6909NSKBall

Name: NSK 6909 Ball Bearing
Brand: NSK
SKU: 6909

6909 is a NSK ball bearing, bore 45 mm, O.D. 68 mm, width 12 mm, dynamic rating 3,170 lbs. Dimensions, drawing, interchanges and price.

Request a quote WhatsApp Email us Search the catalog

Bore d45mm

Outside dia. D68mm

Width B12mm

Dynamic Cr3,170lbs

Static C0r2,440lbs

Limiting speed9,500rpm

Weight0.122kg

Cr / C0r1.3

Mean dia. dm56.5mm

Original catalogue drawing - NSK catalogue, page 23

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	45	1.7717
D	Outside diameter	68	2.6772
B	Inner-ring / bearing width	12	0.4724
r	Chamfer (min)	0.61	0.024

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)	45
Bore d (in)	1.7717
Outside dia. D (mm)	68
Outside dia. D (in)	2.6772
Width B (mm)	12
Width B (in)	0.4724

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	3170
Basic static load rating Cor (lbs)	2440
Limiting speed - grease (rpm)	9,500
Limiting speed - oil (rpm)	12,000
Factor f0	15.9

Weight

Weight (kg)	0.122

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.024
Shaft shoulder da min (in)	1.929
Shaft shoulder da max (in)	1.969
Housing shoulder Da max (in)	2.520

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 3,000 rpm
4	3,525	64	356
6	2,350	216	1,200
8	1,763	512	2,844
10	1,410	1,000	5,556
15	940	3,375	18,750

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 14,101 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.25 (dimensions) / p.26 (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
61909	FAG	Ball	45	68	12	15 kN	0.135
61909-2RSR	FAG	Ball	45	68	12	15 kN	0.13
61909-2RZ	FAG	Ball	45	68	12	15 kN	0.13
61909-2Z	FAG	Ball	45	68	12	14 kN	0.13
B71909-C-T-P4S	FAG	Precision / Angular Contact	45	68	12	18.6 kN	0.127
B71909-E-T-P4S	FAG	Precision / Angular Contact	45	68	12	17.6 kN	0.127
HCB71909-C-T-P4S	FAG	Precision / Angular Contact	45	68	12	12.9 kN	0.13
HCB71909-E-T-P4S	FAG	Precision / Angular Contact	45	68	12	12.2 kN	0.13
HCS71909-C-T-P4S	FAG	Precision / Angular Contact	45	68	12	7 kN	0.135
HCS71909-E-T-P4S	FAG	Precision / Angular Contact	45	68	12	6.5 kN	0.135

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
7909A5	NSK	Precision / Angular Contact	45	68	12	3,400 lbs	0.127
7909C	NSK	Precision / Angular Contact	45	68	12	3,590 lbs	0.127

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1209	NSK	Ball	45	85	19	4,950 lbs	0.463
1309	NSK	Ball	45	100	25	8,540 lbs	0.993
16009	NSK	Ball	45	75	10	16.4 kN	0.167
2209	NSK	Ball	45	85	23	6,290 lbs	0.531
2309	NSK	Ball	45	100	36	12,100 lbs	1.32
3209J	NSK	Ball	45	85	30.2	9,890 lbs	0.708
3309J	NSK	Ball	45	100	39.7	16,000 lbs	1.397
5209J	NSK	Ball	45	85	30.2	11,100 lbs	0.621

Request a quotation for 6909

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.

Online enquiry form richard@bearingsfit.com WhatsApp +86 156 2149 6516