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Fafnir Ball Bearings - Products & Interchange

Fafnir Ball Bearings Supplier

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 quite a number of companies including Textron, Inc., The Torrington Company (which was owned by Ingersoll Rand), and The Timken Company.

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Bearings Catalog

Check out our online product catalog with more than 10,000 products with full specifications & 3D CAD Models available for download - all free of charge!

Fafnir Ball Bearing Product Range 

Today, Fafnir 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 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

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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 Fafnir ball bearing part numbering system.  If you would like assistance understanding the Fafnir ball bearing part numbering system, contact us.

PrefixSuffixDefinition
0?Super-Quiet Series.
2?12 Degree Contact Angle In Radially Fitted Bearings.
3?25 Degree Contact Angle In Radially Fitted Bearings.
2MM?Abec-7 Precision, 12 Degree Contact Angle.
3MM?Abec-7 Precision, 25 Degree Contact Angle.
A?Stainless Steel.
AA?Any Steel Other Than 52100 And 440C Stainless.
B?Aircraft Torque Tube Type (E.G. B542).
BCP?Bellcrank Type Aircraft Bearing, Plya-Seals (E.G. Bcp4W10) .
CO?Cylindrical Cartridge Unit - (Replacement Bearing Unit Series Muob) .
DRTrack Roller Type, Aircraft Bearing (E.G. D7R6-2) .
DF?Aircraft Double-Row.
DPP?Aircraft, Double-Row, Plya-Seal Type.
DR?Double Row Industrial Roller Bearings.
DRN?Double Rigid Pillow Block.
DSA?Standard Series Double Pillow Block, Two Wide Inner Ring Bearings With Locking Collars, Each Bearing Single Labyrinth Sealed (Replacement Bearing Unit Series Mua) .
DSADD?Same As Dsa Series Except Furnished With Dust Seal Collars.
DSAO?Same As Dsa Series Except Heavy Series (Replacement Bearing Unit Series Muoa) .
DSAODD?Same As Dsadd Series Except Heavy Series (Replacement Bearing Unit Series Muoa) .
DSP?Double Row Self-Aligning Aircraft Bearing, Plya-Seal, Pre-Lubricated.
DSRP?Aircraft Self-Aligning Roller With Plya-Seals.
DW?Aircraft, Wide, Double-Row.
F?Flanged Outer Ring, Mostly Small Instrument Sizes.
FL?Aircraft Fairlead Bearings.
G?Relubricatable Mechani-Seal, Wide Inner Ring Bearing.
G?Aircraft Guide Roll.
GKLLDouble Mechani-Seal Wide Inner Ring Power Transmission Bearing, With
GKLLBDouble Mechani-Seal Wide Inner Ring Power Transmission Bearing, With
GYPush Pull Type Guide Bearing (E.G. G4Y17) .
GD?Aircraft Guide Roll.
GN?Heavy Series, Relubricatable, Wide Inner Ring, Mechani-Seal Bearings.
H?Stamped On Box Only, Designates Snug Internal Fit-Up.
J?Extra Loose Internal Fit.
KA?Aircraft Aero Seal Type.
KF?Aircraft Single Row, Originally Felt Seals, Now Plya-Seals, Same Designation.
KP?Aircraft Single Row Plya-Seal.
KPAFull Type Aircraft Bearing, Plya-Seal, Prelubricated, Medium Duty (E.G.
KPARTrack Roller Type Aircraft Bearing (E.G. Kp3Ar11-2) .
KPBFull Type Aircraft Bearing, Medium Duty, Plya-Seal, Prelubricated (E.G. Kp37B) .
KS?Aircraft, Single-Row, Self-Aligning.
KSLSelf-Aligning Aircraft Bearing, Metal Shield, Prelubricated (E.G. Ks3L) .
L?Internal Self-Aligning Type.
LAK?Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Series G-Kllb) , Double Mechani-Seal, External Self-Aligning Bearing.
