2308NSKCylindrical Roller

Name: NSK 2308 Cylindrical Roller Bearing
Brand: NSK
SKU: 2308

2308 is a NSK cylindrical roller bearing, bore 40 mm, O.D. 90 mm, width 33 mm, dynamic rating 18,500 lbs. Dimensions, drawing, interchanges and price.

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Bore d40mm

Outside dia. D90mm

Width B33mm

Dynamic Cr18,500lbs

Static C0r19,700lbs

Limiting speed6,000rpm

Weight0.943kg

Cr / C0r0.94

Mean dia. dm65mm

Original catalogue drawing - NSK catalogue, page 63

2308 NSK Cylindrical 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	33	1.2992

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)	40
Bore d (in)	1.5748
Outside dia. D (mm)	90
Outside dia. D (in)	3.5433
Width B (mm)	33
Width B (in)	1.2992

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	18500
Basic static load rating Cor (lbs)	19700
Limiting speed - grease (rpm)	6,000
Limiting speed - oil (rpm)	7,500

Weight

Weight (kg)	0.943

Mounting dimensions (fillets / shoulders)

Fillet ra max (in)	0.059
Fillet rb max (in)	0.059
Shaft shoulder da min (in)	1.890
Housing shoulder Da max (in)	3.228
Shaft shoulder db min (in)	1.890

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,000 rpm
4	20,573	102	847
6	13,715	392	3,271
8	10,287	1,024	8,533
10	8,229	2,154	17,954
15	5,486	8,323	69,362

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 82,292 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.65 (dimensions) / p.66 (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
2308-2RS-TVH	FAG	Ball	40	90	33	30 kN	1.01
2308-K-TVH-C3	FAG	Ball	40	90	33	46 kN	0.899
2308-TVH	FAG	Ball	40	90	33	46 kN	0.922
4308-B-TVH	FAG	Ball	40	90	33	67 kN	0.83
62308-2RSR	FAG	Ball	40	90	33	46.5 kN	0.882
NJ2308-E-TVP2	FAG	Cylindrical Roller	40	90	33	132 kN	0.978
NJ2308-E-XL-TVP2	FAG	Cylindrical Roller	40	90	33	132 kN	0.978
NU2308-E-TVP2	FAG	Cylindrical Roller	40	90	33	132 kN	0.958
NU2308-E-XL-TVP2	FAG	Cylindrical Roller	40	90	33	132 kN	0.958
NUP2308-E-TVP2	FAG	Cylindrical Roller	40	90	33	132 kN	0.999

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
2308	NSK	Ball	40	90	33	10,100 lbs	0.998
NU2308E	NSK	Cylindrical Roller	40	90	33	140 kN	0.933
22308CAME4	NSK	Spherical Roller	40	90	33	27,400 lbs	0.984
22308EAE4	NSK	Spherical Roller	40	90	33	30,642 lbs	1.016
22308HE4	NSK	Spherical Roller	40	90	33	30,500 lbs	0.948
HR32308	NSK	Tapered Roller	40	90	33	147 kN	1.05
HR32308C	NSK	Tapered Roller	40	90	33	24,100 lbs	1.03
HR32308J	NSK	Tapered Roller	40	90	33	27,000 lbs	1.052

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
2308	NSK	Ball	40	90	33	10,100 lbs	0.998

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1008	NSK	Cylindrical Roller	40	68	15	6,120 lbs	0.218
208	NSK	Cylindrical Roller	40	80	18	9,790 lbs	0.386
2208	NSK	Cylindrical Roller	40	80	23	13,100 lbs	0.49
308	NSK	Cylindrical Roller	40	90	23	13,200 lbs	0.653
408	NSK	Cylindrical Roller	40	110	27	21,500 lbs	1.267
NU1008	NSK	Cylindrical Roller	40	68	15	33.5 kN	0.223
NU208E	NSK	Cylindrical Roller	40	80	18	68.5 kN	0.379
NU2208E	NSK	Cylindrical Roller	40	80	23	89 kN	0.48

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