6820NSKBall

Name: NSK 6820 Ball Bearing
Brand: NSK
SKU: 6820

6820 is a NSK ball bearing, bore 100 mm, O.D. 125 mm, width 13 mm, dynamic rating 4,400 lbs. Dimensions, drawing, interchanges and price.

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Bore d100mm

Outside dia. D125mm

Width B13mm

Dynamic Cr4,400lbs

Static C0r5,150lbs

Limiting speed4,800rpm

Weight0.299kg

Cr / C0r0.85

Mean dia. dm112.5mm

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	100	3.937
D	Outside diameter	125	4.9213
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)	100
Bore d (in)	3.9370
Outside dia. D (mm)	125
Outside dia. D (in)	4.9213
Width B (mm)	13
Width B (in)	0.5118

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	4400
Basic static load rating Cor (lbs)	5150
Limiting speed - grease (rpm)	4,800
Limiting speed - oil (rpm)	5,600
Factor f0	17.3

Weight

Weight (kg)	0.299

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	4.134
Shaft shoulder da max (in)	4.154
Housing shoulder Da max (in)	4.724

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,600 rpm
4	4,893	64	667
6	3,262	216	2,250
8	2,447	512	5,333
10	1,957	1,000	10,417
15	1,305	3,375	35,156

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 19,572 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
61820-2RSR-Y	FAG	Ball	100	125	13	21.3 kN	0.31
61820-2RZ-Y	FAG	Ball	100	125	13	21.3 kN	0.31
61820-2Z-Y	FAG	Ball	100	125	13	20 kN	0.31
61820-Y	FAG	Ball	100	125	13	21.3 kN	0.31

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1220	NSK	Ball	100	180	34	76.5 kN	3.74
1320	NSK	Ball	100	215	47	155 kN	8.4
16020	NSK	Ball	100	150	16	46.5 kN	0.945
6020	NSK	Ball	100	150	24	13,500 lbs	1.252
6220	NSK	Ball	100	180	34	27,500 lbs	3.148
6320	NSK	Ball	100	215	47	38,900 lbs	6.94
6920	NSK	Ball	100	140	20	9,570 lbs	0.807
7220B	NSK	Ball	100	180	34	28,000 lbs	3.697

Request a quotation for 6820

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