LAO?Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Series Gn-Kllb) , Double Mechani-Seal, External Self-Aligning Bearing.
LC?Cylindrical Cartridge Unit (Replacement Bearing Series G-Kllb) .
LCJ?Flange Cartridge Unit, (Replacement Bearing Series G-Kllb) .
LCJO?Same As Lcj Except Heavy Series (Replacement Bearing Series (G-Kllb)
LM?L Means Dovetail Or Undercut Cam On Wide Inner Bearings. The "M" Means Closer Bore Tolerances Now Standard.
LP?Special Wide Inner Bearing, Proctor And Schwartz.
LTU?Take-Up Unit, (Replacement Bearing Series G-Kllb) .
M?Abec-3 Tolerance.
MFS60000Abec-5 Bearing, (Last Four Digits Of Fs Suffix Are For Customer Specification) .
MC?Motor Cartridge Unit (Replacement Bearing Unit Muoa) .
MM?Super-Precision Type Manufactured To Meet Abec-7 Specification.
MUA?Replacement Bearing Unit For Dsa-Dsadd Pillow Blocks.
MUB?Replacement Bearing Unit For Sa-Sad-Sadd Type Pillow Blocks.
MUOB?Replacement Bearing Unit For Sao, Saod, And Saodd Pillow Blocks.
MV?Abec-7 Modified.
N?Heavy Series, Non-Relubricatable Wide Inner Ring Mechani-Seal Bearings.
NKLLIndustrial Power Transmission Bearing, Double Sealed, Wide Inner Ring. With Eccentric Locking Collar.
NKLLBIndustrial Power Transmission Bearing, Double Sealed, Wide Inner Ring With Eccentric Locking Collar, External Self-Aligning.
NLTU?Take-Up Unit Frame, Pressed Steel For Side Mounting.
P?Aircraft Special Pulley Bearings.
P?Stamped On Box Only, Indicates Loose Internal Fit-Up.
PSMSReplacement Bearing For Sal Pillow Block.
PSMTSReplacement Bearing For Sal Pillow Block.
R?Regular Fit-Up.
R?Single Cage Roller Bearing.
RA?Extended Inner Ring Series With Collar.
RB?Double Shielded Relubricatable Wide Inner Ring Bearings Used In Rubber Pillow Block.
RBG?Rubber Pillow Block With Provision For Relubrication.
RBGF?Rubber Flange Cartridge Unit.
RBGU?Same As Rbg Except Furnished With Corrosion-Resistant Steel Strap
RE?Aircraft Rod-End Bearing.
REB?Rod-End Type.
REP?Precision Aircraft Rod-Ends.
RS?Rubber Pillow Block, No Provision For Relubrication.
RSC?Rubber Cylindrical Cartridge Unit.
RSU?Same As Rs Except Furnished With Corrosion-Resistant Steel Strap.
S?Known As Aerolite Type For Aircraft Service, Few Special Aircraft Sizes.
S?Small Inch Dimensions Sizes.
SHDDust Seal Collar, Sadd Pillow Block.
SKCollar, Wide Inner Power Transmission Bearing (E.G. S1113K) .
SKDDust Seal Collar, Sadd Series Pillow Block.
SKTEccentric Locking Collar For Wide Inner Ring Bearing (E.G. Sll08Kt).
SKTDDust Seal Collar, Sadd Pillow Block.
SWDDust Seal Collar, Saod Or Saodd Pillow Block.
SA?Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Unit Mub Series) Single Labyrinth Sealed External Self-Aligning Bearing.
SAKDDust Seal Collar Only For Sadd Pillow Block.
SAWDDust Seal Collar, Sadd Series Pillow Block.
SAD?Pillow Block Designation, Same As Sa Series Except Furnished With Dust Seal Collar.
SADD?Pillow Block Designation, Same As Sa And Sad Except Furnished With Dust Seal Collar And Rear Dust Seal .
SAL?Direct Mounted Ball Bearing Pillow Block (Replacement Bearing Series Psm-S Or Psm-Ts) , Furnished Fixed Or Floating, External Self-Aligning Bearing.
SANKDDust Seal Collar, Saod Or Saodd Pillow Block.
SANWDDust Seal Collar, Saod Or Saodd Pillow Block.
SAO?Direct Mounted Ball Bearing Pillow Block Series Designation (Replacement Bearing Unit Series Muob) , Single Labyrinth Sealed External Selfaligning Bearing.
