238 is a NSK cylindrical roller bearing, bore 190 mm, O.D. 340 mm, width 55 mm, dynamic rating 124,000 lbs. Dimensions, drawing, interchanges and price.
Original catalogue drawing - NSK catalogue, page 53
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
190
7.4803
D
Outside diameter
340
13.3858
B
Inner-ring / bearing width
55
2.1654
Notes
Cylindrical roller entries from the NSK inch catalogue are series numbers covering the N / NU / NJ / NUP / NH prefixes of the same size. 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)
190
Bore d (in)
7.4803
Outside dia. D (mm)
340
Outside dia. D (in)
13.3858
Width B (mm)
55
Width B (in)
2.1654
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
124000
Basic static load rating Cor (lbs)
173000
Limiting speed - grease (rpm)
1,800
Limiting speed - oil (rpm)
2,200
Weight
Weight (kg)
22.226
Mounting dimensions (fillets / shoulders)
Fillet ra max (in)
0.118
Fillet rb max (in)
0.118
Shaft shoulder da min (in)
8.189
Housing shoulder Da max (in)
12.756
Shaft shoulder db min (in)
8.110
Shaft shoulder db max (in)
8.898
Housing shoulder Db min (in)
12.008
Housing shoulder Db max (in)
12.756
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 600 rpm
4
137,895
102
2,822
6
91,930
392
10,903
8
68,947
1,024
28,444
10
55,158
2,154
59,845
15
36,772
8,323
231,207
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 551,579 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.55 (dimensions) / p.56 (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.
