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Fafnir Ball Bearings - Products & Interchange

The Fafnir® brand of bearings traces its founding as "The Fafnir Bearing Company" in New Britain, Connecticut back in 1911.  Founder Howard S. Hart started the company based upon the need at that time for less expensive alternatives to English and German made ball bearings. Since 1911, the Fafnir brand of ball bearings has been owned by a quite a number of companies including Textron, Inc., The Torrington Company (which was owned by Ingersoll Rand), and The Timken Company. Currently, Fafnir is owned by Timken. AST Bearings provides all necessary Timken Bearing Interchange information here.

Fafnir Ball Bearing Product Range

Today, Fafnir products are primarily used as aircraft bearings, and the company is best known for the following categories of precision ball bearings:

  • Fafnir Angular Contact Ball Bearings
  • Fafnir Ceramic Hybrid Ball Bearings
  • Fafnir Mounted Bearings
  • Fafnir Pillow Block Bearings
  • Fafnir Radial Ball Bearings
  • Fafnir Wide Inner Ring Ball Bearings

Fafnir Ball Bearing Interchange

While Fafnir earned a reputation over the years as a high-quality manufacturer of airrcraft bearings & precision ball bearing products, nowadays, engineers and designers find it easy to interchange Fafnir model numbers with a wide range of other high-quality, yet less expensive, alternatives.  Contact us to find out which high-quality alternatives products interchange with Fafnir ball bearings.

Request a Quote for Alternatives to Fafnir Ball Bearings

Fafnir Bearing Part Number System

Understanding Fafnir ball bearing product codes can be daunting at times making catalog selections difficult.  Below is a partial list explaining the Fafnier ball bearing part numbering system.  If you would like assistance understanding the Fafnir ball bearing part numbering system & Timken Bearing Interchange, contact us.


Prefix

Suffix

Definition

0

ž

Super-Quiet Series.

2

ž

12 Degree Contact Angle In Radially Fitted Bearings.

3

ž

25 Degree Contact Angle In Radially Fitted Bearings.

2MM

ž

Abec-7 Precision, 12 Degree Contact Angle.

3MM

ž

Abec-7 Precision, 25 Degree Contact Angle.

A

ž

Stainless Steel.

AA

ž

Any Steel Other Than 52100 And 440C Stainless.

B

ž

Aircraft Torque Tube Type (E.G. B542).

BCP

ž

Bellcrank Type Aircraft Bearing, Plya-Seals (E.G. Bcp4W10) .

CO

ž

Cylindrical Cartridge Unit - (Replacement Bearing Unit Series Muob) .

D

R

Track Roller Type, Aircraft Bearing (E.G. D7R6-2) .

DF

ž

Aircraft Double-Row.

DPP

ž

Aircraft, Double-Row, Plya-Seal Type.

DR

ž

Double Row Industrial Roller Bearings.

DRN

ž

Double Rigid Pillow Block.

DSA

ž

Standard Series Double Pillow Block, Two Wide Inner Ring Bearings With Locking Collars, Each Bearing Single Labyrinth Sealed (Replacement Bearing Unit Series Mua) .

DSADD

ž

Same As Dsa Series Except Furnished With Dust Seal Collars.

DSAO

ž

Same As Dsa Series Except Heavy Series (Replacement Bearing Unit Series Muoa) .

DSAODD

ž

Same As Dsadd Series Except Heavy Series (Replacement Bearing Unit Series Muoa) .

DSP

ž

Double Row Self-Aligning Aircraft Bearing, Plya-Seal, Pre-Lubricated.

DSRP

ž

Aircraft Self-Aligning Roller With Plya-Seals.

DW

ž

Aircraft, Wide, Double-Row.

F

ž

Flanged Outer Ring, Mostly Small Instrument Sizes.

FL

ž

Aircraft Fairlead Bearings.

G

ž

Relubricatable Mechani-Seal, Wide Inner Ring Bearing.

G

ž

Aircraft Guide Roll.

