7221BNSKBall

Name: NSK 7221B Ball Bearing
Brand: NSK
SKU: 7221B

7221B is a NSK ball bearing, bore 105 mm, O.D. 190 mm, width 36 mm, dynamic rating 30,400 lbs. Dimensions, drawing, interchanges and price.

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Bore d105mm

Outside dia. D190mm

Width B36mm

Dynamic Cr30,400lbs

Static C0r27,100lbs

Limiting speed2,600rpm

Weight4.4kg

Cr / C0r1.12

Mean dia. dm147.5mm

Original catalogue drawing - NSK catalogue, page 37

7221B NSK Ball bearing catalogue drawing

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	190	7.4803
B	Inner-ring / bearing width	36	1.4173
r	Chamfer (min)	2.007	0.079

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)	190
Outside dia. D (in)	7.4803
Width B (mm)	36
Width B (in)	1.4173

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	30400
Basic static load rating Cor (lbs)	27100
Limiting speed - grease (rpm)	2,600
Limiting speed - oil (rpm)	3,600

Weight

Weight (kg)	4.4

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.079
Shaft shoulder da min (in)	4.606
Housing shoulder Da max (in)	7.008

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 800 rpm
4	33,806	64	1,333
6	22,538	216	4,500
8	16,903	512	10,667
10	13,523	1,000	20,833
15	9,015	3,375	70,312

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 135,226 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.39 (dimensions) / p.40 (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
1221-M	FAG	Ball	105	190	36	75 kN	4.75
6221	FAG	Ball	105	190	36	141 kN	3.88
6221-2RSR	FAG	Ball	105	190	36	141 kN	3.73
6221-2Z	FAG	Ball	105	190	36	141 kN	3.99
QJ221-N2-MPA	FAG	Ball	105	190	36	233 kN	4.81
N221-E-M1	FAG	Cylindrical Roller	105	190	36	310 kN	4.63
N221-E-XL-M1	FAG	Cylindrical Roller	105	190	36	310 kN	4.63
NJ221-E-TVP2	FAG	Cylindrical Roller	105	190	36	310 kN	4.17
NJ221-E-XL-TVP2	FAG	Cylindrical Roller	105	190	36	310 kN	4.17
NU221-E-TVP2	FAG	Cylindrical Roller	105	190	36	310 kN	4.08

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1221	NSK	Ball	105	190	36	82.5 kN	4.43
6221	NSK	Ball	105	190	36	29,900 lbs	3.697
BL221	NSK	Ball	105	190	36	39,200 lbs	4.173
221	NSK	Cylindrical Roller	105	190	36	45,100 lbs	4.051
HR30221	NSK	Tapered Roller	105	190	36	345 kN	4.51
HR30221J	NSK	Tapered Roller	105	190	36	62,900 lbs	4.509
7221	NSK	Precision / Angular Contact	105	190	36	172 kN	3.84
7221A5	NSK	Precision / Angular Contact	105	190	36	34,800 lbs	3.769

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 7221B

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