Technology

Measurement and Symbol of Surface Roughness

Type Maxi
mum
Height
of
the
Prof
ile
Symbol Rz
Desc
rip
tion

The
maximum
height
of
the
profile
is
distance
between
the
maximum
peak
height
and
the
maximum
valley
depth
from
then
mean
line
in
each
sampling
length.
RZ(ISO/JIS)
is
the
mean
value
of
the
maximum
peak-valley
heights
in
the
evaluation
length.

Type Arithmetic
Mean
Deviation
of
the
Prof
ile
Sym
bol
Ra
Desc
rip
tion
Ra=1÷L×∫L0|f(x)|dx, L=Evaluation Length

The
arith
metic
mean
deviation
of
the
profile
is
the
arith
metic
mean
of
the
absolute
values
of
distances
from
the
mean
line
to
the
profile.

Value
of
Maxi
mum
Height
of
the
Pro
file

Value
of
Arith
meric
Mean
Devia
tion
of
the
Pro
file

Finish
ing
Sym
bol

Indi
cation
of
surface
texture
in
technical
product
document
ation

0.
05S
0.
1S
0.
2S
0.
4S
0.
8S
0.
012a
0.
025a
0.
05a
0.
1a
0.
2a
1.
6S
3.
2S
6.
3S
0.
4a
0.
8a
1.
6a
12.
5S
25S
3.
2a
6.
3a
50S
10
0S
12.
5a
25a