6821NSKBall

Name: NSK 6821 Ball Bearing
Brand: NSK
SKU: 6821

6821 is a NSK ball bearing, bore 105 mm, O.D. 130 mm, width 13 mm, dynamic rating 4,440 lbs. Dimensions, drawing, interchanges and price.

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Bore d105mm

Outside dia. D130mm

Width B13mm

Dynamic Cr4,440lbs

Static C0r5,370lbs

Limiting speed4,800rpm

Weight0.313kg

Cr / C0r0.83

Mean dia. dm117.5mm

Original catalogue drawing - NSK catalogue, page 21

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	105	4.1339
D	Outside diameter	130	5.1181
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)	105
Bore d (in)	4.1339
Outside dia. D (mm)	130
Outside dia. D (in)	5.1181
Width B (mm)	13
Width B (in)	0.5118

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	4440
Basic static load rating Cor (lbs)	5370
Limiting speed - grease (rpm)	4,800
Limiting speed - oil (rpm)	5,600
Factor f0	17.4

Weight

Weight (kg)	0.313

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	4.331
Shaft shoulder da max (in)	4.350
Housing shoulder Da max (in)	4.921

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,600 rpm
4	4,938	64	667
6	3,292	216	2,250
8	2,469	512	5,333
10	1,975	1,000	10,417
15	1,317	3,375	35,156

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 19,750 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.23 (dimensions) / p.24 (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
61821-2RSR-Y	FAG	Ball	105	130	13	22.1 kN	0.33
61821-2RZ-Y	FAG	Ball	105	130	13	22.1 kN	0.35
61821-2Z-Y	FAG	Ball	105	130	13	20.8 kN	0.33
61821-Y	FAG	Ball	105	130	13	22.1 kN	0.33

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1221	NSK	Ball	105	190	36	82.5 kN	4.43
1321	NSK	Ball	105	225	49	169 kN	9.58
16021	NSK	Ball	105	160	18	57 kN	1.24
2221	NSK	Ball	105	190	50	120 kN	5.73
6021	NSK	Ball	105	160	26	16,300 lbs	1.592
6221	NSK	Ball	105	190	36	29,900 lbs	3.697
6321	NSK	Ball	105	225	49	41,300 lbs	8.119
6921	NSK	Ball	105	145	20	9,460 lbs	0.835

Request a quotation for 6821

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