25580/25520NSKTapered Roller

Name: NSK 25580/25520 Tapered Roller Bearing
Brand: NSK
SKU: 25580/25520

25580/25520 is a NSK tapered roller bearing, bore 44.45 mm, O.D. 82.93 mm, width 25.4 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d44.45mm

Outside dia. D82.93mm

Width B25.4mm

Dynamic Cr17,200lbs

Static C0r22,200lbs

Weight0.54kg

Cr / C0r0.77

Mean dia. dm63.7mm

Original catalogue drawing - NSK catalogue, page 135

25580/25520 NSK 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	44.45	1.75
D	Outside diameter	82.931	3.265
B	Inner-ring / bearing width	25.4	1
T	Overall assembly width	23.812	0.9375
C	Cup / outer-ring width	19.05	0.75
r	Chamfer (min)	3.556	0.14

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)	44.450
Bore d (in)	1.7500
Outside dia. D (mm)	82.931
Outside dia. D (in)	3.2650
Width B (in)	1.0000
Overall width T (mm)	23.812
Overall width T (in)	0.9375
Cup width C (in)	0.7500

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	17200
Basic static load rating Cor (lbs)	22200
Effective centre a (in)	0.69

Weight

Cone weight (kg)	0.354
Cup weight (kg)	0.186
Total weight (kg)	0.54

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.14
Chamfer r1 (in)	0.03
Shaft shoulder da min (in)	2.91
Shaft shoulder da (in)	1.97
Housing shoulder Da (in)	3.03

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	19,127	102	3,386
6	12,752	392	13,083
8	9,564	1,024	34,133
10	7,651	2,154	71,814
15	5,101	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 76,509 N. Hours = L₁₀ x 10⁶ / (60n). Life-modification factors for lubrication, contamination and temperature (a_ISO) are not included.

Source & traceability

Brand	NSK
Source catalogue	NSK inch product catalogue
Catalogue page	p.137 (dimensions) / p.138 (ratings)

Dimensions in inches and millimetres, load ratings in lbs.

Interchange - same dimensions, other brands

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
K25581-25520	FAG	Tapered Roller	44.45	82.93	25.4	81 kN	0.561
25580/25520	Timken	Tapered Roller	44.45	82.93	25.4	90.5 kN	0.56
25580/25523	Timken	Tapered Roller	44.45	82.93	25.4	90.5 kN	0.6
25580/25524	Timken	Tapered Roller	44.45	82.93	25.4	90.5 kN	0.56
25581/25520	Timken	Tapered Roller	44.45	82.93	25.4	90.5 kN	0.56
25582/25520	Timken	Tapered Roller	44.45	82.93	25.4	90.5 kN	0.55

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
3578/3525	NSK	Tapered Roller	44.45	87.31	30.89	21,600 lbs	0.776
3782/3720	NSK	Tapered Roller	44.45	93.26	30.3	23,200 lbs	0.957
HR30209C	NSK	Tapered Roller	45	85	19	14,200 lbs	0.476
HR30209J	NSK	Tapered Roller	45	85	19	15,400 lbs	0.49
HR30210	NSK	Tapered Roller	45	90	20	94 kN	0.557
HR30309	NSK	Tapered Roller	45	100	25	138 kN	1.01
HR30309C	NSK	Tapered Roller	45	100	25	23,200 lbs	0.984
HR30309J	NSK	Tapered Roller	45	100	25	25,200 lbs	1.012

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