SIFT BEARING STORE CATALOG

K3994-3920FAGTapered Roller

K3994-3920 is a FAG tapered roller bearing, bore 66.67 mm, O.D. 112.71 mm, width 30.05 mm. Dimensions, drawing, interchanges and price.

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Bore d66.67mm
Outside dia. D112.71mm
Width B30.05mm
Dynamic Cr119kN
Static C0r176kN
Limiting speed6,300rpm
Weight1.31kg
Cr / C0r0.68
Mean dia. dm89.7mm

Original catalogue drawing - FAG Schaeffler HR 1, page 624

K3994-3920 FAG Tapered Roller bearing catalogue drawing

Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.

Scale cross-section

DdBOutside dia. D112.71 mmBore d66.67 mmWidth B30.05 mmCup width C23.81 mm

Blue = inner / outer ring, yellow = rolling element. Drawn to scale from this part's own dimensions for selection reference only - not a manufacturing or assembly drawing.

Dimension table (mm / inch)

SymbolDimensionmminch
dBore diameter66.6752.625
DOutside diameter112.7124.4375
BInner-ring / bearing width30.0481.183
TOverall assembly width30.1621.1875
CCup / outer-ring width23.8120.9375

Notes

Weights are given in kg. Load ratings are shown in both the original catalogue units and the converted value (1 N = 0.2248 lbf). Data is provided for selection reference only - confirm against the latest official catalogue before ordering.

Main dimensions

Bore d (mm)66.675
Outside dia. D (mm)112.712
Width B (mm)30.048
Overall width T (mm)30.162
Cup width C (mm)23.812
Inner-ring OD d1 (mm)89

Load ratings & speeds

Basic dynamic load rating Cr (lbs)26752
Basic static load rating Cor (lbs)39566
Basic dynamic load rating Cr (N)119000
Basic static load rating C0r (N)176000
Basic dynamic axial rating Ca (N)4
Fatigue limit load Cur (N)22000
Factor e0.4
Factor Y1.49
Factor Y00.82
Limiting speed nG (rpm)6,300
Effective load centre a (mm)27

Weight

Weight (kg)1.31

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)5.6
Shaft shoulder da (mm)74
Shaft shoulder db (mm)84
Housing shoulder Da (mm)99
Housing shoulder Db (mm)106
Housing fillet ra max (mm)5.6
Fillet rb max (mm)3.3

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 2,100 rpm
429,750102806
619,8333923,115
814,8751,0248,127
1011,9002,15417,099
157,9338,32366,059

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 119,000 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) are not included.

Source & traceability

BrandFAG
Source catalogueFAG / Schaeffler Rolling Bearings HR 1
Catalogue pagep.624 (dimensions)

Load ratings in newtons, fatigue limit load Cur, limiting speed nG and reference speed nB.

Interchange - same dimensions, other brands

DesignationBrandTypedDB/TDyn. ratingkg
3984/3920NSKTapered Roller66.67112.7130.0527,000 lbs1.148
3984/3919RBTimkenTapered Roller66.67112.7130.05-1.12
3984/3920TimkenTapered Roller66.67112.7130.05139 kN1.15
3984/3925TimkenTapered Roller66.67112.7130.05139 kN1.16
3984/3926TimkenTapered Roller66.67112.7130.05139 kN1.23
3994/3920TimkenTapered Roller66.67112.7130.05139 kN1.15
3994/3925TimkenTapered Roller66.67112.7130.05139 kN1.16
3994/3926TimkenTapered Roller66.67112.7130.05139 kN1.23

Same dimensions, same brand

DesignationBrandTypedDB/TDyn. ratingkg
K3984-3920FAGTapered Roller66.67112.7130.05119 kN1.31

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
K395-A-394-AFAGTapered Roller66.671102286 kN0.855
K395-S-394-AFAGTapered Roller66.671102286 kN0.801
K39590-39520FAGTapered Roller66.67112.7130.16137 kN1.2
K3984-3920FAGTapered Roller66.67112.7130.05119 kN1.31
KH414242-H414210-XLFAGTapered Roller66.67136.5341.27270 kN2.77
KHM212049-HM212010FAGTapered Roller66.67122.2438.35193 kN1.93
KHM212049-HM212011FAGTapered Roller66.67122.2438.35193 kN1.93
AK6379-6320FAGTapered Roller65.09135.7556.01275 kN3.74

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