G

KLL

Double Mechani-Seal Wide Inner Ring Power Transmission Bearing, With

G

KLLB

Double Mechani-Seal Wide Inner Ring Power Transmission Bearing, With

G

Y

Push Pull Type Guide Bearing (E.G. G4Y17) .

GD

ž

Aircraft Guide Roll.

GN

ž

Heavy Series, Relubricatable, Wide Inner Ring, Mechani-Seal Bearings.

H

ž

Stamped On Box Only, Designates Snug Internal Fit-Up.

J

ž

Extra Loose Internal Fit.

KA

ž

Aircraft Aero Seal Type.

KF

ž

Aircraft Single Row, Originally Felt Seals, Now Plya-Seals, Same Designation.

KP

ž

Aircraft Single Row Plya-Seal.

KP

A

Full Type Aircraft Bearing, Plya-Seal, Prelubricated, Medium Duty (E.G.

KP

AR

Track Roller Type Aircraft Bearing (E.G. Kp3Ar11-2) .

KP

B

Full Type Aircraft Bearing, Medium Duty, Plya-Seal, Prelubricated (E.G. Kp37B) .

KS

ž

Aircraft, Single-Row, Self-Aligning.

KS

L

Self-Aligning Aircraft Bearing, Metal Shield, Prelubricated (E.G. Ks3L) .

L

ž

Internal Self-Aligning Type.

LAK

ž

Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Series G-Kllb) , Double Mechani-Seal, External Self-Aligning Bearing.

LAO

ž

Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Series Gn-Kllb) , Double Mechani-Seal, External Self-Aligning Bearing.

LC

ž

Cylindrical Cartridge Unit (Replacement Bearing Series G-Kllb) .

LCJ

ž

Flange Cartridge Unit, (Replacement Bearing Series G-Kllb) .

LCJO

ž

Same As Lcj Except Heavy Series (Replacement Bearing Series (G-Kllb) .

LM

ž

L Means Dovetail Or Undercut Cam On Wide Inner Bearings. The "M" Means Closer Bore Tolerances Now Standard.

LP

ž

Special Wide Inner Bearing, Proctor And Schwartz.

LTU

ž

Take-Up Unit, (Replacement Bearing Series G-Kllb) .

M

ž

Abec-3 Tolerance.

M

FS60000

Abec-5 Bearing, (Last Four Digits Of Fs Suffix Are For Customer Specification) .

MC

ž

Motor Cartridge Unit (Replacement Bearing Unit Muoa) .

MM

ž

Super-Precision Type Manufactured To Meet Abec-7 Specification.

MUA

ž

Replacement Bearing Unit For Dsa-Dsadd Pillow Blocks.

MUB

ž

Replacement Bearing Unit For Sa-Sad-Sadd Type Pillow Blocks.

MUOB

ž

Replacement Bearing Unit For Sao, Saod, And Saodd Pillow Blocks.

MV

ž

Abec-7 Modified.

N

ž

Heavy Series, Non-Relubricatable Wide Inner Ring Mechani-Seal Bearings.

N

KLL

Industrial Power Transmission Bearing, Double Sealed, Wide Inner Ring. With Eccentric Locking Collar.

N

KLLB

Industrial Power Transmission Bearing, Double Sealed, Wide Inner Ring With Eccentric Locking Collar, External Self-Aligning.

NLTU

ž

Take-Up Unit Frame, Pressed Steel For Side Mounting.

P

ž

Aircraft Special Pulley Bearings.

P

ž

Stamped On Box Only, Indicates Loose Internal Fit-Up.

PSM

S

Replacement Bearing For Sal Pillow Block.

PSM

TS

Replacement Bearing For Sal Pillow Block.

R

ž

Regular Fit-Up.

R

ž

Single Cage Roller Bearing.

RA

ž

Extended Inner Ring Series With Collar.

RB

ž

Double Shielded Relubricatable Wide Inner Ring Bearings Used In Rubber Pillow Block.

RBG

ž

Rubber Pillow Block With Provision For Relubrication.

RBGF

ž

Rubber Flange Cartridge Unit.

RBGU

ž

Same As Rbg Except Furnished With Corrosion-Resistant Steel Strap.

