| Prefix | Suffix | Definition |
| . | A | SPECIAL INTERNAL DESIGN OR MANUFACTURING CODE. |
| . | A50 | SHIELDED OR SEALED BALL BEARING WITH PRESSED STEEL CAGE. |
| . | B | 40 DEGREE CONTACT ANGLE FOR ANGULAR CONTACT BALL BEARINGS (7200, 7300) AND 20 DEGREE FOR TAPERED ROLLER BEARINGS. DOUBLE ROW ANGULAR CONTACT BALL BEARING WITH FILLING SLOTS. |
| . | B22 | INTERNAL DESIGN FEATURE OF TAPERED ROLLER BEARINGS. |
| . | B33 | LUBRICATION GROOVE AND HOLES IN OUTER RING OF SPHERICAL ROLLER BEARINGS (=W33) |
| . | BG | UNIVERSAL PAIRING FOR ANGULAR CONTACT BALL BEARINGS (40 DEGREE CONTACT ANGLE). |
| . | C | INTERNAL DESIGN MODIFICATION FOR TAPERED ROLLER BEARINGS. 15 DEGREE ANGULAR CONTACT BALL BEARING. |
| . | C12 | INTERNAL DESIGN MODIFICATION FOR TAPERED ROLLER BEARINGS. |
| . | D.. | SPECIAL GREASE. |
| . | DB | BACK TO BACK PAIRING ("0" CONFIGURATION) |
| . | DT | TANDEM PAIRING. |
| . | E | INCREASED CAPACITY FOR CYLINDRICAL AND SPHERICAL ROLLER BEARINGS. |
| . | E OR EE | STANDARD SINGLE OR DOUBLE SEALS FOR BALL BEARINGS. |
| . | E10 | FRONT LIP SEAL FOR BALL BEARINGS. |
| . | E16 | FRONT LIP SEAL FOR TAPERED ROLLER BEARINGS. |
| . | E22 | SPECIAL RADIAL LIP SEAL. |
| . | E3, E33 | SINGLE OR DOUBLE SEALS FOR HIGH TEMPERATURE BALL BEARINGS. |
| . | E30, E32 | SPECIAL REINFORCED FRONT LIP SEAL. |
| . | EX50 | E10 SEAL PLUS E SEAL. |
| . | F.. | CODE COMBINING SEVERAL SPECIAL FEATURES. |
| . | F107 | MB - B33 - J30 (MB - W33 - C3) |
| . | F245 | MB - B33 - J40 (MB - W33 - C4) |
| . | F600 | SPECIAL BEARING FOR KILN CAR. |
| . | F700 | SPECIAL SHIELDED BALL BEARING FOR HIGH SPEED. |
| . | F800 | SPECIAL BEARING FOR VIBRATING MACHINES. |
| . | FT150 | SEALED SINGLE ROW RADIAL BALL BEARING, FOR TEMPERATURES UP TO 150 C DEGREES (300 DEGREES F). |
| . | G.. | SPECIAL CAGE. |
| . | G13 | ONE PIECE STEEL CAGE FOR CYLINDRICAL ROLLER BEARINGS. |
| . | G14 | POLYAMIDE CAGE |
| . | G15 | GLASS FIBRE REINFORCED PLOYAMIDE CAGE. |
| . | G28 | PRESSED STEEL CAGE FOR CYLIDICAL ROLLER BEARINGS. |
| . | H | 25 DEGREE CONTACT BALL BEARINGS. |
| . | J | RADIAL INTERNAL CLEARANCE AND MANUFACTURING PRECISION. THE FIRST DIGIT DENOTES THE ISO RADIAL INTERNAL CLEARANCE CTAGORY.THESECOND DIGIT DENOTES THE ISO PRECISION CLASS, E.G. : J36: RADIAL INTERNAL CLEARANCE CATAGORY 3, ISO PRECISION CLASS 6 (ABEC 3). EQUIVALENTS: J20 = C2, J30 = C3, J40 = C4 AND J50 = C5. |
