1321NSKBall

Name: NSK 1321 Ball Bearing
Brand: NSK
SKU: 1321

1321 is a NSK ball bearing, bore 105 mm, O.D. 225 mm, width 49 mm, dynamic rating 169 kN. Dimensions, drawing, interchanges and price.

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Bore d105mm

Outside dia. D225mm

Width B49mm

Dynamic Cr169kN

Static C0r64.5kN

Limiting speed2,600rpm

Weight9.58kg

Cr / C0r2.62

Mean dia. dm165mm

Original catalogue drawing - NSK E1103, page 227

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	225	8.8583
B	Inner-ring / bearing width	49	1.9291
r	Chamfer (min)	3	0.1181

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
Outside dia. D (mm)	225
Width B (mm)	49

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	37993
Basic static load rating Cor (lbs)	14500
Basic dynamic load rating Cr (N)	169000
Basic static load rating C0r (N)	64500
Limiting speed - grease (rpm)	2,600
Limiting speed - oil (rpm)	3,200

Weight

Weight (kg)	9.58

Mounting dimensions (fillets / shoulders)

Housing fillet r max (mm)	3

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 800 rpm
4	42,250	64	1,333
6	28,167	216	4,500
8	21,125	512	10,667
10	16,900	1,000	20,833
15	11,267	3,375	70,312

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 169,000 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 CAT. No. E1103 (metric)
Catalogue page	p.227 (dimensions)

Load ratings in newtons, weights in kg, limiting speeds for grease and oil lubrication.

Interchange - same dimensions, other brands

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1321-M	FAG	Ball	105	225	49	158 kN	10.3
6321	FAG	Ball	105	225	49	188 kN	8.7
30321-XL	FAG	Tapered Roller	105	225	49	530 kN	10.5
7321-B-MP	FAG	Precision / Angular Contact	105	225	49	209 kN	9
7321-B-XL-MP	FAG	Precision / Angular Contact	105	225	49	225 kN	9.3

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
6321	NSK	Ball	105	225	49	41,300 lbs	8.119
7321B	NSK	Ball	105	225	49	42,800 lbs	9.389
321	NSK	Cylindrical Roller	105	225	49	71,500 lbs	8.618
NU321E	NSK	Cylindrical Roller	105	225	49	525 kN	9.84
HR30321	NSK	Tapered Roller	105	225	49	560 kN	9.52
HR30321J	NSK	Tapered Roller	105	225	49	102,000 lbs	9.525
HR31321J	NSK	Tapered Roller	105	225	49	76,400 lbs	10.043
7321	NSK	Precision / Angular Contact	105	225	49	210 kN	9.43

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1221	NSK	Ball	105	190	36	82.5 kN	4.43
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
6921	NSK	Ball	105	145	20	9,460 lbs	0.835

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