Description
Condition
Used (Presents Like New) – With Defect.
This digital inside micrometer has seen very light use and aesthetically presents as new with a clean, well-maintained body. It comes as a complete set including the original Japanese user guide, inspection certificate, adjustment spanner, and a 25mm setting ring. While the setting ring shows some surface rust on the top and bottom exterior faces, the critical inner measuring face remains flawless and accurate. Please Note: The locking mechanism on this unit is not functioning as intended; the spindle does not lock firmly in place. This specific mechanical fault is the reason for the sale, making this an ideal purchase for a machinist capable of repair or someone who does not require the locking feature for their workflow.
Product Overview
The Niigata Seiki SK MCD334-50I is a high-precision digital instrument designed specifically for the accurate measurement of internal dimensions, such as the inside diameter of cylinders, pipes, and bores. Featuring a measuring range of 25mm to 50mm, it utilises carbide-tipped measuring faces to resist wear and ensure longevity in workshop environments. The unit is equipped with a ratchet stop mechanism, which provides constant measuring force to eliminate user error and ensure repeatable consistency across measurements. Its digital LCD screen offers clear, instant readings with a high resolution, streamlining the inspection process compared to traditional vernier scales.
Brand Information
Niigata Seiki (SK) is a premier Japanese measuring tool manufacturer established in 1960 in Sanjo City, Niigata Prefecture—a region renowned for its metalworking history. The “SK” brand is synonymous with Japanese industrial quality, trusted globally by machinists and engineers for producing instruments that prioritise reliability and high-precision tolerances.4 Their tools are manufactured under strict quality control systems (ISO 9001), ensuring that users receive equipment capable of meeting the rigorous demands of professional metrology.
Specifications
| Feature | Specification |
| Brand | Niigata Seiki SK |
| Model | MCD334-50I |
| Measuring Range | 25mm – 50mm |
| Resolution | 0.001mm |
| Maximum Permissible Error | 6 µm |
| Measuring Faces | Carbide Tipped |
| Display | Digital LCD |
| Power Supply | SR44 (Silver Oxide) Battery |
| Mechanism | Ratchet Stop (Constant Force) |
| Included Accessories | 25mm Setting Ring, Spanner, User Manual (Japanese), Hard case |
Keywords
Niigata Seiki, SK tools, digital inside micrometer, bore gauge, internal measurement, precision machinist tools, 25-50mm micrometer, Japanese metrology, measuring instrument, MCD334-50I, engineering tools, quality control.
