HR31308JNSKTapered Roller

Name: NSK HR31308J Tapered Roller Bearing
Brand: NSK
SKU: HR31308J

HR31308J is a NSK tapered roller bearing, bore 40 mm, O.D. 90 mm, width 23 mm, dynamic rating 18,000 lbs. Dimensions, drawing, interchanges and price.

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Bore d40mm

Outside dia. D90mm

Width B23mm

Dynamic Cr18,000lbs

Static C0r20,100lbs

Limiting speed4,290rpm

Weight0.73kg

Cr / C0r0.9

Mean dia. dm65mm

Original catalogue drawing - NSK catalogue, page 109

HR31308J NSK Tapered Roller bearing catalogue drawing

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	40	1.5748
D	Outside diameter	90	3.5433
B	Inner-ring / bearing width	23	0.9055
T	Overall assembly width	25.25	0.9941
C	Cup / outer-ring width	17	0.6693

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)	40
Bore d (in)	1.5748
Outside dia. D (mm)	90
Outside dia. D (in)	3.5433
Width B (mm)	23
Width B (in)	0.9055
Overall width T (mm)	25.25
Overall width T (in)	0.9941
Cup width C (mm)	17
Cup width C (in)	0.6693

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	18000
Basic static load rating Cor (lbs)	20100
Limiting speed - grease (rpm)	4,290
Limiting speed - oil (rpm)	5,820

Weight

Weight (kg)	0.73

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.06
Shaft shoulder da min (in)	1.988
Housing shoulder Da max (in)	3.189
Shaft shoulder db max (in)	2.000

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,400 rpm
4	20,017	102	1,209
6	13,345	392	4,673
8	10,008	1,024	12,190
10	8,007	2,154	25,648
15	5,338	8,323	99,089

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 80,068 N. Hours = L₁₀ x 10⁶ / (60n). Life-modification factors for lubrication, contamination and temperature (a_ISO) 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.

Interchange - same dimensions, other brands

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1308-K-TVH-C3	FAG	Ball	40	90	23	30 kN	0.698
1308-TVH	FAG	Ball	40	90	23	30 kN	0.708
6308	FAG	Ball	40	90	23	42.5 kN	0.64
6308-2RSR	FAG	Ball	40	90	23	42.5 kN	0.654
6308-2Z	FAG	Ball	40	90	23	42.5 kN	0.654
6308-C	FAG	Ball	40	90	23	47 kN	0.6
6308-C-2BRS	FAG	Ball	40	90	23	47 kN	0.654
6308-C-2HRS	FAG	Ball	40	90	23	47 kN	0.622
6308-C-2Z	FAG	Ball	40	90	23	47 kN	0.617
QJ308-TVP	FAG	Ball	40	90	23	86.5 kN	0.695

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1308	NSK	Ball	40	90	23	6,520 lbs	0.744
6308	NSK	Ball	40	90	23	9,160 lbs	0.635
7308B	NSK	Ball	40	90	23	9,480 lbs	0.658
BL308	NSK	Ball	40	90	23	12,300 lbs	0.667
308	NSK	Cylindrical Roller	40	90	23	13,200 lbs	0.653
NU308E	NSK	Cylindrical Roller	40	90	23	102 kN	0.747
21308EAE4	NSK	Spherical Roller	40	90	23	118 kN	0.73
HR30308	NSK	Tapered Roller	40	90	23	111 kN	0.758

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
HR30208	NSK	Tapered Roller	40	80	18	78 kN	0.437
HR30208C	NSK	Tapered Roller	40	80	18	24,100 lbs	0.424
HR30208J	NSK	Tapered Roller	40	80	18	14,300 lbs	0.44
HR30308	NSK	Tapered Roller	40	90	23	111 kN	0.758
HR30308C	NSK	Tapered Roller	40	90	23	19,000 lbs	0.717
HR30308J	NSK	Tapered Roller	40	90	23	20,300 lbs	0.757
HR31308	NSK	Tapered Roller	40	90	23	98 kN	0.728
HR32008	NSK	Tapered Roller	40	68	19	65 kN	0.28

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