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 |
1 | 50 | 200 | 50.0 | 2000 | 2200 | The most coarse machining or good rough casting surfaces |
2 | 25 | 100 | 25.0 | 1000 | 1100 | Machining marks very obvious. Rough turning, boring, planning, drilling. |
3 | 12.5 | 50 | 12.5 | 500 | 550 | Machining marks obvious. Rough turning, planning, milling, drilling. |
4 | 6.3 | 25 | 8.00 | 320 | 352 | Machining marks visible. Normal turning, boring, planning, drilling, grinding. |
6.30 | 250 | 275 | ||||
5 | 3.2 | 12.5 | 5.00 | 200 | 220 | Machining marks not obvious, but still visible. Normal turning, boring, planning, drilling, grinding. |
4.00 | 160 | 176 | ||||
3.20 | 125 | 137.5 | ||||
6 | 1.6 | 6.3 | 2.50 | 100 | 110 | Machining marks blur, but marks direction obvious. Number controlled turning, boring, planning, drilling, grinding. |
2.00 | 80 | 88 | ||||
1.60 | 63 | 69.3 | ||||
7 | 0.8 | 6.3 | 1.25 | 50 | 55 | Machining marks direction blur, but still visible. Number controlled turning, boring, planning, drilling, grinding. |
1.00 | 40 | 44 | ||||
0.80 | 32 | 35.2 | ||||
8 | 0.4 | 3.2 | 0.63 | 25 | 27.5 | Machining marks direction blur. Reaming, grinding, boring, rolling. |
0.50 | 20 | 22 | ||||
0.40 | 16 | 17.6 | ||||
9 | 0.2 | 1.6 | 0.20 | 12.5 | 13.75 | Machining marks direction invisible. Grinding, super machining. |
10 | 11 | |||||
8 | 8.8 | |||||
10 | 0.1 | 0.8 | 0.10 | 4 | 4.4 | Surface 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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