TIMKEN bearing nomenclature includes TIMKEN tapered roller, deep groove ball, angular contact ball, super precision, cylindrical roller, spherical roller, thrust, spherical plain bearing nomenclature. Please refer to TIMKEN bearing cross reference.
Timken tapered roller bearing nomenclature
The part-numbering systems for single-row radial tapered roller bearings (type TS) are internationally recognized. Several part-numbering systems have been developed that can be classified according to metric or inch systems. Inch system bearings are normally assigned individual part numbers for the inner ring and for the outer ring, whereas ISO (metric) bearings are assigned a unique part number for the bearing assembly as a whole, which includes both inner and outer ring.
In all the part-numbering systems, the term bearing series is used to describe bearings having the same basic internal geometry (e.g. roller size, inner-ring and outer-ring angles). Any inner ring (including roller set) can be matched with any outer ring within the same series providing that the same type of bearing is being used.
More information:
- TIMKEN inch bearings part-numbering system (designation)
- TIMKEN metric bearings part-numbering systems (designation)
Timken deep groove ball bearings nomenclature
Product catalog: TIMKEN deep groove ball bearing
Series Code
- 6: extra small
- 618: extra ultra light
- 619: ultra light
- 161: extra extra light
- 60: extra light
- 62: light
- 63: medium
- 64: heavy
- 160: extra light thin type
- 620: light wide type
- 630: medium wide type
Bore Code
- 00: 10mm
- 01: 12mm
- 02: 15mm
- 03: 17mm
- 04 and up: bore (mm) = code x 5
Common Suffixes
- M: brass cage
- TN1: polymer cage
- H: stainless steel bearing
Closures & Features
- Z: one shield
- ZZ: two shields
- RS: one contact seal
- 2RS: two contact seals
- RZ: one non-contact seal
- 2RZ: two non-contact seals
- NR: snap ring
- N: snap ring groove
Internal Clearance
- C2: tight
- C0/blank: normal
- C3: loose
- C4: extra loose
- C5: extra-extra loose
Special Code
e.g. special grease or non-standard geometry features
TIMKEN angular contact ball bearings nomenclature
Prefixes
- A: stainless steel
- F: flanged outer ring
- H: snug fit
- J: extra loose internal fit
- JJ: extra extra loose internal fit
- L: internal self-aligning
- M: precision ABEC 3
- P: loose fit
- R: normal fit
- S: extra small inch-dimension type
- T: tight fit
- V: precision ABEC 5
- W: wide-type single-row (same width inner and outer)
- WIR: single-row, wide inner only
Numbers: Basic Type series
- S1: 3, 5, 7, etc., single-row inch, extra small
- 30: single-row metric, extra small
- 100: single-row, extra large
- 200: single-row, light
- 300: single-row, medium
- 5200: double-row, light
- 5300: double-row, medium
- 7200: single-row, angular contact, light
- 7300: single-row, angular contact, medium
- 7400: single-row, angular contact, heavy
- 9100: single-row, extra-light
- 9300: single-row, ultra-light
- XLS: inch-dimension, Conrad type
Bore Size
- 04 and up: multiply last two numbers by five to get bore in millimeters
- 00: 10mm
- 01: 12mm
- 02: 15mm
- 03: 17mm
Suffixes
- C1, C2, C3, etc.: manufacturing code - Timken® use only
- FT: full ball complement
- K: Conrad, non-filling slot type
- W: maximum capacity, filling slot type
- WI: angular contact, low-shoulder outer
- WO: angular contact, low-shoulder inner
- WN: angular contact, low-shoulder, inner and outer
Additional Features
- B: spherical outside diameter
- BR: cast bronze retainer
- D: one shield
- DD: two shields
- G: Wireloc (snap ring)
- L: one Mechani-Seal
- LL: two Mechani-Seals
- MBR: machined bronze retainer
- P: one seal
- PP: two seals
- PP2, 3, 4, etc.: Tri-Ply Seals if prefix letter is W (example: W208PPB5)
- R: one land-riding rubber seal
- RR: two land-riding rubber seals
- S: external self-aligning
- SMBR: iron silicon bronze retainer
- T: one felt seal
- TT: two felt seals
TIMKEN super precision ball bearings nomenclature
Angular contact
Contact Angle
- 2 = 15°
- 3 = 25°
Precision Class
- MM/MMV: super high precision between ABEC 7 (ISO P4) and ABEC 9 (ISO P2)
- MMX: ultra precision ABEC 9 (ISO P2)
C: Hybrid ceramic
Series
- 9300: ultra-light
- 9100: extra-light
- 99100: extra-light
- 200: light
- 300: medium
Construction
- K: Conrad
- WI: angular contact; low shoulder on outer ring
- WO: angular contact; low shoulder on inner ring
- WN: angular contact; low shoulder on both rings
- HX: angular contact; low shoulder on both rings
Retainer
- No retainer callout implies Timken® Fafnir® PRC
- PRB: molded nylon cage
- PRC: molded reinforced nylon cage
- CR: phenolic (composition) – Timken Fafnir standard
- MBR: machined bronze
- VV: high speed seals
Preload: Universal Flush Ground
- *SUX: single bearing, extra-light
- *SUL: single bearing, light
- *SUM: single bearing, medium
- *SUH: single bearing, heavy
- DUX: duplex pairs of bearings, extra-light
- DUL: duplex pairs of bearings, light
- DUM: duplex pairs of bearings, medium
- DUH: duplex pairs of bearings, heavy
- TUX: triplex set of bearings, extra-light
- TUL: triplex set of bearings, light
- TUM: triplex set of bearings, medium
- TUH: triplex set of bearings, heavy
- QUX: quadruplex set of bearings, extra-light
- QUL: quadruplex set of bearings, light
- QUM: quadruplex set of bearings, medium
- QUH: quadruplex set of bearings, heavy
A3188: An example of a specification number for other than standard
Timken super precision ball bearings - Ball screw supper bearings
- MM: ABEC 7 (ISO P4) with tighter lateral eccentricity
- BS: Ballscrew Support Series Designation for Metric Number
-
Number of beearings in set
DU duplex (2)
TU triplex (3)
QU quadruplex (4) -
Preload Level
L light
M medium
*H heavy
- MM: ABEC 7 (ISO P4) with tighter lateral eccentricity
- Ballscrew Support Series Designation for inch Number
-
Relative Size of Bore:
larger number
larger bore - Design: Specific Timken® Fafnir®
- Series: High capacity
-
Number of bearings in set:
DU duplex (2)
TU triplex (3)
QU quadruplex (4) -
Preload Level:
L light
M medium
*H heavy
TIMKEN cylindrical roller bearing nomenclature
Standard cylindrical roller bearing styles metric/inch
TIMKEN cylindrical bearing nomenclature is based on the standard ISO designations.
