HR31321J is a NSK tapered roller bearing, bore 105 mm, O.D. 225 mm, width 49 mm, dynamic rating 76,400 lbs. Dimensions, drawing, interchanges and price.
Original catalogue drawing - NSK catalogue, page 109
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
225
8.8583
B
Inner-ring / bearing width
49
1.9291
T
Overall assembly width
53.5
2.1063
C
Cup / outer-ring width
35
1.378
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)
105
Bore d (in)
4.1339
Outside dia. D (mm)
225
Outside dia. D (in)
8.8583
Width B (mm)
49
Width B (in)
1.9291
Overall width T (mm)
53.5
Overall width T (in)
2.1063
Cup width C (mm)
35
Cup width C (in)
1.3780
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
76400
Basic static load rating Cor (lbs)
121000
Limiting speed - grease (rpm)
1,650
Limiting speed - oil (rpm)
2,250
Weight
Weight (kg)
10.043
Mounting dimensions (fillets / shoulders)
Chamfer r (in)
0.10
Shaft shoulder da min (in)
4.843
Housing shoulder Da max (in)
8.307
Shaft shoulder db max (in)
8.307
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 500 rpm
4
84,961
102
3,386
6
56,641
392
13,083
8
42,481
1,024
34,133
10
33,984
2,154
71,814
15
22,656
8,323
277,449
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 339,844 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.111 (dimensions) / p.112 (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.
