The TIMKEN bearing naming guide you will find in this article includes TIMKEN tapered roller bearings, deep groove ball bearings, angular contact ball bearings, super precision bearings, cylindrical roller bearings, spherical roller bearings, thrust bearings.
Timken Tapered Roller Bearing Nomenclature
Part numbering systems for single row radial tapered roller bearings (type TS) are internationally recognized. Several part numbering systems have been developed and can be classified according to either metric or inch systems. Inch system bearings are typically assigned individual part numbers for the inner ring and outer ring, while ISO (metric) bearings are assigned a unique part number for the entire bearing group, which includes the inner ring and outer ring. .
In all part numbering systems, the term bearing series is used to describe bearings with the same basic internal geometry (e.g. roller dimensions, inner ring and outer ring angles). Any inner ring (including roller set) can be combined with any outer ring of the same series, as long as the same type of bearing is used.
Timken Deep Groove Ball Bearing Nomenclature
TIMKEN product catalog
Series code
- 6: extra small
- 618: ultralight
- 619: ultralight
- 161: extra extra light
- 60: extra light
- 62: light
- 63: medium
- 64: heavy
- 160: extra light and thin type
- 620: wide light type
- 630: medium wide type
Hole code
- 00: 10mm
- 01: 12mm
- 02: 15mm
- 03: 17mm
- 04 and later: hole (mm) = code x 5
Common suffixes
- M: brass cage
- TN1: polymer cage
- H: Stainless steel bearing
Closings and resources
- Z: a shield
- ZZ: two shields
- RS: a contact seal
- 2RS: two contact seals
- RZ: a contactless seal
- 2RZ: two non-contact seals
- NR: elastic ring
- N: snap ring groove
Internal settlement
- C2: narrow
- C0/vacuum: normal
- C3: dissolved
- C4: extra loose
- C5: extra extra extra loose
Special code
for example, special grease or non-standard geometric features
TIMKEN Angular Contact Ball Bearings Nomenclature
prefixes
- A: stainless steel
- F: flanged outer ring
- H: tight fit
- J: Extra loose internal fit
- JJ: Extra extra loose inner fit
- L: internal self-aligning
- M: ABEC 3 Accuracy
- Q: Loose fit
- A: Normal fit
- S: Size type extra small in inches
- T: tight fit
- V: ABEC 5 Accuracy
- W: Wide type single line (same inner and outer width)
- WIR: single row, wide interior only
Numbers: series of basic types
- S1: 3, 5, 7, etc., single row inches, extra small
- 30: Single-line metric, extra small
- 100: single line, very large
- 200: single line, light
- 300: single line, medium
- 5200: double row, light
- 5300: double row, medium
- 7200: single row, corner contact, lightweight
- 7300: single row, corner contact, medium
- 7400: single line, corner contact, heavy
- 9100: single row, ultralight
- 9300: single row, ultralight
- XLS: size in inches, Conrad type
Tedious
- 04 and later: multiply the last two numbers by five to obtain the hole in millimeters
- 00: 10mm
- 01: 12mm
- 02: 15mm
- 03: 17mm
suffixes
- C1, C2, C3, etc.: manufacturing code – for Timken® use only
- FT: complete ball complement
- K: Conrad, slotless filler type
- W: Maximum capacity, fill slot type
- WI: angular contact, low outside shoulder
- WO: angular contact, low shoulder in
- WN: angular contact, low shoulder, inside and outside
Additional features
- B: spherical outer diameter
- BR: Bronze Casting Parade
- D: a shield
- DD: two shields
- G: Wireloc (circle)
- L: a mechanical seal
- LL: two mechanical seals
- MBR: machined bronze stop
- Q: a stamp
- PP: two seals
- PP2, 3, 4, etc.: Triple seals if the prefix letter is W (example: W208PPB5)
- A: A rubber floor seal
- RR: two rubber ground seals
- S: external self-alignment
- SMBR: silicon bronze iron seal
- T: a felt seal
- TT: two felt stamps
TIMKEN Super Precision Ball Bearings Nomenclature
Angular contact
contact angle
- 2 = 15°
- 3 = 25°
Accuracy class
- MM/MMV: very high accuracy between ABEC 7 (ISO P4) and ABEC 9 (ISO P2)
- MMX: ultra precision ABEC 9 (ISO P2)
C: hybrid ceramic
Series
- 9300: ultralight
- 9100: extra light
- 99100: extra light
- 200: light
- 300: medium
Construction
- K: Conrad
- WI: angular contact; low shoulder on the outer ring
- WO: angular contact; low shoulder on the inner ring
- WN: angular contact; low shoulder on both rings
- HX: angular contact; low shoulder on both rings
servant
- No seal recalls involve Timken® Fafnir® PRC
- PRB: molded nylon cage
- RPC: Molded Reinforced Nylon Cage
- CR: Phenolic (Composition) – Timken Fafnir Standard
- MBR: worked bronze
- VV: High Speed Seals
Preload: Universal level ground
- * SUX: Single bearing, ultra-light
- *ON: Single bearing, lightweight
- * SOMA: Single bearing, medium
- * SUH: Single bearing, heavy
- DUX: duplex bearing pairs, ultralight
- DUL: Pair of duplex bearings, lightweight
- DUM: Duplex bearing pairs, medium
- DUH: Duplex bearing pairs, heavy
- TUX: triplex bearing set, ultralight
- TUL: triplex bearing set, lightweight
- TUM: triplex bearing set, medium
- TUH: triplex bearing set, heavy
- QUX: quadruplex bearing set, ultralight
- QUL: Quadruplex bearing assembly, lightweight
- QUM: Quadruplex Bearing Set, Medium
- QUH: Quadruplex bearing assembly, heavy
A3188: An example of a non-standard specification number
Timken High Precision Ball Bearings – Ball Screw Bearings
- MM: ABEC 7 (ISO P4) with narrower lateral runout
- BS: Ball screw support series designation by metric number
- Number of bearings in the set
Duplex DU (2)
TU triplex (3)
QU quadruplex (4) - Preload level
I light
medium M
* Heavy H
- MM: ABEC 7 (ISO P4) with narrower lateral runout
- Ball screw holder series designation by number in inches
- Relative hole size:
number
biggest hole biggest - Design: Timken® Fafnir® specific
- Series: High Capacity
- Number of bearings in the set:
Duplex DU (2)
TU triplex (3)
QU quadruplex (4) - Preload level:
I light
medium M
* Heavy H
TIMKEN Cylindrical Roller Bearings Nomenclature
Metric/inch standard cylindrical roller bearing styles
The nomenclature of TIMKEN cylindrical bearings is based on ISO standard designations.
