Description
Product Overview
When you need to measure large-diameter workpieces with genuine toolroom confidence, the Mitutoyo 104-142A outside micrometer delivers exactly that. Spanning a 300–400mm measuring range with a 0.01mm graduation, this is a precision instrument built for serious production environments, toolrooms, and metrology labs where holding tight tolerances on large bores, shafts, and turned components is non-negotiable. Interchangeable anvil extensions allow the full 100mm range to be covered from a single frame — a practical design that eliminates the need for multiple fixed-range instruments cluttering the bench.
- 300–400mm measuring range with interchangeable anvil extensions — A single frame covers the full 100mm span via a set of precision-ground extension rods and anvils. This means you’re not locked into a fixed 25mm window; instead, you configure the instrument for the diameter at hand, reducing capital outlay and bench clutter without compromising measurement integrity.
- 0.01mm graduation (10-micron resolution) — At this class of instrument, 0.01mm graduation is the accepted standard for large outside micrometers. It gives you reliable resolution for checking shaft diameters, large bearing fits, and bored housing dimensions where you need to confirm you’re within tolerance — not just in the ballpark.
- Friction thimble and locking mechanism — Consistent measuring force is critical on large micrometers where the mass of the frame can introduce error. Mitutoyo’s friction thimble limits applied force to a repeatable standard, and the spindle lock holds your reading securely while you transfer the instrument to the bench for readout — essential when you’re working away from a direct readout position.
- Precision-ground measuring faces and hardened spindle — The contact faces are ground and lapped to Mitutoyo’s published flatness and parallelism tolerances, ensuring that when you close up on a large-diameter component, you’re getting a true measurement rather than an artefact of surface geometry. The hardened spindle resists wear over service life, maintaining accuracy through repeated use.
- Ideal for — Checking large shaft and journal diameters on lathe work, verifying large turned housings and flanges, confirming bearing seat dimensions on heavy machinery components, inspecting large-diameter ring gauges, and any toolroom or quality assurance task requiring reliable outside measurement in the 300–400mm range.
Condition
New (Factory Sealed)
This Mitutoyo 104-142A is presented in factory-new condition, unopened in its original wooden storage and presentation case. The measuring faces, spindle, thimble, and frame show no signs of use, handling wear, or contact marking — exactly as you would expect from a bench-fresh instrument. The precision-ground anvil and spindle faces are unmarked, and the thimble mechanism operates with the characteristic smooth, controlled action of a new Mitutoyo instrument. All interchangeable anvil extension rods are present and in their original protective packaging. The calibration certificate is included, providing a documented accuracy baseline traceable to national measurement standards — a meaningful starting point for any toolroom quality system. As with any precision instrument that has been in storage, it is good practice to verify zero against a certified setting standard or ring gauge before committing it to a critical measurement run, simply to confirm no handling-related shift has occurred during transit.
Included:
- 1 x Mitutoyo 104-142A Outside Micrometer, 300–400mm, 0.01mm graduation
- Interchangeable anvil extension rods (full set for 300–400mm range coverage)
- Original Mitutoyo wooden storage and presentation case
- Calibration certificate
- Original papers and documentation
- Spanner / setting tools (as supplied by Mitutoyo)
Not included: Nothing expected is missing — all original accessories, documentation, and packaging are present as issued from Mitutoyo.
Brand Information
Mitutoyo Corporation, founded in Japan in 1934, is the benchmark name in precision metrology worldwide. Their instruments are manufactured in Japan to exacting internal standards and are found in toolrooms, quality labs, and on production floors from small job shops through to aerospace and automotive OEM facilities. Mitutoyo sits at the top of the global metrology market alongside Mahr, Tesa, and Starrett — instruments that calibration labs and quality systems accept without question.
Specifications
| Feature | Specification |
|---|---|
| Brand | Mitutoyo |
| Model | 104-142A |
| Type | Outside Micrometer with Interchangeable Anvils |
| Series | 104 — Large Outside Micrometer |
| Measuring Range | 300–400mm |
| Graduation / Resolution | 0.01mm |
| Accuracy | ±0.006mm (refer to calibration certificate for verified values) |
| Anvil Type | Interchangeable extension rods — full set included |
| Measuring Face Material | Hardened steel, ground and lapped |
| Frame Material | Cast iron frame with non-thermal grip areas |
| Thimble | Friction thimble for consistent measuring force |
| Locking Mechanism | Spindle lock |
| Country of Origin | Japan |
| Condition | New (Factory Sealed) |
| Included Items | Micrometer, interchangeable anvil extension set, wooden case, calibration certificate, documentation |
| Not Included | Nothing — complete as factory issued |
Keywords
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