344 is a NSK cylindrical roller bearing, bore 220 mm, O.D. 460 mm, width 88 mm, dynamic rating 268,000 lbs. Dimensions, drawing, interchanges and price.
Original catalogue drawing - NSK catalogue, page 55
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
220
8.6614
D
Outside diameter
460
18.1102
B
Inner-ring / bearing width
88
3.4646
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)
220
Bore d (in)
8.6614
Outside dia. D (mm)
460
Outside dia. D (in)
18.1102
Width B (mm)
88
Width B (in)
3.4646
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
268000
Basic static load rating Cor (lbs)
354000
Limiting speed - grease (rpm)
1,200
Limiting speed - oil (rpm)
1,500
Weight
Weight (kg)
74.843
Mounting dimensions (fillets / shoulders)
Fillet ra max (in)
0.157
Fillet rb max (in)
0.157
Shaft shoulder da min (in)
9.449
Housing shoulder Da max (in)
17.323
Shaft shoulder db min (in)
9.449
Shaft shoulder db max (in)
10.945
Housing shoulder Db min (in)
15.866
Housing shoulder Db max (in)
17.323
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 400 rpm
4
298,031
102
4,233
6
198,687
392
16,354
8
149,015
1,024
42,667
10
119,212
2,154
89,768
15
79,475
8,323
346,811
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 1,192,123 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.57 (dimensions) / p.58 (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.