Catalog: TIMKEN cylindrical roller bearings
Dimensional series
Series Width + Series Diameter
10 = series 1 width; diameter series 0 (dimensional series 10)
2 = series width 0; diameter series 2 (dimensional series 02)
22 = series 2 width; diameter series 2 (dimensional series 22)
3 = series width 0; diameter series 3 (dimensional series 03)
23 = series 2 width; diameter series 3 (dimensional series 23)
Nomenclature of ABMA cylindrical roller bearings
- Series:
two digits indicate the metric envelope size and
three digits indicate the size of the envelope - Changes:
(the first two letters are assigned by Timken engineers)
letter other than “O” in the first position indicates modification of the inner ring.
The letter other than “O” in the second position indicates the modification of the outer ring. - Internal radial clearance:
R1
R2
R3 = Standard
R4> R3
R5> R4
Timken Full Complement Cylindrical Roller Bearing (NCF) Nomenclature
Size Series Series
width + diameter series
10 = series 1 width; diameter series 0 (dimensional series 10)
2 = series width 0; diameter series 2 (dimensional series 02)
22 = series 2 width; diameter series 2 (dimensional series 22)
3 = series width 0; diameter series 3 (dimensional series 03)
23 = series 2 width; diameter series 3 (dimensional series 23)
Timken Four Row Cylindrical Roller Bearing Nomenclature
- Identify the type of project:
RY
RYL
RX
RXL - Modification codes:
W33 = Holes and grooves in DE
W30B = Front grooves on inner ring. - Radial internal clearance (RIC):
CF = semi-finished product
C2
C0 = default
C3>C0
C4>C3
C5>C4
C6 = Special game
TIMKEN spherical roller bearings nomenclature
- Common modifications and style codes:
K = conical hole
EJ = 2-piece steel cage – window type
EM/YM = 1 piece brass cage – finger type,
Roller-driven EMB/YMB = 1 piece of brass, finger type,
Ground-Piloted YMD = 2-Piece Brass, Finger Type, Ground-Piloted
W33 = 3 holes and slot in DE
W800 = vibrating screen modification: – tighter bore diameter and outer diameter tolerances – brass cage – RIC on top 2/3 of specified clearance - Radial internal clearance (RIC):
C2
C0= normal
C3>C0
C4>C3
C5>C4
C6 = special game
Nomenclature of SNK TIMKEN SNT spherical blocks
Nomenclature of TIMKEN SAF spherical roller bearings
- Two or four screw SAF pad, cast iron
- Heavy Duty Two or Four Bolt SAFD Pad, Ductile Iron
- Two or four screw SAFS cushion cover, cast steel
- SDAF Four Bolt Heavy Duty Cast Iron Pad
- SDAFD Four Bolt Heavy Type Cushion Cover, Ductile Iron
- SDAFS Heavy Duty Four Bolt Block Bracket, Cast Steel
- FSAF four-bolt damper block, cast iron (only when optional)
- FSAFD four-bolt bearing, ductile iron (only when optional)
- Four-bolt FSAFS, cast steel pad (only when optional)
TIMKEN thrust bearing nomenclature
Nomenclature of thrust ball bearings with cylindrical and tapered screw
TVL: Axial Angular Contact Ball Bearing
DTVL: Thrust angular contact ball bearing – upper and lower complement of balls
TP: Cylindrical roller thrust bearing
TPS: Cylindrical roller thrust bearing with self-aligning washer
TTSX: Thrust tapered roller bearing with convex profile guide
TTSV: Threaded tapered roller thrust bearing with concave profile raceway
TTSF: Thrust tapered roller bearing with flat top profile
Nomenclature of spherical thrust roller bearings
- Series size
92 Light
93 Medium
94 Heavy
95 Extra Heavy - Standard capacity in white, brass cage
EJ Extended capacity, steel cage
EM Extended capacity, brass cage
TIMKEN Spherical Plain Bearing Nomenclature
- SF: normal spherical type (radial inches); single fracture outer ring
- SFH: normal spherical type (radial inches); single fracture outer ring, wide inner ring
- FFS: normal spherical type (radial inches); double fracture outer ring
- SBT: Spherical Normal Angular Contact Type (Radial Inch)
- For sale: normal spherical type (metric radial); single fracture outer ring
- FSH: normal spherical type (metric radial); single fracture outer ring, wide inner ring
