Mitutoyo 129-129 Depth Micrometer, Interchangeable Rods 0-2", 4" Base
Part No. 129-129 | Range 0–2" | Graduation 0.001" | Accuracy ±0.00012" | 2 Interchangeable Rods
Product Overview
The Mitutoyo 129-129 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 0–2" range. It uses 2 interchangeable Ø4 mm rods, with a 1" rod increment, allowing the instrument to cover the specified measurement range.
The 4" × 0.63" hardened base provides a broad reference surface across suitable openings. Its hardened, precision-ground and micro-lap finished surface helps provide stable contact when measuring depths on housings, castings, flanges and machined components.
The micrometer head has a 0.001" graduation and a specified accuracy of ±0.00012". 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, while the base flatness is 2 µm.
A ratchet stop helps maintain consistent measuring force during repeated measurements. The measuring rod clamp secures the selected rod in position, while the mechanical analog design provides operation without a battery.
The 129-129 is suited to inch-based depth inspection where a broad 4" reference base is useful. Its 0–2" range makes it appropriate for relatively shallow depth measurements on machined parts.
Key Benefits
-
2 interchangeable Ø4 mm rods cover the specified 0–2" measurement range.
-
1" rod increment provides flexible depth measurement.
-
0.001" graduation supports fine inch-based measurement.
-
±0.00012" specified micrometer head accuracy.
-
4" × 0.63" hardened base provides a broad reference surface.
-
Base is hardened, precision ground and micro-lap finished.
-
Rod measuring faces have a specified flatness of 0.3 µm.
-
Ratchet stop helps maintain consistent measuring force.
-
Measuring rod clamp secures the selected rod.
-
Supplied in a fitted case.
For pricing and availability of the Mitutoyo 129-129, call +966 569 289 544 for a quote.
Who This Product Is Best For
The Mitutoyo 129-129 is suited to machine shops, toolrooms, mould and die manufacturing, quality control departments, maintenance teams and metrology environments requiring inch-based depth measurement up to 2".
Typical applications include checking 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.
The 4" base provides a relatively wide reference surface, making this configuration suitable for measurements across larger openings where additional base support is useful.
How to Use
-
Select the interchangeable rod appropriate for the feature depth and fit it to the micrometer head.
-
Secure the selected rod using the measuring rod clamp.
-
Check the instrument against the applicable reference surface or calibrated standard before measurement.
-
Position the base flat and square across the opening of the feature.
-
Turn the thimble until the rod contacts the bottom of the feature, finishing with the ratchet stop to apply consistent measuring force.
-
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 129-129 used for?
It is an analog depth micrometer for measuring holes, slots, steps, recesses, counterbores and similar features across a 0–2" range.
What is the range and graduation of the 129-129?
The measuring range is 0–2" and the graduation is 0.001". The instrument is configured as an inch-based depth micrometer.
How accurate is the Mitutoyo 129-129?
The specified micrometer head accuracy is ±0.00012". Interchangeable rod accuracy is specified as ±(2 + L/75) µm, where L is the maximum measuring length in millimetres.
How many rods are included with the 129-129?
The supplied specification lists 2 × Ø4 mm interchangeable rods with lapped measuring faces. The rod increment is specified as 1".
What is the base size of the 129-129?
The base measures 4" × 0.63" and has a specified flatness of 2 µm.
Is the 129-129 an inch or metric tool?
It is an inch tool with 0.001" graduation.
Does the 129-129 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 129-129 in Saudi Arabia?
Call General Tech Services on +966 569 289 544 or email mathews@generaltechsaudi.com to request current pricing and availability.
