Original catalogue drawing - Timken TRB Catalog, page 642
Scanned from the manufacturer catalogue page listing this part number. All part numbers printed on that table share the same drawing.
Scale cross-section
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)
Symbol
Dimension
mm
inch
d
Bore diameter
209.55
8.25
D
Outside diameter
317.5
12.5
B
Inner-ring / bearing width
184.15
7.25
T
Overall assembly width
184.15
7.25
r
Chamfer (min)
3.3
0.1299
Notes
Tapered roller bearings are cone / cup assemblies; cone and cup weights are listed separately and the total is their sum. 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)
209.550
Bore d (in)
8.2500
Outside dia. D (mm)
317.500
Outside dia. D (in)
12.5000
Width B (mm)
184.150
Width B (in)
7.2500
Overall width T (mm)
184.150
Overall width T (in)
7.2500
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
270000
Basic dynamic load rating Cr (N)
1200000
Dynamic rating C1 (N, ISO)
1200000
Dynamic rating C1 (lbf, ISO)
270000
Radial rating C90 (N)
179000
Radial rating C90 (lbf)
40200
Thrust rating Ca90 (N)
160000
Thrust rating Ca90 (lbf)
36100
Factor e
0.52
Factor Y1
1.29
Factor Y2
1.92
Factor K
1.12
Geometry factor G1
912.5
Geometry factor G2
126.1
Geometry factor Cg
0.1460
Weight
Weight (kg)
45.37
Mounting dimensions (fillets / shoulders)
Shaft fillet R max (mm)
1.5
Housing fillet r max (mm)
3.3
Housing shoulder Db (mm)
286.0
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
300,000
102
3,386
6
200,000
392
13,083
8
150,000
1,024
34,133
10
120,000
2,154
71,814
15
80,000
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 1,200,000 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) are not included.
Source & traceability
Brand
Timken
Source catalogue
Timken Tapered Roller Bearing Catalog (2016)
Catalogue page
p.642 (dimensions)
Series type
TDIT
ISO dynamic rating C1, Timken C90 / Ca90, static rating C0, geometry factors and assembly weight.
Send us the quantity you need and we will come back with price and
lead time, normally within 24 hours. Equivalent parts from other brands can be quoted at the same time.
