SIFT BEARING STORE CATALOG

K3780-3720FAGTapered Roller

K3780-3720 is a FAG tapered roller bearing, bore 50.8 mm, O.D. 93.26 mm, width 30.3 mm. Dimensions, drawing, interchanges and price.

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Bore d50.8mm
Outside dia. D93.26mm
Width B30.3mm
Dynamic Cr104kN
Static C0r137kN
Limiting speed7,700rpm
Weight0.89kg
Cr / C0r0.76
Mean dia. dm72mm

Original catalogue drawing - FAG Schaeffler HR 1, page 620

K3780-3720 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. D93.26 mmBore d50.8 mmWidth B30.3 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 diameter50.82
DOutside diameter93.2643.6718
BInner-ring / bearing width30.3021.193
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)50.8
Outside dia. D (mm)93.264
Width B (mm)30.302
Overall width T (mm)30.162
Cup width C (mm)23.812
Inner-ring OD d1 (mm)72.3

Load ratings & speeds

Basic dynamic load rating Cr (lbs)23380
Basic static load rating Cor (lbs)30799
Basic dynamic load rating Cr (N)104000
Basic static load rating C0r (N)137000
Basic dynamic axial rating Ca (N)3.5
Fatigue limit load Cur (N)17000
Factor e0.34
Factor Y1.77
Factor Y00.97
Limiting speed nG (rpm)7,700
Effective load centre a (mm)22

Weight

Weight (kg)0.89

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)3.6
Shaft shoulder da (mm)58
Shaft shoulder db (mm)64
Housing shoulder Da (mm)82
Housing shoulder Db (mm)88
Housing fillet ra max (mm)3.6
Fillet rb max (mm)3.3

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 2,500 rpm
426,000102677
617,3333922,617
813,0001,0246,827
1010,4002,15414,363
156,9338,32355,490

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 104,000 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.620 (dimensions)

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

Interchange - same dimensions, other brands

DesignationBrandTypedDB/TDyn. ratingkg
3775/3720TimkenTapered Roller50.893.2630.3122 kN0.86
3780/3720TimkenTapered Roller50.893.2630.3122 kN0.85
3780/3730TimkenTapered Roller50.893.2630.3122 kN0.86
3784/3720TimkenTapered Roller50.893.2630.3122 kN0.83

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
K33889-33822FAGTapered Roller50.895.2528.57107 kN0.861
K368-362-AFAGTapered Roller50.888.922.2372 kN0.516
K368-A-362-AFAGTapered Roller50.888.922.2372 kN0.555
K45284-45220FAGTapered Roller50.8104.7830.96126 kN1.25
K4580-4535FAGTapered Roller50.8104.7840.16159 kN1.67
K537-532-XFAGTapered Roller50.8107.9536.96146 kN1.69
K72200-72487FAGTapered Roller50.8123.8332.79135 kN2.18
KHM807046-HM807010FAGTapered Roller50.8104.7836.51145 kN1.64

Request a quotation for K3780-3720

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