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.) |
