21304CDE4NSKSpherical Roller

Name: NSK 21304CDE4 Spherical Roller Bearing
Brand: NSK
SKU: 21304CDE4

21304CDE4 is a NSK spherical roller bearing, bore 20 mm, O.D. 52 mm, width 15 mm, dynamic rating 29.3 kN. Dimensions, drawing, interchanges and price.

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Bore d20mm

Outside dia. D52mm

Width B15mm

Dynamic Cr29.3kN

Static C0r26.9kN

Limiting speed6,300rpm

Weight0.17kg

Cr / C0r1.09

Mean dia. dm36mm

Original catalogue drawing - NSK E1103, page 299

21304CDE4 NSK Spherical Roller 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	20	0.7874
D	Outside diameter	52	2.0472
B	Inner-ring / bearing width	15	0.5906
r	Chamfer (min)	1.1	0.0433

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)	20
Outside dia. D (mm)	52
Width B (mm)	15

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	6587
Basic static load rating Cor (lbs)	6047
Basic dynamic load rating Cr (N)	29300
Basic static load rating C0r (N)	26900
Limiting speed - grease (rpm)	6,300

Weight

Weight (kg)	0.17

Mounting dimensions (fillets / shoulders)

Housing fillet r max (mm)	1.1

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,100 rpm
4	7,325	102	806
6	4,883	392	3,115
8	3,662	1,024	8,127
10	2,930	2,154	17,099
15	1,953	8,323	66,059

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 29,300 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.299 (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
1304-TVH	FAG	Ball	20	52	15	12.7 kN	0.163
6304	FAG	Ball	20	52	15	16.9 kN	0.151
6304-2RSR	FAG	Ball	20	52	15	16.9 kN	0.155
6304-2Z	FAG	Ball	20	52	15	16.9 kN	0.155
QJ304-MPA	FAG	Ball	20	52	15	30 kN	0.184
QJ304-XL-MPA	FAG	Ball	20	52	15	31 kN	0.184
S6304	FAG	Ball	20	52	15	16 kN	0.153
NJ304-E-TVP2	FAG	Cylindrical Roller	20	52	15	36.5 kN	0.156
NJ304-E-XL-TVP2	FAG	Cylindrical Roller	20	52	15	37.5 kN	0.156
NU304-E-TVP2	FAG	Cylindrical Roller	20	52	15	36.5 kN	0.153

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1304	NSK	Ball	20	52	15	2,810 lbs	0.172
6304	NSK	Ball	20	52	15	3,580 lbs	0.145
7304B	NSK	Ball	20	52	15	3,640 lbs	0.15
30304	NSK	Tapered Roller	20	52	15	31 kN	0.168
HR30304	NSK	Tapered Roller	20	52	15	43 kN	0.172
HR30304J	NSK	Tapered Roller	20	52	15	7,870 lbs	0.172
7304	NSK	Precision / Angular Contact	20	52	15	20.6 kN	0.146

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
21305CDE4	NSK	Spherical Roller	25	62	17	43 kN	0.26
21306CDE4	NSK	Spherical Roller	25	72	19	55 kN	0.39
21307CDE4	NSK	Spherical Roller	25	80	21	71.5 kN	0.53
22205CE4	NSK	Spherical Roller	25	52	18	37.5 kN	0.17

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