Original catalogue drawing - NSK catalogue, page 21
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
12
0.4724
D
Outside diameter
21
0.8268
B
Inner-ring / bearing width
5
0.1969
r
Chamfer (min)
0.305
0.012
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)
12
Bore d (in)
0.4724
Outside dia. D (mm)
21
Outside dia. D (in)
0.8268
Width B (mm)
5
Width B (in)
0.1969
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
429
Basic static load rating Cor (lbs)
233
Limiting speed - grease (rpm)
32,000
Limiting speed - oil (rpm)
38,000
Factor f0
15.3
Weight
Weight (kg)
0.00454
Mounting dimensions (fillets / shoulders)
Chamfer r (in)
0.012
Shaft shoulder da min (in)
0.551
Shaft shoulder da max (in)
0.551
Housing shoulder Da max (in)
0.748
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 3,000 rpm
4
477
64
356
6
318
216
1,200
8
239
512
2,844
10
191
1,000
5,556
15
127
3,375
18,750
Basic rating life per ISO 281: L10 = (C/P)3 with C = 1,908 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.23 (dimensions) / p.24 (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.
