2578/2520 is a Timken tapered roller bearing, bore 28.57 mm, O.D. 66.42 mm, width 25.36 mm, weight 0.43 kg. Dimensions, drawing, interchanges and price.
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
28.575
1.125
D
Outside diameter
66.421
2.615
B
Inner-ring / bearing width
25.357
0.9983
T
Overall assembly width
25.4
1
C
Cup / outer-ring width
20.638
0.8125
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)
28.575
Bore d (in)
1.1250
Outside dia. D (mm)
66.421
Outside dia. D (in)
2.6150
Width B (mm)
25.357
Width B (in)
.9983
Overall width T (mm)
25.400
Overall width T (in)
1.0000
Cup width C (mm)
20.638
Cup width C (in)
.8125
Weight
Cone weight (kg)
0.31
Cup weight (kg)
0.12
Total weight (kg)
0.43
Mounting dimensions (fillets / shoulders)
Shaft fillet R max (mm)
2.3
Housing fillet r max (mm)
3.3
Source & traceability
Brand
Timken
Source catalogue
Timken Bearing Dimension Catalog
Catalogue page
p.303 (dimensions) / p.49 (cone) / p.23 (cup)
Dimensions and component weights only - this catalogue publishes no load ratings or speeds.
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.
