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Rolling bearing tolerancesDefinitions/Measurement principles
Symbol Examples of drawing notations Measurement principle Characteristic
INA/FAG (old) Schaeffler Group (new)
�ds(Ads)
�Ds(ADs)
■ Deviation of single diameter from nominal dimension(diameter)
�dmp(Admp)
�Dmp(ADmp)
■ Deviation of mean diameter from nominal dimension ina single radial plane(diameter, mean)
= roundness or two-pointroundness respectively
Vdp/2Vp/2VDp/2
■ Half variation of diameter in a single radial plane(two-point roundness)
■ Roundness – to MZCI (Mini-mum Zone Circle) is the mini-mum distance between the radii of two concentric circles enclosing the roundnessprofile both inside and outside
■ Waviness
Ødt
157
078 Ødt
157
078
a
157
079
ØDt
ØDt (Dmp)15
7 08
0ØDt (Dmp)
1
157
081
a
157
082 1
t
Ød
157
083
Ød
tVdp/2
157
084
a
permissibledisplay = 2 t
157
085
Ød
t
t 1 � 500
157
086
t
Ød15
7 08
7
standard filter value: 1 � 500standard filter type: Gauß 15
7 08
8
N 030207
waviness toPF4.020W
waviness
157
089
S 103207-ff
157
090
standard analysis: RTA
157
091
Symbol Examples of drawing notations Measurement principle Characteristic
INA/FAG (old) Schaeffler Group (new)
VdmpVmpVDmp
■ Variation of the meandiameter of the various radial planes in relation to each other(two-point parallelism)
■ Parallelism
■ Straightness
■ Variation in wall thickness■ Differential measurement
Ød
t A
A
t
157
094
Ød
tVdmp
157
095
aa
157
096
ØD
A
t A
157
097
ØD
A
t A
157
097
sensingsystem
air bearingsupport
157
098
t
t
circumferencetradial
157
099
tcircumferencetradial
157
101
157
102
tA
B�
tA
BA Ø
B 157
103
A(P
T)
B(PT)
tA
(PT)
B(P
T)t
A(P
T)B
(PT)
�
157
104
157
105
Symbol Examples of drawing notations Measurement principle Characteristic
INA/FAG (old) Schaeffler Group (new)
■ Symmetry
■ Line form tolerance of radii
NT ■ Deviation of singleinclination angle to surface (inclination angle deviation)
NTD ■ Deviation of singleinclination angle to diameter (inclination angle deviation)
ATD ■ Deviation of single taper angle (taper angle deviation)
t A A
Bt
157
106
t A A
Bt
157
106
measure at multiple datum points
157
107
t2QN 4.54
t1
t
R t�
157
108
t2S241004
t1 R
�
157
109
t : 1st and higher order:radius and formdeviation2nd and higherorder:form deviation
1
t :2
157
110
NT
�
157
111
NT
�
±t/L
157
112
L
157
113
NTD
157
114
NTD ±t/L15
7 11
5
M1
M2
L
157
116
ATD
157
117
±t/LATD
157
118
L
M1
M2
157
119
Symbol Examples of drawing notations Measurement principle Characteristic
INA/FAG (old) Schaeffler Group (new)
KiKe
■ Radial variation in wallthickness(radial runout)
SiSe
■ Variation in wall thickness (axial runout)
■ Variation in wall thicknessin cross-sectional plane
�Bs(ABs)
�Cs(ACs)
■ Deviation of single width from nominal dimension
VBsVCs
■ Variation in width
At A
poin
tKi t
157
122
A(PT) t A(PT)
157
123
157
124
A
t ASi
157
125
A(PT)
t A(PT)
157
126
157
127
A point
t A
157
128
A(PT)
t A(PT)
157
129
157
130
Bt
157
131
Bt
157
132
a
157
133
VB
st
157
134
A(PT)
t A(PT)
157
135
a
157
136
Symbol Examples of drawing notations Measurement principle Characteristic
INA/FAG (old) Schaeffler Group (new)
SD ■ Variation of inclinationof outside surface to face
= multiple datum points
Sd.1 ■ Variation of inclinationof bore to face
= multiple datum points
�Ts (ATs)
■ Deviation of actual bearing width from nominal width(section height)
KiaKea
■ Radial runout of inner ringand outer ring on assembledbearing
KiaKea
■ Radial runout of inner ringand outer ring on assembled bearing
Bpo
int
A
t A
A
B
tA
SD
157
141 B
(PT)
A
t A B(PT)
aa
1
157
142
aa
157
143
1
A
t1
AS
d.
157
144
t A B(PT)
A
B(P
T)
aa
1
157
145
aa
157
146
1
T
157
147
T
157
147
turn at least 360�before measuring
157
148
BA
t BKiat AKea
157
149
BA
t BKiat AKea
157
150
Kea Kia
157
151
A
t AKiat AKea
157
152
A
t AKiat AKea
157
153
slightly conicaltest mandrel
157
154
Symbol Examples of drawing notations Measurement principle Characteristic
INA/FAG (old) Schaeffler Group (new)
SiaSea
■ Axial runout of inner ringand outer ring on assembled bearing
rsrs minrs max
■ Chamfer dimensiondependent on form(smallest or largest single chamfer dimension)
r1r2
■ Chamfer dimension not dependent on form
SCCC
■ Indication of characteristic
RaRzRpkRkRvk
■ Surface notation
– ■ Hardness parameters
BA
t Bt A
157
155
BA
t BSeat ASia
157
156
Sea Sia
157
157
rs
157
158
157
158
rs
Gauge
157
159
–r1
–r2
157
160
–r1
–r2
157
161
r2
r1
157
162
HM
30+0,020
KM
157
163 30+0,020 CC
30+0,020 SC
157
164
SC = Significant Characteristic
CC = Critical Characteristic
157
165
c 0,25
0,40,2
Rz 4
�
157
166 Rz 4
U –0,25/Ra 0,4L –0,25/Ra 0,2
157
167
U = upper limitL = lower limit
–0,25 = transmission trait (�c)Ra, Rz = parameter
157
168
Eht = EinsatzhärtungstiefeNht = NitrierhärtetiefeRht = Einhärtungstiefe nach dem Randschichthärten 15
7 16
9
CHD = Case hardening depthNHD = Nitriding hardness depthSHD = Surface hardening depth
157
170
MA
TNR
0314
9275
4-00
00 /
TPI
138
/ G
B-D
/ 2
0061
210
/ Pr
inte
d in
Ger
man
y by
Man
delk
ow G
mbH
Schaeffler KG
Industriestrasse 1–3
91074 Herzogenaurach (Germany)
Internet www.ina.com
E-Mail [email protected]
In Germany:
Phone 0180 5003872
Fax 0180 5003873
From Other Countries:
Phone +49 9132 82-0
Fax +49 9132 82-4950
Schaeffler KG
Georg-Schäfer-Strasse 30
97421 Schweinfurt (Germany)
Internet www.fag.com
E-Mail [email protected]
In Germany:
Phone 0180 5003872
Fax 0180 5003873
From Other Countries:
Phone +49 9721 91-0
Fax +49 9721 91-3435
Every care has been taken to ensure the
correctness of the information contained
in this publication but no liability can be
accepted for any errors or omissions.
We reserve the right to make technical
changes.
© Schaeffler KG · 2006, December
This publication or parts thereof may not
be reproduced without our permission.
TPI 138 GB-D