SAOD?
SAODD?Pillow Block Designation, Same As Sao Except Furnished With Dust Seal Collar.
SAOL?Same As Sal Series Except For Heavier Section.
SCS?Countershaft Box Unit (Replacement Bearing Unit Series Mub) .
SM?Power Transmission Bearing, Single-Row, External Self-Aligning With Aligning Ring, Wide Inner Ring With Eccentric Locking Collar.
SMBIndustrial Power Transmission Bearing, Single-Row, External Selfaligning, Wide Inner Ring With Eccentric Locking Collar, Single Labyrinth Seal .
SMKPower Transmission Bearing, Single-Row, Radial, Wide Inner Ring, With Eccentric Locking Collar.
SMKBPower Transmission Bearing, Single-Row, External Self-Aligning, Wide Inner Ring With Eccentric Locking Collar.
SMN?Bearing Same As For Sm Except Bearing Is 300 Series.
SMN?Power Transmission Bearing, Single-Row, External Self-Aligning With Aligning Ring, Wide Inner Ring With Eccentric Locking Collar, Heavy Series (No Suffix) .
SMNAReplacement Bearing For Dsao And Dsaodd Series Pillow Blocks.
SMNBPower Transmission Bearing, Single Row, External Self-Aligning, Single Labyrinth Seal, Wide Inner Ring With Eccentric Locking Collar.
SMNKPower Transmission Bearing, Single-Row, Radial, Wide Inner Ring With Eccentric Locking Collar, Heavy Series.
SMNKBPower Transmission Bearing Single-Row, External Self-Aligning, Wide Inner Ring With Eccentric Locking Collar, Heavy Series.
SMO?Similar To Smn Except Longer Inner Ring, Old Designation.
SNHEccentric Locking Collar.
SNHDDust Seal Collar, Pillow Block.
SNKEccentric Locking Collar. For Wide Inner Ring Power Transmission Bearing (E.G. Sn103K).
SNKDDust Seal Collar, Pillow Block.
SNWDDust Seal .Collar.
SNW?Adapter Sleeve, Locknut, And Lockwasher.
T?Rear Dust Seal When Followed By Shaft Size (E.G. T-13143 X 1-7/16 Inches) .
T?Stamped On Box Only, Indicates Tight Internal Fit-Up.
TDHousing, Pillow Block With Dust Seal Collar.
TU?Take-Up Unit Frame, Cast Iron.
W?Wide Type Plya-Seal Bearing.
WIR?Single-Row Bearing, Inner Ring Extended On One Side To Double-Row Width.
Y?Aircraft Special Helicopter Bearings.
YFWI (DB)Aircraft Bearing, Medium Duty, Retainer Type, Duplex (Db) , Plya-Seal (E.G. Y96Pwidb) .
?-4Any 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.
?-3Any 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.
?-2Any 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.
?AMedium Duty Aircraft Type.
?ANarrow Series Type.
?AOriginal Maximum (Filling Slot Type) (Obsolete On Most Sizes) (Superseded By W) .
?AKLower Torque Retainer Type, Aircraft Series (E.G. Aw5Ak) .
?BSpherical O.D.
?BFWide Inner Ring Bearing, Beveled O.D., Felt Seals.
?BRBronze Retainer, Stamped On Box Only.
?BSExternal Self-Aligning Aircraft Torque Tube Type (E.G. Kp25Bs)
?BTSpecial Caterpillar Replacement.
?CL, 2,Denotes Latest Internal Construction Change, Overall Dimensions
?CNSpecial Bearing, Chicago Pneumatic Tool.
?CRStamped On Box Only To Designate Composition Retainer.
?DSteel Plate Grease Shield On One Side Of Bearing
?DBDuplex Back-To-Back.
?DDSteel Plate Grease Shield On Both Sides Of Bearing.
?DDGDouble Shield, Snap Ring And Groove On O.D. Of Outer Ring.
?DFDuplex Face-To-Face.
?DGSingle Shield, Snap Ring And Groove On O.D. On Side Opposite Shield.
?DTDuplex Tandem.
?DUDuplex Universal Flush Ground For Mounting Db, Df, Or Dt.
?DUHDuplex Universal, Heavy Deload.
?DULDuplex Universal, Light Deload.
