Description
Condition
Used (Excellent).
This disc micrometer is in excellent used condition. While it shows some minor cosmetic signs of previous ownership consistent with a working tool, it has been well looked after and presents very cleanly. The spindle movement is smooth, and the disc faces are flat and free from damage. It is supplied in its original fitted plastic case, complete with the adjustment spanner.
Product Overview
The Mitutoyo 169-201 is a specialized “Disc Type” micrometer, also frequently referred to as a Gear Tooth Micrometer. It features large, flat 20mm diameter disc anvils rather than the standard small measuring faces. This design serves two primary purposes: firstly, it is the standard tool for measuring the “root tangent length” on spur and helical gears (measuring across multiple teeth). Secondly, the large surface area makes it ideal for measuring the thickness of soft materials like paper, rubber, or felt, as the discs distribute the pressure to prevent the tool from indenting the workpiece. The instrument employs a non-rotating spindle mechanism, meaning the disc does not turn as it advances; this eliminates torque on the part, ensuring that delicate surfaces are not marred or twisted during measurement. It also features a ratchet stop for consistent force application.
Brand Information
Mitutoyo Corporation, established in 1934 in Japan, is the global benchmark for precision metrology. The company is renowned for its specific application tools, such as the Series 169, which are engineered to solve measurement problems that standard micrometers cannot address. Mitutoyo disc micrometers are prized in gear manufacturing and quality control labs for their rigidity and the flatness of their measuring discs, which are ground to strict tolerances to ensure accurate contact across the entire face.
Specifications
| Feature | Specification |
| Model | 169-201 |
| Measuring Range | 0 – 25mm |
| Graduation | 0.01mm |
| Accuracy | ±4µm |
| Anvil Diameter | 20mm |
| Spindle Type | Non-rotating |
| Mechanism | Ratchet Stop |
| Measurable Module | 0.5 – 6 (Gear measurement) |
| Included | Plastic Case, Spanner |
Keywords
Mitutoyo, 169-201, disc micrometer, gear tooth micrometer, paper thickness gauge, root tangent measurement, non-rotating spindle, 0-25mm micrometer, Japanese metrology, machinist tools.
