ring gauges

الوصف

there are 3 quality class of ring gauges, third class, fourth class and fifth class. the third class ring gauge is the highest quality, the fourth class in the middle, and then fifth class.
And also they are many different size range(Φ**-Φ**0mm). make an example, nominal diameter  Φ**-Φ*0mm, making deviation ±1.0µm, roundness 0.5µm, linearity 1.0µm. nominal diameter  Φ***-Φ*0mm, making deviation ±1.5µm, roundness 0.5µm, linearity 1.0µm. nominal diameter  Φ***-Φ*0mm, making deviation ±2.0µm, roundness 0.8µm, linearity 1.5µm. nominal diameter  Φ***-Φ**0mm, making deviation ±2.0µm, roundness 1.0µm, linearity 2.0µm. nominal diameter  Φ****-Φ**0mm, making deviation ±2.5µm, roundness 1.0µm, linearity 2.0µm. nominal diameter  Φ****-Φ**0mm, making deviation ±3.5µm, roundness 1.2µm, linearity 2.5µm.