Description
Product Overview
The Mitutoyo 103-137 is the industry-standard 0-25mm Outside Micrometer (OM Series). It is the most widely used mechanical micrometer in machine shops worldwide, favoured for its reliability and classic feel.
- Precision: Features a measuring accuracy of ±2µm with 0.01mm graduations. The scale is laser-etched on the satin chrome thimble for glare-free reading.
- Ratchet Stop: Equipped with a Ratchet Stop thimble. This mechanism provides a constant measuring force (5-10N), ensuring that every measurement is consistent regardless of who is holding the tool.
- Durability: The measuring faces are Carbide Tipped and micro-lapped to resist wear, while the frame is finished in Mitutoyo’s signature green “Hammertone” baked enamel for heat deflection and grip.
- Standard Model: As the 0-25mm base model, it does not require a setting standard (gauge block) to zero; you simply close the measuring faces.
Condition
New (Sealed).
This micrometer is Brand New and remains sealed in its original packaging. It comes complete with the adjustment wrench, certificate of inspection, and the original plastic storage case inside the box.
Brand Information
Mitutoyo Corporation (est. 1934) is the global benchmark for dimensional metrology. The “103 Series” is their flagship mechanical line, offering a level of spindle smoothness and accuracy that cheaper clones have never managed to replicate.
Specifications
| Feature | Specification |
| Model | 103-137 (OM-25) |
| Range | 0mm – 25mm |
| Graduation | 0.01mm |
| Accuracy | ±2µm |
| Flatness | 0.6µm |
| Thimble Type | Ratchet Stop |
| Finish | Hammertone Green Enamel |
| Included | Micrometer, Wrench, Case, Papers |
Keywords
Mitutoyo, 103-137, 0-25mm micrometer, outside micrometer, ratchet stop micrometer, machinist tools, mechanical micrometer, carbide micrometer, 103 series.




