Operating Instructions & Parts Manual
Page 13
Rockwell
Hardness:
Scale/Indentor/Load
Chart
Scale
Symbol
Indentor
Type
Preliminary
Force
N
(kgf)
Total
Force
N
(kgf)
Typical
Applications
A
Spheroconical
Diamond
98.07
(10)
588.4
(60)
Cemented
carbides,
thin
steel,
and
shallow
case
hardened
steel
B
1/16” Carbide Ball
98.07
(10)
980.7
(100)
Copper
alloys,
soft
steels,
aluminum
alloys,
malleable
iron,
etc.
C
Spheroconical
Diamond
98.07
(10)
1471
(150)
Steel,
hard
cast
irons,
pearlitic
malleable
iron,
titanium,
deep
case
hardened
steel,
other
harder
than
HRB
100
D
Spheroconical
Diamond
98.07
(10)
980.7
(100)
Thin
steel
and
medium
case
hardened
steel,
and
pearlitic
malleable
iron
E
1/8” Carbide Ball
98.07
(10)
980.7
(100)
Cast
Iron,
Aluminum
and
magnesium
alloys,
and
bearing
metals
F
1/16” Carbide Ball
98.07
(10)
588.4
(60)
Annealed
copper
alloys
and
thin
soft
sheet
metals
G
1/16” Carbide Ball
98.07
(10)
1471
(150)
Malleable
irons,
copper
‐
nickel
‐
zinc
and
cupro
‐
nickel
alloys
H
1/8” Carbide Ball
98.07
(10)
588.4
(60)
Aluminum, zinc and lead
K
1/8” Carbide Ball
98.07
(10)
1471
(150)
L
¼” Carbide Ball
98.07
(10)
588.4
(60)
M
¼” Carbide Ball
98.07
(10)
980.7
(100)
P
¼” Carbide Ball
98.07
(10)
1471
(150)
R
½” Carbide Ball
98.07
(10)
588.4
(60)
S
½” Carbide ball
98.07
(10)
980.7
(100)
V
½” Carbide ball
98.07
(10)
1471
(150)
15N
Spheroconical
Diamond
29.42
(3)
147.1
(15)
30N
Spheroconical
Diamond
29.42
(3)
294.2
(30)
45N
Spheroconical
Diamond
29.42
(3)
441.3
(45)
15T
1/16” Carbide Ball
29.42
(3)
147.1
(15)
30T
1/16” Carbide Ball
29.42
(3)
294.2
(30)
45T
1/16” Carbide Ball
29.42
(3)
441.3
(45)
15W
1/8” Carbide Ball
29.42
(3)
147.1
(15)
30W
1/8” Carbide Ball
29.42
(3)
294.2
(30)
45W
1/8” Carbide Ball
29.42
(3)
441.3
(45)
15X
¼” Carbide Ball
29.42
(3)
147.1
(15)
30X
¼” Carbide Ball
29.42
(3)
294.2
(30)
45X
¼” Carbide Ball
29.42
(3)
441.3
(45)
15Y
½” Carbide Ball
29.42
(3)
147.1
(15)
30Y
½” Carbide Ball
29.42
(3)
294.2
(30)
45Y
½” Carbide Ball
29.42
(3)
441.3
(45)
Bearing
Metals
and
other
very
soft
or
thin
materials.
Use
smallest
ball
and
heaviest
load
that
doesn’t
give
anvil
effect.
Similar
to
A,
C
and
D
scales
but
for
thinner
gage
material.
Similar
to
B,
F
and
G
scales
but
for
thinner
gage
material.
Very
Soft
Material