| . | JX0 | SPECIAL RADIAL INTERNAL CLEARANCE. |
| . | K | 1/12 TAPERED BORE. |
| . | K30 | 1/30 TAPERED BORE. |
| . | LLS | SPECIAL LABYRINTH SHIELDS FOR SPHERICAL OUTSIDE DIAMETER BEARINGS. |
| . | M | MACHINED BRASS CAGE, CENTERED ON THE ROLLING ELEMENTS. |
| . | M | SPECIAL MANUFACTURING QUALITY CONTROL. |
| . | MA | MACHINED BRASS CAGE, CENTERED ON THE ROLLING ELEMENTS. |
| . | MB | MACHINED BRASS CAGE, CENTERED ON THE INNER RING. |
| . | N | ISO STANDARD GROOVE IN OUTER RING FOR SNAP RING LOCATION. |
| . | N2 | TWO LOCATING SLOTS IN THE OUTER RING (QJ.. SERIES) |
| . | NR(1) | ISO STANDARD GROOVE IN OUTER RING WITH SNAP RING. |
| . | P6X | TAPERED ROLLER BEARINGS OF PRECISION CLASS ISO 6X. |
| . | Q | MODIFIED BORE. |
| . | R | MODIFIED CORNER RADIUS. |
| . | R23 | POINT OF MAXIMUM ECCENTRICITY MARKED ON THE INNER RING. |
| . | S | SPHERICAL OUTSIDE DIAMETER. |
| . | S.. | DESIGN CHANGE INDEX. |
| . | T | FLANGED OUTER RING. |
| . | UA, UB | DESIGN CHANGE INDICES. |
| . | V | INTERNAL DESIGN MODIFICATION. |
| . | X | STANDARD THRUST BEARINGS 51107 X AND 51206 X. |
| . | Y | POLYAMIDE CGAE, SEE G14 |
| . | Z, ZZ | SINGLE OR DOUBLE PRESSED STEEL SHIELDS. |
| . | Z11 | PRESSED STEEL FLINGER FOR E10 SEAL. |
| . | Z15 | PRESSED STEEL FLINGER FOR E10 AND E16 SEALS. |
| CM | . | CONE ASSEMBLY OF TAPERED ROLLER BEARING |
| CUV | . | CUP OF TAPERED ROLLER BEARING |
| D | . | TAPERED ROLLER TWIN LINE DERIVED FROM STANDARD BEARINGS |
| JT | . | SEAL |
| N,NJ,NF,NU,NUP | . | STANDARD CYLINDRICAL ROLLER BEARINGS. |
| N.. OR ..N | . | SPECIAL GROOVE ON THE OUTSIDE DIAMETER |
| Q.. OR ..Q | . | NON ISO BORE DIAMETER. |
| R.. OR ..R | . | SPECIAL CORNER RADII. |
| RN | . | CYLINDRICAL ROLLER BEARING WITHOUT OUTER RING. |
| RNU | . | CYLINDRICAL ROLLER BEARING WITHOUT INNER RING. |
| T | . | ISO STANDARD TAPERED ROLLER BEARING. TAPERED ROLLER THRUST BEARINGS WITH OUTSIDE RETAINER. |
| T.. OR ..T | . | BEARING WITH A NON-STANDARD FLANGED OUTER RING. |
| X.. OR ..X | . | NON STANDARD MODIFICATION OF THE BEARING ENVELOPE. |
| X.. OR ..X | . | NON STANDARD MODIFICATION OF THE BEARING ENVELOPE. |
| X..D | . | TAPERED ROLLER TWIN LINE WITH NON STANDARD ENVELOPE. |
| Y.. OR ..Y | . | MATERIAL MODIFICATION AND/OR SPECIAL HEAT TREATMENT (SPECIAL APPLICATIONS). |
