Mitutoyo SURFTEST SJ-410 - Reference Information; Roughness Standard; Evaluating Based on JIS B0601-1982

No. 99MBB765A
23-1
23 REFERENCE
INFORMATION
This chapter explains the surface texture standard and the surface texture parameters.
23.1 Roughness Standard
23.1.1 Evaluating based on JIS B0601-1982
■ Standard cut-off values and evaluation lengths for Ra
Ra Range
Cut-off length (λc)
Evaluation length (ℓn)
Ra ≤ 12.5 µm 0.8 mm 2.4 mm or more
12.5 < Ra ≤ 100.0 µm 2.5 mm 7.5 mm or more
■ Standard cut-off values and evaluation lengths for Rmax
Rmax Range
Sampling length (ℓ)
Rmax ≤ 0.8 µm 0.25 mm
0.8 < Rmax ≤ 6.3 µm 0.8 mm
6.3 < Rmax ≤ 25.0 µm 2.5 mm
25.0 < Rmax ≤ 100.0 µm 8 mm
100.0 < Rmax ≤ 400.0 µm 25 mm
■ Standard cut-off values and evaluation lengths for Rz
Rz range
Sampling length (ℓ)
Rz ≤ 0.8 µm 0.25 mm
0.8 < Rz ≤ 6.3 µm 0.8 mm
6.3 < Rz ≤ 25.0 µm 2.5 mm
25.0 < Rz ≤ 100.0 µm 8 mm
100.0 < Rz ≤ 400.0 µm 25 mm
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