The Japanese Industrial Standards (JIS) are the national standards applicable to industrial activities in Japan. The "B" classification specifically relates to . Within this category, JIS B 0419 is the standard that specifies the dimensional tolerances and accuracy for sintered machine parts—components created through powder metallurgy.
The tolerances vary depending on the nominal size of the feature. Below are typical values for the (geometrical) portion of the designation: 1. Straightness and Flatness (Class K) Nominal Length (mm) Tolerance (mm) 100 to 300 300 to 1000 1000 to 3000 2. Perpendicularity (Class K) Shorter Side Length (mm) Tolerance (mm) 100 to 300 300 to 1000 1000 to 3000 3. Symmetry and Run-out (Class K) jis b 0419-mk
The standard typically includes the following machining methods: The Japanese Industrial Standards (JIS) are the national
This dual-labeling system is functionally identical to the international standard. Geometrical Tolerances (The "K" Component) The tolerances vary depending on the nominal size
Nevertheless, for the next decade, physical JIS B 0419-mk comparators will remain a mandatory tool in Japanese and Asian machine shops.
The standard divides parts based on their intended function and precision requirements: