Original catalogue drawing - Timken TRB Catalog, page 638
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
635
25
D
Outside diameter
939.8
37
B
Inner-ring / bearing width
304.8
12
T
Overall assembly width
304.8
12
r
Chamfer (min)
6.4
0.252
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)
635.000
Bore d (in)
25.0000
Outside dia. D (mm)
939.800
Outside dia. D (in)
37.0000
Width B (mm)
304.800
Width B (in)
12.0000
Overall width T (mm)
304.800
Overall width T (in)
12.0000
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
1790000
Basic dynamic load rating Cr (N)
7950000
Dynamic rating C1 (N, ISO)
7950000
Dynamic rating C1 (lbf, ISO)
1790000
Radial rating C90 (N)
1180000
Radial rating C90 (lbf)
266000
Thrust rating Ca90 (N)
1170000
Thrust rating Ca90 (lbf)
262000
Factor e
0.6
Factor Y1
1.2
Factor Y2
1.8
Factor K
1.01
Geometry factor G1
10936.2
Geometry factor G2
636.2
Geometry factor Cg
0.3398
Weight
Weight (kg)
738.59
Mounting dimensions (fillets / shoulders)
Shaft fillet R max (mm)
3.3
Housing fillet r max (mm)
6.4
Shaft shoulder da (mm)
684.0
Housing shoulder Db (mm)
873.0
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
1,987,500
102
3,386
6
1,325,000
392
13,083
8
993,750
1,024
34,133
10
795,000
2,154
71,814
15
530,000
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 7,950,000 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.638 (dimensions)
Series type
TDI
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.
