TIMKEN bearing nomenclature

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

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 deep groove ball bearings nomenclature

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

TIMKEN super precision ball bearings nomenclature

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

Ball screw supper bearings, metric nomenclature

  • 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

Ball screw supper bearings, inch nomenclature

  • 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.

TIMKEN cylindrical roller bearing nomenclature
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

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

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

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

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 SNT spherical roller bearing plummer blocks nomenclature

TIMKEN SAF spherical roller bearing pillow 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

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

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

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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