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Material group<br />
DIHART ® Surface<br />
Attainable surface quality<br />
Surface finish class N11 N10 N9 N8 N7 N6 N5 N4 N3 N2 N1<br />
RMS values in µ inch ~985 ~492.5 ~240 ~126 ~63 ~31.5 ~15.7 ~7.8 ~3.9 ~1.5 ~1.1<br />
Mean surface finish R a 25 12.5 6.3 3.2 1.6 0.8 0.4 0.2 0.1 0.05 0.025<br />
Average surface uniformity R z 100 63 40 25 16 10 6.3 4 2.5 1.6 1 0.63 0.25<br />
1<br />
2<br />
P<br />
1.0 – 4.0<br />
structural steel, low alloy steels: case-hardened<br />
steels, heat-treated steel<br />
S<br />
5.0<br />
5.1<br />
special alloys: Inconel<br />
titanium,<br />
titanium alloys<br />
3<br />
M<br />
6.0 – 7.0<br />
K<br />
8.0 – 10.2<br />
stainless steels,<br />
fireproof steels<br />
gray cast iron<br />
ferritic<br />
gray cast iron<br />
perlitic<br />
spheroidal graphite cast iron<br />
ferritic<br />
spheroidal graphite cast iron<br />
perlitic<br />
4<br />
5<br />
12.0<br />
copper alloy, brass<br />
N<br />
13.0<br />
13.1<br />
wrought aluminum alloys<br />
cast aluminum alloy:<br />
Si-content < 10%<br />
6<br />
14.0<br />
cast aluminum alloy:<br />
Si-content > 10%<br />
H<br />
15.0<br />
16.0<br />
hardened steels<br />
< 45 HRC<br />
hardened steels<br />
> 45 HRC, 55 HRC<br />
7<br />
achievable<br />
limited achievability<br />
All other surface values on request.<br />
8<br />
9<br />
99
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