RE

ž

Aircraft Rod-End Bearing.

REB

ž

Rod-End Type.

REP

ž

Precision Aircraft Rod-Ends.

RS

ž

Rubber Pillow Block, No Provision For Relubrication.

RSC

ž

Rubber Cylindrical Cartridge Unit.

RSU

ž

Same As Rs Except Furnished With Corrosion-Resistant Steel Strap.

S

ž

Known As Aerolite Type For Aircraft Service, Few Special Aircraft Sizes.

S

ž

Small Inch Dimensions Sizes.

S

HD

Dust Seal Collar, Sadd Pillow Block.

S

K

Collar, Wide Inner Power Transmission Bearing (E.G. S1113K) .

S

KD

Dust Seal Collar, Sadd Series Pillow Block.

S

KT

Eccentric Locking Collar For Wide Inner Ring Bearing (E.G. Sll08Kt).

S

KTD

Dust Seal Collar, Sadd Pillow Block.

S

WD

Dust Seal Collar, Saod Or Saodd Pillow Block.

SA

ž

Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Unit Mub Series) Single Labyrinth Sealed External Self-Aligning Bearing.

SA

KD

Dust Seal Collar Only For Sadd Pillow Block.

SA

WD

Dust Seal Collar, Sadd Series Pillow Block.

SAD

ž

Pillow Block Designation, Same As Sa Series Except Furnished With Dust Seal Collar.

SADD

ž

Pillow Block Designation, Same As Sa And Sad Except Furnished With Dust Seal Collar And Rear Dust Seal .

SAL

ž

Direct Mounted Ball Bearing Pillow Block (Replacement Bearing Series Psm-S Or Psm-Ts) , Furnished Fixed Or Floating, External Self-Aligning Bearing.

SAN

KD

Dust Seal Collar, Saod Or Saodd Pillow Block.

SAN

WD

Dust Seal Collar, Saod Or Saodd Pillow Block.

SAO

ž

Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Unit Series Muob) , Single Labyrinth Sealed External Selfaligning Bearing.

SAOD

ž

Pillow Block Designation, Same As Sao Except Furnished With Dust Seal Collar.

SAODD

ž

Pillow Block Designation, Same As Sao And Saod Except Furnished With Dust Seal Collar And Rear Dust Seal.

SAOL

ž

Same As Sal Series Except For Heavier Section.

SCS

ž

Countershaft Box Unit (Replacement Bearing Unit Series Mub) .

SM

ž

Power Transmission Bearing, Single-Row, External Self-Aligning With Aligning Ring, Wide Inner Ring With Eccentric Locking Collar.

SM

B

Industrial Power Transmission Bearing, Single-Row, External Selfaligning, Wide Inner Ring With Eccentric Locking Collar, Single Labyrinth Seal .

SM

K

Power Transmission Bearing, Single-Row, Radial, Wide Inner Ring, With Eccentric Locking Collar.

SM

KB

Power Transmission Bearing, Single-Row, External Self-Aligning, Wide Inner Ring With Eccentric Locking Collar.

SMN

ž

Bearing Same As For Sm Except Bearing Is 300 Series.

SMN

ž

Power Transmission Bearing, Single-Row, External Self-Aligning With Aligning Ring, Wide Inner Ring With Eccentric Locking Collar, Heavy Series (No Suffix) .

SMN

A

Replacement Bearing For Dsao And Dsaodd Series Pillow Blocks.

SMN

B

Power Transmission Bearing, Single Row, External Self-Aligning, Single Labyrinth Seal, Wide Inner Ring With Eccentric Locking Collar.

SMN

K

Power Transmission Bearing, Single-Row, Radial, Wide Inner Ring With Eccentric Locking Collar, Heavy Series.

SMN

KB

Power Transmission Bearing Single-Row, External Self-Aligning, Wide Inner Ring With Eccentric Locking Collar, Heavy Series.

SMO

ž

Similar To Smn Except Longer Inner Ring, Old Designation.

SN

H

Eccentric Locking Collar.

SN

HD

Dust Seal Collar, Pillow Block.

