mm rods, allowing the measurement range to be extended in 25 mm increments.
The 101.6 × 16 mm hardened base provides a stable reference surface across the opening of the feature being measured. Its measuring surface is hardened, precision ground and micro-lap finished, while the interchangeable rods have lapped measuring faces for consistent contact.
The micrometer head has a 0.01 mm graduation and a specified accuracy of ±3 µm. The interchangeable rod accuracy is specified as ±(2 + L/75) µm, where L represents the maximum measuring length in millimetres. The rod measuring-face flatness is 0.3 µm and the base flatness is 2 µm.
A ratchet stop helps maintain consistent measuring force during repeated measurements, while the measuring rod clamp secures the selected rod in position. This combination is useful when inspecting parts where repeatable depth readings are important.
The 129-153 provides a 0–300 mm range. For applications requiring a smaller measurement range, the Mitutoyo 129-116 covers 0–150 mm.
Key Benefits
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12 interchangeable Ø4 mm rods cover the 0–300 mm measurement range.
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25 mm rod increments provide flexible depth measurement from one instrument.
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0.01 mm graduation supports fine analog measurement.
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±3 µm specified micrometer head accuracy.
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Hardened, precision-ground and micro-lap finished base provides a stable reference surface.
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Lapped rod measuring faces support consistent contact with the feature.
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Ratchet stop helps maintain consistent measuring force.
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Measuring rod clamp secures the selected rod during measurement.
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Supplied in a fitted case.
For pricing and availability of the Mitutoyo 129-153, call +966 569 289 544 for a quote.
Who This Product Is Best For
The Mitutoyo 129-153 is suited to machine shops, toolrooms, mould and die manufacturing, quality control departments, maintenance teams and metrology environments that require depth measurement up to 300 mm.
Typical applications include checking counterbore depths, blind holes, slots, keyways, steps, shoulders and recesses on machined components. It can also be used during first-off inspection, in-process dimensional checks and maintenance inspections where consistent depth measurements are required.
The interchangeable-rod design allows the same micrometer head and base to be used across a broad range of feature depths.
How to Use
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Select the interchangeable rod appropriate for the feature depth and fit it to the micrometer head.
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Secure the selected rod using the measuring rod clamp.
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Check the instrument against the applicable reference surface or calibrated standard before measurement.
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Place the base flat and square across the opening of the feature.
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Turn the thimble until the rod contacts the bottom of the feature, finishing with the ratchet stop to apply consistent measuring force.
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Read the sleeve and thimble scales and account for the selected rod's starting length when determining the total depth.
For critical dimensional inspection, follow the applicable calibration and measurement procedure for the instrument and application.
Frequently Asked Questions
What is the Mitutoyo 129-153 used for?
It is a depth micrometer for measuring holes, slots, steps, recesses, counterbores and similar features across a 0–300 mm range using interchangeable rods.
How accurate is the Mitutoyo 129-153?
The specified micrometer head accuracy is ±3 µm. Interchangeable rod accuracy is specified as ±(2 + L/75) µm, where L is the maximum measuring length in millimetres.
How many interchangeable rods are included?
The 129-153 specification lists 12 × Ø4 mm interchangeable rods with lapped measuring faces. The rods increase the measurement range in 25 mm increments.
What is the base size of the 129-153?
The base measures 101.6 × 16 mm and has a specified flatness of 2 µm.
What is the graduation of the 129-153?
The micrometer has a 0.01 mm graduation and is configured as a metric instrument.
What is the difference between the 129-153 and 129-116?
The 129-153 provides a 0–300 mm measurement range with 12 interchangeable rods, while the 129-116 is intended for measurements up to 150 mm. Confirm the required range before selecting the model.
How do interchangeable rods work?
Each rod provides a different starting length, with the rod set arranged in 25 mm increments. Select the appropriate rod, secure it with the clamp and use the micrometer head to take the final measurement.
How do I buy the Mitutoyo 129-153 in Saudi Arabia?
Call General Tech Services on +966 569 289 544 or email mathews@generaltechsaudi.com to request current pricing and availability.
