Original catalogue drawing - NSK catalogue, page 135
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
31.75
1.25
D
Outside diameter
63.5
2.5
B
Inner-ring / bearing width
20.637
0.8125
T
Overall assembly width
20.638
0.8125
C
Cup / outer-ring width
15.875
0.625
r
Chamfer (min)
0.762
0.03
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)
31.750
Bore d (in)
1.2500
Outside dia. D (mm)
63.500
Outside dia. D (in)
2.5000
Width B (in)
0.8125
Overall width T (mm)
20.638
Overall width T (in)
0.8125
Cup width C (in)
0.6250
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
10400
Basic static load rating Cor (lbs)
11900
Effective centre a (in)
0.58
Weight
Cone weight (kg)
0.168
Cup weight (kg)
0.113
Total weight (kg)
0.281
Mounting dimensions (fillets / shoulders)
Chamfer r (in)
0.03
Chamfer r1 (in)
0.05
Shaft shoulder da min (in)
2.20
Shaft shoulder da (in)
1.44
Housing shoulder Da (in)
2.32
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
11,565
102
3,386
6
7,710
392
13,083
8
5,783
1,024
34,133
10
4,626
2,154
71,814
15
3,084
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 46,262 N. Hours = L10 x 106 / (60n). Life-modification factors for lubrication, contamination and temperature (aISO) 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.
Send us the quantity you need and we will come back with price and
lead time, normally within 24 hours. Equivalent parts from other brands can be quoted at the same time.
