25577/25523NSKTapered Roller

Name: NSK 25577/25523 Tapered Roller Bearing
Brand: NSK
SKU: 25577/25523

25577/25523 is a NSK tapered roller bearing, bore 42.88 mm, O.D. 82.93 mm, width 25.4 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d42.88mm

Outside dia. D82.93mm

Width B25.4mm

Dynamic Cr17,200lbs

Static C0r22,200lbs

Weight0.621kg

Cr / C0r0.77

Mean dia. dm62.9mm

Original catalogue drawing - NSK catalogue, page 135

25577/25523 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	42.875	1.688
D	Outside diameter	82.931	3.265
B	Inner-ring / bearing width	25.4	1
T	Overall assembly width	26.988	1.0625
C	Cup / outer-ring width	22.225	0.875
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)	42.875
Bore d (in)	1.6880
Outside dia. D (mm)	82.931
Outside dia. D (in)	3.2650
Width B (in)	1.0000
Overall width T (mm)	26.988
Overall width T (in)	1.0625
Cup width C (in)	0.8750

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	17200
Basic static load rating Cor (lbs)	22200
Effective centre a (in)	0.82

Weight

Cone weight (kg)	0.376
Cup weight (kg)	0.245
Total weight (kg)	0.621

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.14
Chamfer r1 (in)	0.09
Shaft shoulder da min (in)	2.83
Shaft shoulder da (in)	1.93
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
25577/25520	Timken	Tapered Roller	42.88	82.93	25.4	90.5 kN	0.58
25577/25523	Timken	Tapered Roller	42.88	82.93	25.4	90.5 kN	0.62
25578/25520	Timken	Tapered Roller	42.86	82.93	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
25580/25520	NSK	Tapered Roller	44.45	82.93	25.4	17,200 lbs	0.54
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
18590/18520	NSK	Tapered Roller	41.27	73.03	17.46	10,000 lbs	0.29
26882/26822	NSK	Tapered Roller	41.27	79.38	25.4	16,200 lbs	0.526
342/332	NSK	Tapered Roller	41.27	80	29.97	15,300 lbs	0.562
LM501349/LM501310	NSK	Tapered Roller	41.27	73.43	19.81	12,200 lbs	0.327
LM501349/LM501314	NSK	Tapered Roller	41.27	73.43	19.81	12,200 lbs	0.345

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