?DUMDuplex Universal, Medium Deload.
?E(Followed By Four Digit Numeral) Customer Specification.
?FSynthetic Rubber And Felt Washer, Incorporated On Integral Part Of Mechani-Seal On Wide Inner Ring Bearings.
?FTFull Type (Without A Retainer) .
?GSnap Ring And Groove On O.D. Of Outer Ring.
?GESuffix For Few Narrow Series.
?HHeavy Aircraft Series.
?KLatest Conrad (Non-Filling Slot) Type.
?KDConrad Type, Single Shield.
?KDDConrad Type, Double Shielded.
?KIAlso Aircraft Helicopter Bearing.
?KLIndustrial Power Transmission Ball Bearing, Wide Inner Ring, Single Seal .
?KLConrad Construction, Single Mechani-Seal.
?KLBIndustrial Power Transmission Ball Bearing, Wide Inner Ring, Single Seal, External Self-Aligning.
?KLDConrad Construction, Single Mechani-Seal, Single Shield.
?KLLIndustrial Transmission Bearing, Wide Inner Ring, Double Seal.
?KLLConrad Construction, Double Mechani-Seal.
?KTWide Inner Type To Denote Change In Outer Ring Size From Original Design.
?KTSingle Felt Seal, Conrad Construction.
?KTDConrad Construction, One Felt Seal, One Shield.
?KTTDouble Felt Seal, Conrad Construction.
?KVLConrad Construction, Single Mechani-Seal.
?KVLDConrad Construction, Single Mechani-Seal, Single Shield.
?KVLLConrad Construction, Double Mechani-Seal.
?KVTSingle Felt Seal, Conrad Construction.
?KVTDConrad Construction, Single Felt Seal, Single Shield.
?LLeft-Handed Thread, Rod-End Type.
?LMechani-Seal On One Side Of Single-Row Radial And Wide Inner Ring Bearings .
?LDMechani-Sealed On One Side, Plate Shield On Other.
?LFMechani-Sealed One Side With Felt Or Composition Between Seal Members.
?LLMechani-Seals Both Sides Of Bearing, Radial And Wide Inner Type.
?LLFMechani-Seals Both Sides Of Bearing With Felt Or Composition Between Seal Members.
?LLGDouble Mechani-Seal, Snap Ring And Groove On O.D. Of Outer Ring.
?MMale Shank, Rod-End Type.
?MBRMachined Bronze Retainer (Stamped On Box Only) .
?MSStamping Size Designation, Flangette Unit.
?MSRMachined Steel Retainer (Stamped On Box Only) .
?NOne Shielded Bearings Closer Fitting Grease Shield With More Land On Bearing Face.
?N6000 Series. Old American Width In Inches. (Note: 6000 Series Without Suffix "N" Is European Metric Width) .
?NDouble Row Bearings, 5000 Series. Old American, Narrow Width Prior To Sae Standards. (Note: 5000 Series Without Suffix "N" Is Present Sae Standard Width) .
?NPSingle Non-Removable Plya-Seal.
?NPPTwo Non-Removable Plya-Seals.
?PPlya-Seal On One Side Of Bearing.
?PPPlya-Seal On Both Sides Of Bearing.
?PWExtra Duty Radial, Thrust Type 7000 Series.
?RRight-Hand Thread Rod-End Type.
?SSolid Shank, Rod-End Type.
?SExternal 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.
?SMBRSilicon, Machined Bronze Retainer.
?SRSteel Retainer.
?TFelt Seal On One Side Of Bearing.
?TDSingle Seal And Shield.
?TGSingle Felt Seal, Snap Ring And Groove On O.D. Of Outer Ring On Side Opposite Seal.
?TTFelt Seal On Both Sides Of Bearing.
?W(Followed By Numeral) Width Of Inner Ring In Sixteenths, Bell Crank Type.
?W20 Degree Angle In Smaller Sizes, 7200 And 7300 Series.
?WLatest Maximum Capacity (Filling Slot) Type.
?WDLoading Groove Construction, Single Shield Face Opposite Groove.
?WIMaximum Type (W) Counterbored On Outer Ring.
?WP7000 Series With 35 Degree Contact Angle, Same Note As For Wi (Superseded By 7000Pw Series).
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