Description
Product Overview
The Mitutoyo 103-142 is a 125–150mm range outside micrometer built to the exacting standards Mitutoyo’s Japanese toolroom instruments are known for. Designed for the mid-to-large diameter range where a standard 0–25mm mic won’t reach, this instrument closes the gap between a standard mic set and a large-bore application — making it the go-to on the bench when you’re measuring shafts, flanges, turned diameters, or bored components sitting in that 5-inch neighbourhood. Graduated to 0.01mm, it delivers reliable, repeatable readings that hold up in a production or toolroom environment.
- 125–150mm measuring range with 0.01mm graduation — That 25mm window covers a practical spread of shaft and bore diameters in the mid-large range. The 0.01mm (half-a-thou) graduation means you’re reading to a level of precision that satisfies most toolroom and production fits without needing a vernier attachment.
- Hardened and ground anvil and spindle faces — Mitutoyo hardens the measuring faces on these instruments so they resist wear over years of regular use. A worn or pitted measuring face is the fastest way to lose accuracy in a micrometer; on a well-kept example like this one, those faces remain the ground reference you can trust.
- Setting standard included (unused, wax coated) — Outside micrometers in this range cannot be zeroed against a closed anvil-to-spindle contact like a 0–25mm mic. The setting standard is the calibrated reference you need to zero the instrument correctly. The fact this one is still wax-coated and unused is a genuine asset — it hasn’t been knocked around or worn, so it remains a reliable ground reference for zeroing before use.
- Ratchet thimble for consistent measuring force — Repeatable readings depend on applying consistent spindle pressure. The ratchet stop on this mic takes operator feel out of the equation, ensuring you’re not over- or under-loading the measuring faces — critical when you’re chasing tight tolerances on interference or transition fits.
- Ideal for — checking turned shaft diameters and shoulders on the lathe, measuring large-diameter ground components on the surface grinder, verifying bored housing diameters, inspecting flanges and collars, and final-inspection checks on 5-inch-class components in a jobbing or toolroom environment.
Condition
(Used — Good Condition / Well-kept toolroom mic, setting standard unused)
The micrometer itself presents in genuinely good condition. The frame carries the expected patina of a used instrument — light handling marks and minor surface scuffs on the frame body consistent with bench use — but nothing that affects function. The measuring faces on the anvil and spindle are clean and show no visible pitting, scoring, or rounding that would compromise accuracy. The thimble turns smoothly, the ratchet engages cleanly, and the lock nut functions correctly. The original case is present but dirty — the plastic shell has accumulated workshop grime as storage boxes tend to do — purely cosmetic and easily wiped down. Critically, the setting standard remains in its original wax-coated, unused condition, meaning you have an uncompromised ground reference to zero this mic against before putting it to work. As with any used precision instrument, we recommend verifying the zero against the setting standard before first use and, if you require traceable calibration, presenting it to a NATA-accredited lab for formal certification. For general toolroom and production use, the condition of the measuring faces and the pristine setting standard give you a solid starting point for reliable measurement.
Included
- 1 x Mitutoyo 103-142 Outside Micrometer, 125–150mm, 0.01mm graduation
- 1 x Mitutoyo Setting Standard 125mm (No. 167-105 — unused, wax coated)
- 1 x Original Mitutoyo plastic storage case
- 1 x Original instruction papers / manuals
Not Included
No items expected but missing. All standard accessories are present. Traceable calibration certificate not included — recommend NATA calibration if required for quality-system compliance.
Brand Information
Mitutoyo Corporation, founded in Japan in 1934, is the world’s largest manufacturer of precision measuring instruments and sits at the top tier of the global metrology market alongside Mahr and Starrett. Their instruments are the benchmark against which competing brands are measured — literally and figuratively — with Mitutoyo products specified by default in aerospace, automotive, and toolroom environments worldwide. Japanese manufacture, rigorous quality control, and an extensive service and calibration network make Mitutoyo the safe, reliable choice for any workshop where accuracy is non-negotiable.
Specifications
| Feature | Specification |
|---|---|
| Brand | Mitutoyo |
| Model | 103-142 |
| Type | Outside Micrometer |
| Series | 103 — Standard Outside Micrometer |
| Measuring Range | 125–150mm |
| Graduation / Resolution | 0.01mm |
| Accuracy | ±0.004mm (per Mitutoyo specification for this range) |
| Measuring Face Material | Hardened and ground steel |
| Frame Material | Cast iron frame with heat-insulating side plates |
| Thimble | Ratchet stop for consistent measuring force |
| Setting Standard | Mitutoyo No. 167-105, 125mm, 20°C, 0µm deviation (unused) |
| Country of Origin | Japan |
| Condition | Used — Good Condition |
| Included Items | Micrometer, setting standard (unused), original case, instruction papers |
| Not Included | Traceable calibration certificate |
Keywords
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