Jis B 7420 Pdf May 2026

If you need the authentic standard, here are the only legitimate sources:

Once you have obtained the legitimate PDF, here is how to integrate it effectively:

A: No, but they are related. ISO 1938 covers inspection of plain workpieces. JIS B 7420 is more specific to the gauge itself. In many cases, JIS B 7420 is harmonized with ISO standards, but there are distinct differences in wear limits and tolerance classes. Never assume they are interchangeable. jis b 7420 pdf

While not prescriptive, the standard provides guidance on recommended re-certification periods based on usage intensity.

Avoid these pitfalls:

Many engineers ask how JIS B 7420 differs from international equivalents. Here is a quick comparison:

| Feature | JIS B 7420 | ISO 8512 | DIN 876 | | :--- | :--- | :--- | :--- | | Geographic Focus | Japan/Asia | Global | Germany/Europe | | Grades | 0, 1, 2 | 0, 1, 2, 3 | 00, 0, 1, 2 | | Flatness Formula | More stringent for smaller plates | Linear with size | Similar to ISO | | Material Preference | Granite & Cast Iron | Granite only | Cast Iron primarily | If you need the authentic standard, here are

Note: JIS B 7420 tolerances are generally tighter than ISO 8512 for plates under 1,000 mm in length. If you are complying with Japanese customer requirements, always default to JIS.

Before diving into where to find the PDF, it is essential to understand why this standard matters. If your facility exports to Japan or uses

Surface plates form the foundation of precision measurement. Whether you are using a dial gauge, a coordinate measuring machine (CMM), or a height gage, the flatness and rigidity of the surface plate directly affect measurement accuracy. JIS B 7420 defines:

If your facility exports to Japan or uses Japanese-designed equipment, adhering to JIS B 7420 is not optional—it is a contractual and legal necessity.