Catalog: TIMKEN cylindrical roller bearings
Dimension series
Width Series + Diameter Series
10 = width series 1; diameter series 0 (dimension series 10)
2 = width series 0; diameter series 2 (dimension series 02)
22 = width series 2; diameter series 2 (dimension series 22)
3 = width series 0; diameter series 3 (dimension series 03)
23 = width series 2; diameter series 3 (dimension series 23)
ABMA radial cylindrical roller bearings nomenclature
-
Series:
two digits indicates metricenvelope dimensions
three digits indicates inchenvelope dimensions -
Modifications:
(First two letters are assigned by Timken engineers)
Letter other than “O” in first position indicates modification to inner ring.
Letter other than “O” in second position indicates modification to outer ring. -
Radial Internal Clearance:
R1 < R2
R2 < R3
R3 = Standard
R4 > R3
R5 > R4
Timken full complement (NCF) cylindrical roller bearing nomenclature
Dimension Series
Width Series + Diameter Series
10 = width series 1; diameter series 0 (dimension series 10)
2 = width series 0; diameter series 2 (dimension series 02)
22 = width series 2; diameter series 2 (dimension series 22)
3 = width series 0; diameter series 3 (dimension series 03)
23 = width series 2; diameter series 3 (dimension series 23)
Timken four-row cylindrical roller bearing nomenclature
-
Identifies Type of Design:
RY
RYL
RX
RXL -
Modification Codes:
W33 = Holes and grooves on O.D.
W30B = Face slots on inner ring. -
Radial Internal Clearance (RIC):
CF = semi-finished
C2 < C0
C0 = standard
C3 > C0
C4 > C3
C5 > C4
C6 = Special Clearance
TIMKEN spherical roller bearings nomenclature
-
Common modification and style codes:
K = tapered bore
EJ = 2-piece steel cage - window type
EM/YM = 1-piece brass cage - finger type, roller piloted
EMB/YMB = 1-piece brass, finger type, land piloted
YMD = 2-piece brass, finger type, land piloted
W33 = 3 holes and groove in O.D.
W800 = shaker screen modification: - tighter bore diameter and O.D. tolerances - brass cage - RIC in upper 2⁄3 of clearance specified -
Radial Internal Clearances (RIC):
C2 < C0
C0 = normal
C3 > C0
C4 > C3
C5 > C4
C6 = special clearance
TIMKEN SNT spherical roller bearing plummer blocks nomenclature
TIMKEN SAF spherical roller bearing pillow blocks nomenclature
- SAF two- or four-bolt pillow block, cast iron
- SAFD two- or four-bolt heavy-duty pillow block, ductile iron
- SAFS two- or four-bolt pillow block, cast steel
- SDAF four-bolt heavy-duty-type pillow block, cast iron
- SDAFD four-bolt heavy-duty-type pillow block, ductile iron
- SDAFS four-bolt heavy-duty pillow block, cast steel
- FSAF four-bolt pillow block, cast iron (only when an option)
- FSAFD four-bolt pillow block, ductile iron (only when an option)
- FSAFS four-bolt pillow block, cast steel (only when an option)
TIMKEN thrust bearing nomenclature
Thrust ball, cylindrical and tapered screwdown bearings nomenclature
TVL: Angular contact thrust ball bearing
DTVL: Angular contact thrust ball bearing – upper and lower complement of balls
TP: Thrust cylindrical roller bearing
TPS: Thrust cylindrical roller bearing with self-aligning washer
TTSX: Screwdown thrust tapered roller bearing with one convex profile race
TTSV: Screwdown thrust tapered roller bearing with one concave profile race
TTSF: Screwdown thrust tapered roller bearing with flat upper race profile
Thrust spherical roller bearings nomenclature
-
Dimension Series
92 Light
93 Medium
94 Heavy
95 Extra heavy -
Blank Standard capacity, brass cage
EJ Extended capacity, steel cage
EM Extended capacity, brass cage
TIMKEN spherical plain bearing nomenclature
- SF: spherical plain type (radial inch); single-fractured outer ring
- SFH: spherical plain type (radial inch); single-fractured outer ring, wide inner ring
- SBB: spherical plain type (radial inch); double-fractured outer ring
- SBT: spherical plain angular contact type (radial inch)
- FS: spherical plain type (radial metric); single-fractured outer ring
- FSH: spherical plain type (radial metric); single-fractured outer ring, wide inner ring
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