Machining Surface Finish Chart, Comparator, Method, Degree, Ra, Rz, RMS

Machining Surface Finish Chart, Comparator, Method, Degree, Ra, Rz, RMS

The surface finishes smooth degree is an important requirement, as for the machining to steel and iron castings.

Today, Yide Casting will introduce the conversion in China and USA standard for Ra (um), Ra (micro inch), Rz (um), RMS and finish degree, and the related finish methods as well.

China
Finish Degree
China
Ra (um)
China
Rz (um)
USA
Ra (um)
USA Ra
(micro inch)
USA RMS
(micro inch)
Machining Finish Method
refer to iron-foundry.com
15020050.020002200The most coarse machining or good rough casting surfaces
22510025.010001100Machining marks very obvious.
Rough turning, boring, planning, drilling.
312.55012.5500550Machining marks obvious.
Rough turning, planning, milling, drilling.
46.3258.00320352Machining marks visible.
Normal turning, boring, planning, drilling, grinding.
6.30250275
53.212.55.00200220Machining marks not obvious, but still visible.
Normal turning, boring, planning, drilling, grinding.
4.00160176
3.20125137.5
61.66.32.50100110Machining marks blur, but marks direction obvious.
Number controlled turning, boring, planning, drilling, grinding.
2.008088
1.606369.3
70.86.31.255055Machining marks direction blur, but still visible.
Number controlled turning, boring, planning, drilling, grinding.
1.004044
0.803235.2
80.43.20.632527.5Machining marks direction blur.
Reaming, grinding, boring, rolling.
0.502022
0.401617.6
90.21.60.2012.513.75Machining marks direction invisible.
Grinding, super machining.
1011
88.8
100.10.80.1044.4Surface dark gloss.
Super machining.

The surface finish comparator for milling, turning, reaming and grinding

Yide Casting is a leading iron foundry, provide both casting service and machining service, equipped with imported advanced machining machines in our machining workshop, if you have both casting and machining demands, Yide casting is a good choice for you, we promise good quality casting and machining requirement,  please feel free to contact us for more details.

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