Page 1572 - MISUMI Thailand Economy Series

[Technical Data]
Roughness Ranges by Various Processes

■ Geometric Tolerances and Symbols
Arithmetic Average Roughness
Ra 0.025 0.05 0.1 0.2 0.4 0.8 1.6 3.2 6.3 12.5 25 50 100
Tolerance Types
0.1
6.3
25
50
1.6
0.4
Maximum Height －S 0.2 －S 0.8 －S 3.2 －S 12.5 －S －S 100 200 400
Traditional Roughness Notations Reference Value of 0.25 0.8 2.5 8 25
－S
－S
－S
－S
－S
Rmax.
－S
－S
Standard Length
(mm)
Finish Symbol △ △ △ △ △ △ △ △ △ △ －
Forging Precise
Casting Precise
Die Casting
Hot Rolling
Cold Rolling
Drawing
Extruding
Tumbling
Sand Blasting
Rolling
Face Milling Precise
Planing
Carving / Slotting
Milling Precise
Precision Boring
Precise
Filing Precise Fine Medium Coarse
Processes Round Turning Precise
Boring
Drilling
Reaming Precise
Broaching Precise
Shaping
Polishing Precise Fine Medium Coarse
Honing Precise
Stone Lapping Precise
Buff Finishing Precise
Fine Sanding Precise
Lapping Precise
Hydro Honing Precise
Burnishing
Roller Finishing
Sinker EDM
Wire Cut, EDM
Chemical Polishing Precise
Electropolishing Precise
The lines used in the Tolerance Zone definitions mean the following.
Thick solid or broken line: Shape Thin dash-dot line: Center line Thick dash-dot line: Datum
Thin alternating long and two short dashed line: Supplementary projection plane or cross section plane Thin solid or broken line: Tolerance range
1567 Thick alternating long and two short dashed line: Projection of shape onto supplementary plane or cross section plane 1568

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