SIFT BEARING STORE CATALOG

31304FAGTapered Roller

31304 is a FAG tapered roller bearing, bore 20 mm, O.D. 52 mm, width 15 mm, dynamic rating 30 kN. Dimensions, drawing, interchanges and price.

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Bore d20mm
Outside dia. D52mm
Width B15mm
Dynamic Cr30kN
Static C0r29.5kN
Limiting speed14,000rpm
Weight0.174kg
Cr / C0r1.02
Mean dia. dm36mm

Original catalogue drawing - FAG Schaeffler HR 1, page 476

31304 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. D52 mmBore d20 mmWidth B15 mmCup width C11 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 diameter200.7874
DOutside diameter522.0472
BInner-ring / bearing width150.5906
TOverall assembly width16.250.6398
CCup / outer-ring width110.4331

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)20
Outside dia. D (mm)52
Width B (mm)15
Overall width T (mm)16.25
Cup width C (mm)11
Inner-ring OD d1 (mm)37.3

Load ratings & speeds

Basic dynamic load rating Cr (lbs)6744
Basic static load rating Cor (lbs)6632
Basic dynamic load rating Cr (N)30000
Basic static load rating C0r (N)29500
Basic dynamic axial rating Ca (N)3
Fatigue limit load Cur (N)3300
Factor e0.73
Factor Y0.82
Factor Y00.45
Limiting speed nG (rpm)14,000
Reference speed nB (rpm)10,100
Effective load centre a (mm)16

Weight

Weight (kg)0.174

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)1.5
Shaft shoulder da (mm)27
Shaft shoulder db (mm)27
Housing shoulder Da (mm)45
Housing shoulder Db (mm)48
Housing fillet ra max (mm)1.5
Fillet rb max (mm)1.5

Bearing life (ISO 281 basic rating life)

C / PEquivalent load P (N)L10 (106 rev)L10h at 3,000 rpm
47,500102564
65,0003922,181
83,7501,0245,689
103,0002,15411,969
152,0008,32346,241

Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 30,000 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.476 (dimensions)

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

Interchange - same dimensions, other brands

DesignationBrandTypedDB/TDyn. ratingkg
1304NSKBall2052152,810 lbs0.172
6304NSKBall2052153,580 lbs0.145
7304BNSKBall2052153,640 lbs0.15
21304CDE4NSKSpherical Roller20521529.3 kN0.17
30304NSKTapered Roller20521531 kN0.168
HR30304NSKTapered Roller20521543 kN0.172
HR30304JNSKTapered Roller2052157,870 lbs0.172
7304NSKPrecision / Angular Contact20521520.6 kN0.146
30304TimkenTapered Roller20521538.5 kN2.66

Same dimensions, same brand

DesignationBrandTypedDB/TDyn. ratingkg
1304-TVHFAGBall20521512.7 kN0.163
6304FAGBall20521516.9 kN0.151
6304-2RSRFAGBall20521516.9 kN0.155
6304-2ZFAGBall20521516.9 kN0.155
QJ304-MPAFAGBall20521530 kN0.184
QJ304-XL-MPAFAGBall20521531 kN0.184
S6304FAGBall20521516 kN0.153
NJ304-E-TVP2FAGCylindrical Roller20521536.5 kN0.156

Nearby bore sizes

DesignationBrandTypedDB/TDyn. ratingkg
30204-AFAGTapered Roller20471426.5 kN0.092
30204-XLFAGTapered Roller20471432 kN0.121
30304-AFAGTapered Roller20521534 kN0.188
32004-XFAGTapered Roller20421523.5 kN0.108
32004-X-XLFAGTapered Roller20421528.5 kN0.111
32204-B-XLFAGTapered Roller20471839 kN0.17
32204-XLFAGTapered Roller20471840.5 kN0.165
32304-AFAGTapered Roller20522145.5 kN0.241

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