Expression of roughness
s
s
0.1-S
0.2-S
0.4-S
0.8-S
1.6-S
3.2-S
6.3-S
12.5-S
25-S
50-S
100-S
200-S
400-S
0.1以下
0.2以下
0.4以下
0.8以下
1.6以下
3.2以下
6.3以下
12.5以下
25以下
50以下
100以下
200以下
400以下
Standard value of
datum length
datum length
0.25
0.8
2.5
8
25
Symbol
无记号或No mark or……
Forging
精密精
←——
←——
———
———
———
———
——→
Foundry
Die cutting
Hot calendaring
Cold calendaring
Drawing
Extrusion
Rotating drum
Sand blasting
Pressing
Symbol of roughness
Face cutting
End plane cutting
Contour lathe
Milling machine
Finish machining
Filing
Reamer machining
Broaching
Gear shaving
Grinding
Finish machining by honing head
Super finish machining
Polishing
Emery blue
Grinding
Liquid honing
Polishing
Rolling
Spark discharge
contour machining
contour machining
Wire cutting
Chemical grinding
Electrolytic grinding
Electrolytic grinding