SN

K

Eccentric Locking Collar. For Wide Inner Ring Power Transmission Bearing (E.G. Sn103K).

SN

KD

Dust Seal Collar, Pillow Block.

SN

WD

Dust Seal .Collar.

SNW

ž

Adapter Sleeve, Locknut, And Lockwasher.

T

ž

Rear Dust Seal When Followed By Shaft Size (E.G. T-13143 X 1-7/16 Inches) .

T

ž

Stamped On Box Only, Indicates Tight Internal Fit-Up.

T

D

Housing, Pillow Block With Dust Seal Collar.

TU

ž

Take-Up Unit Frame, Cast Iron.

W

ž

Wide Type Plya-Seal Bearing.

WIR

ž

Single-Row Bearing, Inner Ring Extended On One Side To Double-Row Width.

Y

ž

Aircraft Special Helicopter Bearings.

Y

FWI (DB)

Aircraft Bearing, Medium Duty, Retainer Type, Duplex (Db) , Plya-Seal (E.G. Y96Pwidb) .

ž

-4

Any Bearing Number Followed By A Dash And Another Single Digit Indicates A Bearing Differing From Standard (As Represented By The Bearing Number Proper) In One Respect Or Another.

ž

-3

Any Bearing Number Followed By A Dash And Another Single Digit Indicates A Bearing Differing From Standard (As Represented By The Bearing Number Proper) In One Respect Or Another.

ž

-2

Any Bearing Number Followed By A Dash And Another Single Digit Indicates A Bearing Differing From Standard (As Represented By The Bearing Number Proper) In One Respect Or Another.

ž

A

Medium Duty Aircraft Type.

ž

A

Narrow Series Type.

ž

A

Original Maximum (Filling Slot Type) (Obsolete On Most Sizes) (Superseded By W) .

ž

AK

Lower Torque Retainer Type, Aircraft Series (E.G. Aw5Ak) .

ž

B

Spherical O.D.

ž

BF

Wide Inner Ring Bearing, Beveled O.D., Felt Seals.

ž

BR

Bronze Retainer, Stamped On Box Only.

ž

BS

External Self-Aligning Aircraft Torque Tube Type (E.G. Kp25Bs)

ž

BT

Special Caterpillar Replacement.

ž

CL, 2,

Denotes Latest Internal Construction Change, Overall Dimensions

ž

CN

Special Bearing, Chicago Pneumatic Tool.

ž

CR

Stamped On Box Only To Designate Composition Retainer.

ž

D

Steel Plate Grease Shield On One Side Of Bearing.

ž

DB

Duplex Back-To-Back.

ž

DD

Steel Plate Grease Shield On Both Sides Of Bearing.

ž

DDG

Double Shield, Snap Ring And Groove On O.D. Of Outer Ring.

ž

DF

Duplex Face-To-Face.

ž

DG

Single Shield, Snap Ring And Groove On O.D. On Side Opposite Shield.

ž

DT

Duplex Tandem.

ž

DU

Duplex Universal Flush Ground For Mounting Db, Df, Or Dt.

ž

DUH

Duplex Universal, Heavy Deload.

ž

DUL

Duplex Universal, Light Deload.

ž

DUM

Duplex Universal, Medium Deload.

ž

E

(Followed By Four Digit Numeral) Customer Specification.

ž

F

Synthetic Rubber And Felt Washer, Incorporated On Integral Part Of Mechani-Seal On Wide Inner Ring Bearings.

ž

FT

Full Type (Without A Retainer) .

ž

G

Snap Ring And Groove On O.D. Of Outer Ring.

ž

GE

Suffix For Few Narrow Series.

ž

H

Heavy Aircraft Series.

ž

K

Latest Conrad (Non-Filling Slot) Type.

ž

KD

Conrad Type, Single Shield.

ž

KDD

Conrad Type, Double Shielded.

ž

KI

Also Aircraft Helicopter Bearing.

ž

KL

Industrial Power Transmission Ball Bearing, Wide Inner Ring, Single Seal .

ž

KL

Conrad Construction, Single Mechani-Seal.

