HR31311J is a NSK tapered roller bearing, bore 55 mm, O.D. 120 mm, width 29 mm, dynamic rating 29,400 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
55
2.1654
D
Outside diameter
120
4.7244
B
Inner-ring / bearing width
29
1.1417
T
Overall assembly width
31.5
1.2402
C
Cup / outer-ring width
21
0.8268
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)
55
Bore d (in)
2.1654
Outside dia. D (mm)
120
Outside dia. D (in)
4.7244
Width B (mm)
29
Width B (in)
1.1417
Overall width T (mm)
31.5
Overall width T (in)
1.2402
Cup width C (mm)
21
Cup width C (in)
0.8268
Load ratings & speeds
Basic dynamic load rating Cr (lbs)
29400
Basic static load rating Cor (lbs)
34400
Limiting speed - grease (rpm)
3,250
Limiting speed - oil (rpm)
4,410
Weight
Weight (kg)
1.579
Mounting dimensions (fillets / shoulders)
Chamfer r (in)
0.08
Shaft shoulder da min (in)
2.638
Housing shoulder Da max (in)
4.331
Shaft shoulder db max (in)
2.657
Bearing life (ISO 281 basic rating life)
C / P
Equivalent load P (N)
L10 (106 rev)
L10h at 1,000 rpm
4
32,694
102
1,693
6
21,796
392
6,542
8
16,347
1,024
17,067
10
13,078
2,154
35,907
15
8,719
8,323
138,724
Basic rating life per ISO 281: L10 = (C/P)10/3 with C = 130,778 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.
