6306NSKBall

Name: NSK 6306 Ball Bearing
Brand: NSK
SKU: 6306

6306 is a NSK ball bearing, bore 30 mm, O.D. 72 mm, width 19 mm, dynamic rating 5,990 lbs. Dimensions, drawing, interchanges and price.

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Bore d30mm

Outside dia. D72mm

Width B19mm

Dynamic Cr5,990lbs

Static C0r3,380lbs

Limiting speed9,500rpm

Weight0.345kg

Cr / C0r1.77

Mean dia. dm51mm

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	30	1.1811
D	Outside diameter	72	2.8346
B	Inner-ring / bearing width	19	0.748
r	Chamfer (min)	0.991	0.039

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)	30
Bore d (in)	1.1811
Outside dia. D (mm)	72
Outside dia. D (in)	2.8346
Width B (mm)	19
Width B (in)	0.7480

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	5990
Basic static load rating Cor (lbs)	3380
Limiting speed - grease (rpm)	9,500
Limiting speed - oil (rpm)	12,000
Factor f0	13.3

Weight

Weight (kg)	0.345

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	1.469
Shaft shoulder da max (in)	1.675
Housing shoulder Da max (in)	2.559

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 3,000 rpm
4	6,661	64	356
6	4,441	216	1,200
8	3,331	512	2,844
10	2,664	1,000	5,556
15	1,776	3,375	18,750

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 26,645 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
1306-K-TVH-C3	FAG	Ball	30	72	19	21.7 kN	0.379
1306-TVH	FAG	Ball	30	72	19	21.7 kN	0.384
6306	FAG	Ball	30	72	19	29 kN	0.355
6306-2RSR	FAG	Ball	30	72	19	29 kN	0.365
6306-2Z	FAG	Ball	30	72	19	29 kN	0.363
6306-C	FAG	Ball	30	72	19	32 kN	0.328
6306-C-2BRS	FAG	Ball	30	72	19	32 kN	0.339
6306-C-2HRS	FAG	Ball	30	72	19	32 kN	0.34
6306-C-2Z	FAG	Ball	30	72	19	32 kN	0.339
QJ306-TVP	FAG	Ball	30	72	19	58.5 kN	0.379

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1306	NSK	Ball	30	72	19	4,770 lbs	0.408
7306B	NSK	Ball	30	72	19	6,550 lbs	0.358
BL306	NSK	Ball	30	72	19	7,410 lbs	0.363
306	NSK	Cylindrical Roller	30	72	19	8,690 lbs	0.358
NU306E	NSK	Cylindrical Roller	30	72	19	65.5 kN	0.409
HR30306	NSK	Tapered Roller	30	72	19	73 kN	0.403
HR30306C	NSK	Tapered Roller	30	72	19	12,700 lbs	0.39
HR30306J	NSK	Tapered Roller	30	72	19	13,400 lbs	0.404

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1206	NSK	Ball	30	62	16	3,510 lbs	0.222
1306	NSK	Ball	30	72	19	4,770 lbs	0.408
16006	NSK	Ball	30	55	9	12.4 kN	0.087
2206	NSK	Ball	30	62	20	5,730 lbs	0.249
2306	NSK	Ball	30	72	27	7,080 lbs	0.553
3206J	NSK	Ball	30	62	23.8	5,940 lbs	0.318
3306J	NSK	Ball	30	72	30.2	8,410 lbs	0.585
5206J	NSK	Ball	30	62	23.8	6,650 lbs	0.29

Request a quotation for 6306

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