7211BNSKBall

Name: NSK 7211B Ball Bearing
Brand: NSK
SKU: 7211B

7211B is a NSK ball bearing, bore 55 mm, O.D. 100 mm, width 21 mm, dynamic rating 9,920 lbs. Dimensions, drawing, interchanges and price.

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Bore d55mm

Outside dia. D100mm

Width B21mm

Dynamic Cr9,920lbs

Static C0r7,610lbs

Limiting speed5,300rpm

Weight0.635kg

Cr / C0r1.3

Mean dia. dm77.5mm

Original catalogue drawing - NSK catalogue, page 37

7211B 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	55	2.1654
D	Outside diameter	100	3.937
B	Inner-ring / bearing width	21	0.8268
r	Chamfer (min)	1.499	0.059

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)	100
Outside dia. D (in)	3.9370
Width B (mm)	21
Width B (in)	0.8268

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	9920
Basic static load rating Cor (lbs)	7610
Limiting speed - grease (rpm)	5,300
Limiting speed - oil (rpm)	7,100

Weight

Weight (kg)	0.635

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.059
Shaft shoulder da min (in)	2.500
Housing shoulder Da max (in)	3.602

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,700 rpm
4	11,032	64	627
6	7,354	216	2,118
8	5,516	512	5,020
10	4,413	1,000	9,804
15	2,942	3,375	33,088

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 44,126 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
11211-TVH	FAG	Ball	55	100	21	27 kN	1.13
1211-K-TVH-C3	FAG	Ball	55	100	21	27 kN	0.682
1211-TVH	FAG	Ball	55	100	21	27 kN	0.693
6211	FAG	Ball	55	100	21	46 kN	0.618
6211-2RSR	FAG	Ball	55	100	21	46 kN	0.632
6211-2Z	FAG	Ball	55	100	21	46 kN	0.632
QJ211-TVP	FAG	Ball	55	100	21	80 kN	0.697
QJ211-XL-TVP	FAG	Ball	55	100	21	81 kN	0.697
S6211	FAG	Ball	55	100	21	43 kN	0.617
N211-E-TVP2	FAG	Cylindrical Roller	55	100	21	99 kN	0.668

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1211	NSK	Ball	55	100	21	6,070 lbs	0.694
6211	NSK	Ball	55	100	21	9,760 lbs	0.617
BL211	NSK	Ball	55	100	21	12,800 lbs	0.662
211	NSK	Cylindrical Roller	55	100	21	13,000 lbs	0.653
NU211E	NSK	Cylindrical Roller	55	100	21	106 kN	0.669
HR30211	NSK	Tapered Roller	55	100	21	116 kN	0.736
HR30211J	NSK	Tapered Roller	55	100	21	21,200 lbs	0.735
7100	NSK	Precision / Angular Contact	55	100	21	78 kN	0.77

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 7211B

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