Mahr GmbH, MarSurf M 300 and RD 18
37
Rpk Reduced peak height Rpk DIN EN ISO 13565-1 : 1998
DIN EN ISO 13565-2 : 1998
ISO 13565-1 :1996
ISO 13565-2 :1996
JIS B 0671-1 : 2002
JIS B 0671-2 : 2002
Rk Core roughness depth Rk
Rvk Reduced valley depth Rvk
Mr1 Smallest material ratio Mr1 of the roughness core
profile: Material ratio (in %) of the intersection line
which separates the protruding peaks from the
roughness core profile.
Mr2 Largest material ratio Mr2 of the roughness core
profile: Material ratio (in %) of the intersection line
which separates the deep valleys from the rough-
ness core profile.
A1 Profile peak range A1 (in µm
2
/mm)
A2 Profile valley range A2 (in µm
2
/mm)
Vo Oil-retaining volume Vo (in mm
3
/cm
2
)
Rt Total height Rt of R-profile DIN EN ISO 4287: 1998
ISO 4287: 1997
JIS B 0601: 2001
R3z Arithmetic mean third peak-to-valley height R3z DB N 31007: 1983
RPc Peak count RPc
(dependent on intersection lines C1 and C2):
Number of profile elements (see RSm) per cm
(or per inch) which first exceed the set upper
intersection line C1 and then fall short of the
lower C2.
EN 10049: 2005
ASME B46.1-2002
E DIN EN ISO 4287/A1:
2007-07 (D)
Rmr
tp
Material ratio Rmr or tp
(dependent on reference line CREF and intersec-
tion line C or p; 3 individual values can be se-
lected)
tp (JIS B 0601: 1994) corresponds with Rmr
DIN EN ISO 4287: 1998
ISO 4287: 1997
ASME B46.1-2002
JIS B 0601: 2001
RSm Mean width RSm of profile elements
(formerly: groove spacing)
DIN EN ISO 4287: 1998
ISO 4287: 1997
ASME B46.1-2002
JIS B 0601: 1994 + 2001
Rsk Skewness Rsk of the profile DIN EN ISO 4287: 1998
ISO 4287: 1997
ASME B46.1-2002
JIS B 0601: 2001
S Mean spacing S of local profile peaks JIS B 0601: 1994
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