Mitutoyo 129-112 Depth Micrometer, Interchangeable Rods 0-150mm, 63mm Base
Part No. 129-112 | Range 0–150 mm | Graduation 0.01 mm | Accuracy ±3 µm | 6 Interchangeable Rods
Product Overview
The Mitutoyo 129-112 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 0–150 mm range. It uses 6 interchangeable Ø4 mm rods, with the rods arranged in 25 mm increments to provide flexible depth measurement from a single instrument.
The 63.5 × 16 mm hardened base provides a compact reference surface for measurements where access around the feature is limited. The base has a specified flatness of 1.3 µm, while each rod has a lapped measuring face with a specified flatness of 0.3 µm.
The micrometer head has a 0.01 mm graduation and a specified accuracy of ±3 µm. Interchangeable rod accuracy is specified as ±(2 + L/75) µm, where L represents the maximum measuring length in millimetres.
A ratchet stop helps maintain consistent measuring force during repeated measurements, while the measuring rod clamp secures the selected rod in position. The mechanical analog design requires no battery and is suitable for routine dimensional inspection.
The 129-112 is particularly suited to applications where a narrower base can provide easier access around shoulders, slots and other restricted features. For the same 0–150 mm range with a wider 101.6 × 16 mm base, see the Mitutoyo 129-116.
Key Benefits
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6 interchangeable Ø4 mm rods cover the 0–150 mm measurement range.
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25 mm rod increments provide flexible depth measurement.
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0.01 mm graduation supports fine metric measurement.
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±3 µm specified micrometer head accuracy.
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Compact 63.5 × 16 mm base provides access around narrower features.
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Base flatness is specified at 1.3 µm.
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Rod measuring-face flatness is specified at 0.3 µm.
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Ratchet stop helps maintain consistent measuring force.
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Measuring rod clamp secures the selected rod.
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Supplied in a fitted case.
For pricing and availability of the Mitutoyo 129-112, call +966 569 289 544 for a quote.
Who This Product Is Best For
The Mitutoyo 129-112 is suited to machine shops, toolrooms, mould and die manufacturing, quality control departments, maintenance teams and metrology environments requiring metric depth measurement up to 150 mm.
Typical applications include measuring counterbore depths, blind holes, slots, keyways, steps, shoulders and recesses on machined components. It can also be used for first-off inspection, in-process dimensional checks and maintenance measurements.
Its 63.5 mm base is useful where a compact reference surface is preferred around narrower shoulders and restricted measurement locations. The 101.6 mm-base 129-116 provides the same 0–150 mm range in a wider-base configuration.
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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Position 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 value 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 129-112 used for?
It is an analog depth micrometer for measuring the depth of holes, slots, steps, recesses, counterbores and similar features across a 0–150 mm range.
How accurate is the Mitutoyo 129-112?
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 129-112 specification lists 6 × Ø4 mm interchangeable rods with lapped measuring faces. The rods are arranged in 25 mm increments.
What is the base size of the 129-112?
The base measures 63.5 × 16 mm and has a specified flatness of 1.3 µm.
What is the graduation of the 129-112?
The micrometer has a 0.01 mm graduation and is configured as a metric instrument.
What is the difference between the 129-112 and 129-116?
Both models cover a 0–150 mm measurement range and use 6 interchangeable rods. The 129-112 has a 63.5 × 16 mm base, while the 129-116 has a larger 101.6 × 16 mm base.
What is the difference between the 129-112 and 129-153?
The 129-112 covers 0–150 mm using 6 interchangeable rods. The 129-153 extends the measurement range to 0–300 mm and uses 12 interchangeable rods.
Does the 129-112 require a battery?
No. It is a mechanical analog depth micrometer and does not require a battery for normal operation.
How do I buy the Mitutoyo 129-112 in Saudi Arabia?
Call General Tech Services on +966 569 289 544 or email mathews@generaltechsaudi.com to request current pricing and availability.
