25578/25520DTimkenTapered Roller

Name: Timken 25578/25520D Tapered Roller Bearing
Brand: Timken
SKU: 25578/25520D

25578/25520D is a Timken tapered roller bearing, bore 42.86 mm, O.D. 82.93 mm, height 57.15 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d42.86mm

Outside dia. D82.93mm

Overall width T57.15mm

Dynamic Cr158kN

Weight1.48kg

Mean dia. dm62.9mm

Original catalogue drawing - Timken TRB Catalog, page 520

25578/25520D Timken Tapered Roller bearing catalogue drawing

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	42.862	1.6875
D	Outside diameter	82.931	3.265
T	Overall assembly width	57.15	2.25
C	Cup / outer-ring width	47.625	1.875
r	Chamfer (min)	0.8	0.0315

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)	42.862
Bore d (in)	1.6875
Outside dia. D (mm)	82.931
Outside dia. D (in)	3.2650
Overall width T (mm)	57.150
Overall width T (in)	2.2500
Cup width C (mm)	47.625
Cup width C (in)	1.8750

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	35400
Basic dynamic load rating Cr (N)	158000
Dynamic rating C1 (N, ISO)	158000
Dynamic rating C1 (lbf, ISO)	35400
Radial rating C90 (N)	23500
Radial rating C90 (lbf)	5270
Thrust rating Ca90 (N)	13500
Thrust rating Ca90 (lbf)	3020
Factor e	0.33
Factor Y1	2.02
Factor Y2	3.00
Factor K	1.74
Geometry factor G1	35.2
Geometry factor G2	14.3
Geometry factor Cg	0.0801

Weight

Weight (kg)	1.48

Mounting dimensions (fillets / shoulders)

Shaft fillet R max (mm)	2.3
Housing fillet r max (mm)	0.8
Shaft shoulder db (mm)	53.0
Housing shoulder Da (mm)	77.0

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	39,500	102	3,386
6	26,333	392	13,083
8	19,750	1,024	34,133
10	15,800	2,154	71,814
15	10,533	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 158,000 N. Hours = L₁₀ x 10⁶ / (60n). Life-modification factors for lubrication, contamination and temperature (a_ISO) are not included.

Source & traceability

Brand	Timken
Source catalogue	Timken Tapered Roller Bearing Catalog (2016)
Catalogue page	p.520 (dimensions)
Series type	TDO

ISO dynamic rating C1, Timken C90 / Ca90, static rating C0, geometry factors and assembly weight.

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
25578/25520	Timken	Tapered Roller	42.86	82.93	25.4	90.5 kN	0.58
25578/25522	Timken	Tapered Roller	42.86	83.06	25.4	90.5 kN	0.58
25578/25523	Timken	Tapered Roller	42.86	82.93	25.4	90.5 kN	0.62

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
12168/12303	Timken	Tapered Roller	42.86	76.99	17.14	49.5 kN	0.33
13169D/13318	Timken	Tapered Roller	42.86	80.96	31.75	88.5 kN	0.77
22168/22325	Timken	Tapered Roller	42.86	82.55	19.84	77.4 kN	0.44
22168/22325D	Timken	Tapered Roller	42.86	82.55	44.45	135 kN	1.01
22780/22720	Timken	Tapered Roller	42.86	82.55	26.99	92.9 kN	0.6
25576/25518	Timken	Tapered Roller	42.86	81.97	25.4	-	0.55
25576/25521	Timken	Tapered Roller	42.86	83.06	25.4	90.5 kN	0.57
29168/29334	Timken	Tapered Roller	42.86	84.99	19.16	-	0.48

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