ž

KLB

Industrial Power Transmission Ball Bearing, Wide Inner Ring, Single Seal, External Self-Aligning.

ž

KLD

Conrad Construction, Single Mechani-Seal, Single Shield.

ž

KLL

Industrial Transmission Bearing, Wide Inner Ring, Double Seal.

ž

KLL

Conrad Construction, Double Mechani-Seal.

ž

KT

Wide Inner Type To Denote Change In Outer Ring Size From Original Design.

ž

KT

Single Felt Seal, Conrad Construction.

ž

KTD

Conrad Construction, One Felt Seal, One Shield.

ž

KTT

Double Felt Seal, Conrad Construction.

ž

KVL

Conrad Construction, Single Mechani-Seal.

ž

KVLD

Conrad Construction, Single Mechani-Seal, Single Shield.

ž

KVLL

Conrad Construction, Double Mechani-Seal.

ž

KVT

Single Felt Seal, Conrad Construction.

ž

KVTD

Conrad Construction, Single Felt Seal, Single Shield.

ž

L

Left-Handed Thread, Rod-End Type.

ž

L

Mechani-Seal On One Side Of Single-Row Radial And Wide Inner Ring Bearings .

ž

LD

Mechani-Sealed On One Side, Plate Shield On Other.

ž

LF

Mechani-Sealed One Side With Felt Or Composition Between Seal Members.

ž

LL

Mechani-Seals Both Sides Of Bearing, Radial And Wide Inner Type.

ž

LLF

Mechani-Seals Both Sides Of Bearing With Felt Or Composition Between Seal Members.

ž

LLG

Double Mechani-Seal, Snap Ring And Groove On O.D. Of Outer Ring.

ž

M

Male Shank, Rod-End Type.

ž

MBR

Machined Bronze Retainer (Stamped On Box Only) .

ž

MS

Stamping Size Designation, Flangette Unit.

ž

MSR

Machined Steel Retainer (Stamped On Box Only) .

ž

N

One Shielded Bearings Closer Fitting Grease Shield With More Land On Bearing Face.

ž

N

6000 Series. Old American Width In Inches. (Note: 6000 Series Without Suffix "N" Is European Metric Width) .

ž

N

Double Row Bearings, 5000 Series. Old American, Narrow Width Prior To Sae Standards. (Note: 5000 Series Without Suffix "N" Is Present Sae Standard Width) .

ž

NP

Single Non-Removable Plya-Seal.

ž

NPP

Two Non-Removable Plya-Seals.

ž

P

Plya-Seal On One Side Of Bearing.

ž

PP

Plya-Seal On Both Sides Of Bearing.

ž

PW

Extra Duty Radial, Thrust Type 7000 Series.

ž

R

Right-Hand Thread Rod-End Type.

ž

S

Solid Shank, Rod-End Type.

ž

S

External Self-Aligning Type, Spherical Surface On The O.D. Is Matched With An Internal Spherical Surface Of An Extra Ring Having A Straight Or Flat O.D. Used To Designate Single- And Double-Row And Wide Inner Ring Bearings.

ž

SMBR

Silicon, Machined Bronze Retainer.

ž

SR

Steel Retainer.

ž

T

Felt Seal On One Side Of Bearing.

ž

TD

Single Seal And Shield.

ž

TG

Single Felt Seal, Snap Ring And Groove On O.D. Of Outer Ring On Side Opposite Seal.

ž

TT

Felt Seal On Both Sides Of Bearing.

ž

W

(Followed By Numeral) Width Of Inner Ring In Sixteenths, Bell Crank Type.

ž

W

20 Degree Angle In Smaller Sizes, 7200 And 7300 Series.

ž

W

Latest Maximum Capacity (Filling Slot) Type.

ž

WD

Loading Groove Construction, Single Shield Face Opposite Groove.

ž

WI

Maximum Type (W) Counterbored On Outer Ring.

ž

WP

7000 Series With 35 Degree Contact Angle, Same Note As For Wi (Superseded By 7000Pw Series).

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Fafnir® is a registered trademark of The Timken Company.

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