25877/25821NSKTapered Roller

Name: NSK 25877/25821 Tapered Roller Bearing
Brand: NSK
SKU: 25877/25821

25877/25821 is a NSK tapered roller bearing, bore 34.92 mm, O.D. 73.03 mm, width 24.61 mm. Dimensions, drawing, interchanges and price.

Cone + cup assembly

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Bore d34.92mm

Outside dia. D73.03mm

Width B24.61mm

Dynamic Cr16,000lbs

Static C0r19,300lbs

Weight0.467kg

Cr / C0r0.83

Mean dia. dm54mm

Original catalogue drawing - NSK catalogue, page 135

25877/25821 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	34.925	1.375
D	Outside diameter	73.025	2.875
B	Inner-ring / bearing width	24.608	0.9688
T	Overall assembly width	23.812	0.9375
C	Cup / outer-ring width	19.05	0.75
r	Chamfer (min)	1.524	0.06

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)	34.925
Bore d (in)	1.3750
Outside dia. D (mm)	73.025
Outside dia. D (in)	2.8750
Width B (in)	0.9688
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)	16000
Basic static load rating Cor (lbs)	19300
Effective centre a (in)	0.62

Weight

Cone weight (kg)	0.304
Cup weight (kg)	0.163
Total weight (kg)	0.467

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.06
Chamfer r1 (in)	0.03
Shaft shoulder da min (in)	2.56
Shaft shoulder da (in)	1.59
Housing shoulder Da (in)	2.68

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	17,793	102	3,386
6	11,862	392	13,083
8	8,896	1,024	34,133
10	7,117	2,154	71,814
15	4,745	8,323	277,449

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 71,172 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
K25877-25821-XL	FAG	Tapered Roller	34.92	73.03	24.61	78 kN	0.462
25877/25820	Timken	Tapered Roller	34.92	73.03	24.61	85.1 kN	0.47
25877/25821	Timken	Tapered Roller	34.92	73.03	24.61	85.1 kN	0.48
25877A/25821	Timken	Tapered Roller	34.92	73.03	24.61	85.1 kN	0.48
25878/25820	Timken	Tapered Roller	34.92	73.03	24.61	85.1 kN	0.46
25878/25821	Timken	Tapered Roller	34.92	73.03	24.61	85.1 kN	0.47

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
14136A/14276	NSK	Tapered Roller	34.92	69.01	26.72	10,400 lbs	0.358
14137A/14276	NSK	Tapered Roller	34.92	69.01	19.58	10,400 lbs	0.322
14138A/14276	NSK	Tapered Roller	34.92	69.01	19.58	10,400 lbs	0.322
LM48548/LM48510	NSK	Tapered Roller	34.92	65.09	18.29	10,700 lbs	0.249
HR30207	NSK	Tapered Roller	35	72	17	66.5 kN	0.34
HR30207C	NSK	Tapered Roller	35	72	17	10,600 lbs	0.324
HR30207J	NSK	Tapered Roller	35	72	17	12,100 lbs	0.34
HR30307	NSK	Tapered Roller	35	80	21	93.5 kN	0.538

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