221 is a NSK cylindrical roller bearing, bore 105 mm, O.D. 190 mm, width 36 mm, dynamic rating 45,100 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
105
4.1339
D
Outside diameter
190
7.4803
B
Inner-ring / bearing width
36
1.4173
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)
105
Bore d (in)
4.1339
Outside dia. D (mm)
190
Outside dia. D (in)
7.4803
Width B (mm)
36
Width B (in)
1.4173
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
45100
Basic static load rating Cor (lbs)
54100
Limiting speed - grease (rpm)
3,400
Limiting speed - oil (rpm)
4,000
Weight
Weight (kg)
4.051
Mounting dimensions (fillets / shoulders)
Fillet ra max (in)
0.079
Fillet rb max (in)
0.079
Shaft shoulder da min (in)
4.606
Housing shoulder Da max (in)
7.047
Shaft shoulder db min (in)
4.567
Shaft shoulder db max (in)
4.843
Housing shoulder Db min (in)
6.772
Housing shoulder Db max (in)
7.047
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 1,100 rpm
4
50,154
102
1,539
6
33,436
392
5,947
8
25,077
1,024
15,515
10
20,061
2,154
32,643
15
13,374
8,323
126,113
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 200,615 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.
