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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