3578/3525NSKTapered Roller

Name: NSK 3578/3525 Tapered Roller Bearing
Brand: NSK
SKU: 3578/3525

3578/3525 is a NSK tapered roller bearing, bore 44.45 mm, O.D. 87.31 mm, width 30.89 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d44.45mm

Outside dia. D87.31mm

Width B30.89mm

Dynamic Cr21,600lbs

Static C0r26,900lbs

Weight0.776kg

Cr / C0r0.8

Mean dia. dm65.9mm

Original catalogue drawing - NSK catalogue, page 135

3578/3525 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	87.312	3.4375
B	Inner-ring / bearing width	30.886	1.216
T	Overall assembly width	30.162	1.1875
C	Cup / outer-ring width	23.812	0.9375
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)	87.312
Outside dia. D (in)	3.4375
Width B (in)	1.2160
Overall width T (mm)	30.162
Overall width T (in)	1.1875
Cup width C (in)	0.9375

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	21600
Basic static load rating Cor (lbs)	26900
Effective centre a (in)	0.79

Weight

Cone weight (kg)	0.472
Cup weight (kg)	0.304
Total weight (kg)	0.776

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.14
Chamfer r1 (in)	0.13
Shaft shoulder da min (in)	2.95
Shaft shoulder da (in)	2.01
Housing shoulder Da (in)	3.19

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	24,020	102	3,386
6	16,014	392	13,083
8	12,010	1,024	34,133
10	9,608	2,154	71,814
15	6,405	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 96,082 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
3578/3525	Timken	Tapered Roller	44.45	87.31	30.89	113 kN	0.77
3578/3526	Timken	Tapered Roller	44.45	87.31	30.89	113 kN	0.78
3578A/3525	Timken	Tapered Roller	44.45	87.31	30.89	113 kN	0.76

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
25580/25520	NSK	Tapered Roller	44.45	82.93	25.4	17,200 lbs	0.54
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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