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Super-Precision Contact Ball Bearings Designation system
The designations of LiLy super-precision bearings follow a system that consists of a basic designation with or without one or more prefixes and/or suffixes. Examples and the applicable options for angular contact ball bearings are given below.
Examples
Single bearing:
71922 CDGBTNHA/PA9AL | where | 71922 = |
CD = | ||
71922 = | ||
TNHA = | ||
PA9A = | ||
L = |
Matched bearing set:
S7010 ACD/HCP4AQBCC | where | S = |
7010 = | ||
ACD = | ||
HC = | ||
P4A = | ||
QBC = | ||
C = |
Applicable options
Prefixes |
– Open bearing (no designation prefix) |
S Sealed bearing |
V Bearing with NitroMax steel rings and bearing grade silicon nitride Si3N4 balls (hybrid bearing) |
Basic designation |
Bearing series |
718 In accordance with ISO dimension series 18 |
719 In accordance with ISO dimension series 19 |
70 In accordance with ISO dimension series 10 |
72 In accordance with ISO dimension series 02 |
Bearing size |
6 6 mm bore diameter |
7 7 mm bore diameter |
8 8 mm bore diameter |
9 9 mm bore diameter |
00 10 mm bore diameter |
01 12 mm bore diameter |
02 15 mm bore diameter |
03 17 mm bore diameter |
04 (x5) 20 mm bore diameter |
72 (x5) 360 mm bore diameter |
Suffixes - Internal design |
CD 15° contact angle, high-capacity design |
ACD 25° contact angle, high-capacity design |
CE15° contact angle, high-speed E design |
FE18° contact angle, high-speed E design |
ACE25° contact angle, high-speed E design |
CB15° contact angle, high-speed B design |
FB18° contact angle, high-speed B design |
AC25° contact angle, high-speed B design |
FW18° contact angle, high-speed W design |
Suffixes - External design (seals, snap ring groove, etc.) Single bearing – execution and preload |
– Single standalone bearing (no designation suffix) (718 .. D, 719 .. D, 70 .. D, 72 .. D, 719 ..
E, 70 .. E, 719 .. B and 70 .. B series) |
G Single, universally matchable, zero preload (S70 .. W series) |
GA Single, universally matchable, extra light preload (719 .. D, 70 .. D and 72 .. D series) |
GA Single, universally matchable, light preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series) |
GB Single, universally matchable, light preload (719 .. D, 70 .. D and 72 .. D series) |
GB Single, universally matchable, moderate preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series) |
GC Single, universally matchable, moderate preload (719 .. D, 70 .. D and 72 .. D series) |
GC Single, universally matchable, heavy preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series) |
GD Single, universally matchable, heavy preload (719 .. D, 70 .. D and 72 .. D series) |
Suffixes - External design (seals, snap ring groove, etc.) Single bearing – execution and preload |
– (no designation suffix)
|
MA Machined brass, outer ring centred |
TNHA Glass fibre reinforced PEEK, outer ring centred |
TP Glass fibre reinforced PA46, ball centred |
VG275 Glass fibre reinforced PEEK, ball centred |
Suffixes - Materials, heat treatment |
– Carbon chromium steel (no designation suffix) |
HC Balls made of bearing grade silicon nitride Si3N4 (hybrid bearing) |
Suffixes - Accuracy, clearance, preload, quiet running, direct oil-air lubrication features |
Accuracy |
P4 Dimensional and geometrical tolerances in accordance with ISO tolerance class 4 |
P4A Dimensional tolerances in accordance with ISO tolerance class 4, geometrical tolerances in accordance with
LiLy internal tolerances |
P4B Dimensional tolerances in accordance with ISO tolerance class 4, bore and outside diameter and geometrical
tolerances in accordance with LiLy internal tolerances |
P4C Dimensional and geometrical tolerances in accordance with ISO tolerance class 4 |
P2 Dimensional and geometrical tolerances in accordance with ISO tolerance class 2 |
PA9A Dimensional and geometrical tolerances in accordance with ISO tolerance class 2 |
Direct oil-air lubrication features |
H Two lubrication holes on the non-thrust side of the outer ring |
H1 Two lubrication holes on the thrust side of the outer ring |
L Annular groove with two lubrication holes on the non-thrust side of the outer ring and two annular grooves fitted with O-rings in the outer ring |
L1 Annular groove with two lubrication holes on the thrust side of the outer ring and two annular grooves fitted with O-rings in the outer ring |
Suffixes - Bearing sets, matched bearings |
Arrangement |
DBSet of two bearings arranged back-to-back <> |
DFSet of two bearings arranged face-to-face >< |
DTSet of two bearings arranged in tandem << |
DGSet of two bearings for universal matching |
TBTSet of three bearings arranged back-to-back and tandem <>> |
TFTSet of three bearings arranged face-to-face and tandem ><< |
TTSet of three bearings arranged in tandem <<< |
TGSet of three bearings for universal matching |
QBCSet of four bearings arranged tandem back-to-back <<>> |
QFCSet of four bearings arranged tandem face-to-face >><< |
QBTSet of four bearings arranged back-to-back and tandem <>>> |
QFTSet of four bearings arranged face-to-face and tandem ><<< |
QTSet of four bearings arranged in tandem <<<< |
QGSet of four bearings for universal matching |
PBCSet of five bearings arranged tandem back-to-back <<>>> |
PFCSet of five bearings arranged tandem face-to-face >><<< |
PBTSet of five bearings arranged back-to-back and tandem <>>>> |
PFTSet of five bearings arranged face-to-face and tandem ><<<< |
PTSet of five bearings arranged in tandem <<<<< |
PGSet of five bearings for universal matching |
Preload |
– Zero preload, no designation suffix (S70 .. W series) |
A Extra light preload (719 .. D, 70 .. D and 72 .. D series) |
A Light preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series) |
L Light preload – only for matched bearings sets in TBT, TFT, QBT and QFT arrangements (718 .. D, 719 .. E
and 70 .. E series) |
B Light preload (719 .. D, 70 .. D and 72 .. D series) |
B Moderate preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series) |
M Moderate preload – only for matched bearings sets in TBT, TFT, QBT and QFT arrangements (718 .. D, 719 .. E
and 70 .. E series) |
C Moderate preload (719 .. D, 70 .. D and 72 .. D series) |
C Heavy preload (718 .. D, 719 .. E, 70 .. E, 719 .. B and 70 .. B series) |
F Heavy preload – only for matched bearings sets in TBT, TFT, QBT and QFT arrangements (718 .. D, 719 .. E
and 70 .. E series) |
D Heavy preload (719 .. D, 70 .. D and 72 .. D series) |
G... Special preload, expressed in daN e.g. G240 (718 .. D, 719 .. D, 70 .. D, 72 .. D, 719 .. E, 70 .. E, 719 ..B
and 70 .. B series) |
Suffixes - Stabilization (n.a.) |
Suffixes - Lubrication (See 6.2) |
Suffixes - Other variants (n.a.) |