6911NSKBall

Name: NSK 6911 Ball Bearing
Brand: NSK
SKU: 6911

6911 is a NSK ball bearing, bore 55 mm, O.D. 80 mm, width 13 mm, dynamic rating 3,590 lbs. Dimensions, drawing, interchanges and price.

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Bore d55mm

Outside dia. D80mm

Width B13mm

Dynamic Cr3,590lbs

Static C0r2,970lbs

Limiting speed8,000rpm

Weight0.181kg

Cr / C0r1.21

Mean dia. dm67.5mm

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	55	2.1654
D	Outside diameter	80	3.1496
B	Inner-ring / bearing width	13	0.5118
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)	55
Bore d (in)	2.1654
Outside dia. D (mm)	80
Outside dia. D (in)	3.1496
Width B (mm)	13
Width B (in)	0.5118

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	3590
Basic static load rating Cor (lbs)	2970
Limiting speed - grease (rpm)	8,000
Limiting speed - oil (rpm)	9,500
Factor f0	16.2

Weight

Weight (kg)	0.181

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	2.362
Shaft shoulder da max (in)	2.421
Housing shoulder Da max (in)	2.953

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,600 rpm
4	3,992	64	410
6	2,662	216	1,385
8	1,996	512	3,282
10	1,597	1,000	6,410
15	1,065	3,375	21,635

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 15,969 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
61911	FAG	Ball	55	80	13	17.7 kN	0.185
61911-2RSR	FAG	Ball	55	80	13	17.7 kN	0.18
61911-2RZ	FAG	Ball	55	80	13	17.7 kN	0.18
B71911-C-T-P4S	FAG	Precision / Angular Contact	55	80	13	22.8 kN	0.182
B71911-E-T-P4S	FAG	Precision / Angular Contact	55	80	13	21.6 kN	0.181
HCB71911-C-T-P4S	FAG	Precision / Angular Contact	55	80	13	16 kN	0.18
HCB71911-E-T-P4S	FAG	Precision / Angular Contact	55	80	13	15 kN	0.18
HCS71911-C-T-P4S	FAG	Precision / Angular Contact	55	80	13	9.3 kN	0.17
HCS71911-E-T-P4S	FAG	Precision / Angular Contact	55	80	13	8.8 kN	0.17
HSS71911-C-T-P4S	FAG	Precision / Angular Contact	55	80	13	13.4 kN	0.198

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
7911A5	NSK	Precision / Angular Contact	55	80	13	4,060 lbs	0.181
7911C	NSK	Precision / Angular Contact	55	80	13	4,300 lbs	0.177

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1211	NSK	Ball	55	100	21	6,070 lbs	0.694
1311	NSK	Ball	55	120	29	11,500 lbs	1.642
16011	NSK	Ball	55	90	11	21.4 kN	0.257
2211	NSK	Ball	55	100	25	5,960 lbs	0.83
2311	NSK	Ball	55	120	43	16,900 lbs	2.291
3211J	NSK	Ball	55	100	33.3	13,200 lbs	1.048
3311J	NSK	Ball	55	120	49.2	22,000 lbs	2.545
5211J	NSK	Ball	55	100	33.3	12,600 lbs	0.962

Request a quotation for 6911

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