6921NSKBall

Name: NSK 6921 Ball Bearing
Brand: NSK
SKU: 6921

6921 is a NSK ball bearing, bore 105 mm, O.D. 145 mm, width 20 mm, dynamic rating 9,460 lbs. Dimensions, drawing, interchanges and price.

Request a quote WhatsApp Email us Search the catalog

Bore d105mm

Outside dia. D145mm

Width B20mm

Dynamic Cr9,460lbs

Static C0r9,460lbs

Limiting speed4,300rpm

Weight0.835kg

Cr / C0r1

Mean dia. dm125mm

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	105	4.1339
D	Outside diameter	145	5.7087
B	Inner-ring / bearing width	20	0.7874
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)	145
Outside dia. D (in)	5.7087
Width B (mm)	20
Width B (in)	0.7874

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	9460
Basic static load rating Cor (lbs)	9460
Limiting speed - grease (rpm)	4,300
Limiting speed - oil (rpm)	5,300
Factor f0	16.5

Weight

Weight (kg)	0.835

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	4.390
Shaft shoulder da max (in)	4.567
Housing shoulder Da max (in)	5.453

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,400 rpm
4	10,520	64	762
6	7,013	216	2,571
8	5,260	512	6,095
10	4,208	1,000	11,905
15	2,805	3,375	40,179

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 42,080 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
61921	FAG	Ball	105	145	20	46.5 kN	0.87
B71921-C-T-P4S	FAG	Precision / Angular Contact	105	145	20	58.5 kN	0.814
B71921-E-T-P4S	FAG	Precision / Angular Contact	105	145	20	55 kN	0.813
HCB71921-C-T-P4S	FAG	Precision / Angular Contact	105	145	20	40 kN	0.82
HCB71921-E-T-P4S	FAG	Precision / Angular Contact	105	145	20	38 kN	0.82
HCS71921-C-T-P4S	FAG	Precision / Angular Contact	105	145	20	20.8 kN	0.851
HCS71921-E-T-P4S	FAG	Precision / Angular Contact	105	145	20	19.6 kN	0.85
HSS71921-C-T-P4S	FAG	Precision / Angular Contact	105	145	20	30 kN	0.897
HSS71921-E-T-P4S	FAG	Precision / Angular Contact	105	145	20	28 kN	0.87

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
7921A5	NSK	Precision / Angular Contact	105	145	20	10,800 lbs	0.821
7921C	NSK	Precision / Angular Contact	105	145	20	11,500 lbs	0.812

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
6821	NSK	Ball	105	130	13	4,440 lbs	0.313

Request a quotation for 6921

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