6308NSKBall

Name: NSK 6308 Ball Bearing
Brand: NSK
SKU: 6308

6308 is a NSK ball bearing, bore 40 mm, O.D. 90 mm, width 23 mm, dynamic rating 9,160 lbs. Dimensions, drawing, interchanges and price.

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Bore d40mm

Outside dia. D90mm

Width B23mm

Dynamic Cr9,160lbs

Static C0r5,400lbs

Limiting speed7,500rpm

Weight0.635kg

Cr / C0r1.7

Mean dia. dm65mm

Original catalogue drawing - NSK catalogue, page 19

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
r	Chamfer (min)	1.499	0.059

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

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	9160
Basic static load rating Cor (lbs)	5400
Limiting speed - grease (rpm)	7,500
Limiting speed - oil (rpm)	9,000
Factor f0	13.2

Weight

Weight (kg)	0.635

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.059
Shaft shoulder da min (in)	1.929
Shaft shoulder da max (in)	2.088
Housing shoulder Da max (in)	3.189

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,500 rpm
4	10,186	64	427
6	6,791	216	1,440
8	5,093	512	3,413
10	4,075	1,000	6,667
15	2,716	3,375	22,500

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 40,746 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.21 (dimensions) / p.22 (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
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
HR30308C	NSK	Tapered Roller	40	90	23	19,000 lbs	0.717

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1208	NSK	Ball	40	80	18	4,340 lbs	0.417
1308	NSK	Ball	40	90	23	6,520 lbs	0.744
16008	NSK	Ball	40	68	9	13.9 kN	0.13
2208	NSK	Ball	40	80	23	7,080 lbs	0.49
2308	NSK	Ball	40	90	33	10,100 lbs	0.998
3208J	NSK	Ball	40	80	30.2	9,290 lbs	0.653
3308J	NSK	Ball	40	90	36.5	13,100 lbs	1.066
5208J	NSK	Ball	40	80	30.2	9,930 lbs	0.572

Request a quotation for 6308

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