Original catalogue drawing - Timken TRB Catalog, page 570
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
187.325
7.375
D
Outside diameter
320.675
12.625
T
Overall assembly width
185.738
7.3125
C
Cup / outer-ring width
138.112
5.4375
r
Chamfer (min)
1.5
0.0591
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)
187.325
Bore d (in)
7.3750
Outside dia. D (mm)
320.675
Outside dia. D (in)
12.6250
Overall width T (mm)
185.738
Overall width T (in)
7.3125
Cup width C (mm)
138.112
Cup width C (in)
5.4375
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
410000
Basic dynamic load rating Cr (N)
1830000
Dynamic rating C1 (N, ISO)
1830000
Dynamic rating C1 (lbf, ISO)
410000
Radial rating C90 (N)
272000
Radial rating C90 (lbf)
61100
Thrust rating Ca90 (N)
148000
Thrust rating Ca90 (lbf)
33400
Factor e
0.32
Factor Y1
2.12
Factor Y2
3.15
Factor K
1.83
Geometry factor G1
905.7
Geometry factor G2
90.3
Geometry factor Cg
0.1242
Weight
Weight (kg)
53.16
Mounting dimensions (fillets / shoulders)
Shaft fillet R max (mm)
5.5
Housing fillet r max (mm)
1.5
Shaft shoulder db (mm)
214.0
Housing shoulder Da (mm)
301.0
Pin dimension Ka (mm)
28.58
Pin dimension Kb (mm)
10.31
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
457,500
102
3,386
6
305,000
392
13,083
8
228,750
1,024
34,133
10
183,000
2,154
71,814
15
122,000
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 1,830,000 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.570 (dimensions)
Series type
TDO
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.
