748/743 is a Timken tapered roller bearing, bore 80 mm, O.D. 150 mm, width 46.67 mm, dynamic rating 318 kN. Dimensions, drawing, interchanges and price.
Original catalogue drawing - Timken TRB Catalog, page 276
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
80
3.1496
D
Outside diameter
150
5.9055
B
Inner-ring / bearing width
46.672
1.8375
T
Overall assembly width
44.455
1.7502
C
Cup / outer-ring width
35
1.378
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)
80.000
Bore d (in)
3.1496
Outside dia. D (mm)
150.000
Outside dia. D (in)
5.9055
Width B (mm)
46.672
Overall width T (mm)
44.455
Overall width T (in)
1.7502
Cup width C (mm)
35.000
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
71400
Basic static load rating Cor (lbs)
93800
Basic dynamic load rating Cr (N)
318000
Basic static load rating C0r (N)
417000
Dynamic rating C1 (N, ISO)
318000
Dynamic rating C1 (lbf, ISO)
71400
Radial rating C90 (N)
82400
Radial rating C90 (lbf)
18500
Thrust rating Ca90 (N)
45900
Thrust rating Ca90 (lbf)
10300
Static rating C0 (N)
417000
Static rating C0 (lbf)
93800
Factor e
0.33
Factor Y
1.84
Factor K
1.80
Geometry factor G1
159.6
Geometry factor G2
26.3
Geometry factor Cg
0.0898
Effective load centre a (mm)
-11.9
Weight
Weight (kg)
3.44
Mounting dimensions (fillets / shoulders)
Shaft fillet R max (mm)
3.0
Housing fillet r max (mm)
3.3
Shaft shoulder da (mm)
90.0
Shaft shoulder db (mm)
96.0
Housing shoulder Da (mm)
142.0
Housing shoulder Db (mm)
134.0
Cage projection Aa (mm)
1.8
Cage projection Ab (mm)
1.3
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
79,500
102
3,386
6
53,000
392
13,083
8
39,750
1,024
34,133
10
31,800
2,154
71,814
15
21,200
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 318,000 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.276 (dimensions)
Series type
TS
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.
