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
300
11.811
D
Outside diameter
440
17.3228
B
Inner-ring / bearing width
76
2.9921
T
Overall assembly width
76
2.9921
C
Cup / outer-ring width
57
2.2441
r
Chamfer (min)
3
0.1181
Notes
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)
300
Outside dia. D (mm)
440
Width B (mm)
76
Overall width T (mm)
76
Cup width C (mm)
57
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
287755
Basic static load rating Cor (lbs)
499076
Basic dynamic load rating Cr (N)
1280000
Basic static load rating C0r (N)
2220000
Limiting speed - grease (rpm)
670
Effective load centre a (mm)
4
Weight
Weight (kg)
33.3
Mounting dimensions (fillets / shoulders)
Housing fillet r max (mm)
3
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 200 rpm
4
320,000
102
8,466
6
213,333
392
32,708
8
160,000
1,024
85,333
10
128,000
2,154
179,536
15
85,333
8,323
693,622
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 1,280,000 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 CAT. No. E1103 (metric)
Catalogue page
p.270 (dimensions)
Load ratings in newtons, weights in kg, limiting speeds for grease and oil lubrication.
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.
