6304NSKBall

Name: NSK 6304 Ball Bearing
Brand: NSK
SKU: 6304

6304 is a NSK ball bearing, bore 20 mm, O.D. 52 mm, width 15 mm, dynamic rating 3,580 lbs. Dimensions, drawing, interchanges and price.

Request a quote WhatsApp Email us Search the catalog

Bore d20mm

Outside dia. D52mm

Width B15mm

Dynamic Cr3,580lbs

Static C0r1,770lbs

Limiting speed14,000rpm

Weight0.145kg

Cr / C0r2.02

Mean dia. dm36mm

Original catalogue drawing - NSK catalogue, page 19

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)	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)	20
Bore d (in)	0.7874
Outside dia. D (mm)	52
Outside dia. D (in)	2.0472
Width B (mm)	15
Width B (in)	0.5906

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	3580
Basic static load rating Cor (lbs)	1770
Limiting speed - grease (rpm)	14,000
Limiting speed - oil (rpm)	17,000
Factor f0	12.4

Weight

Weight (kg)	0.145

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	1.016
Shaft shoulder da max (in)	1.103
Housing shoulder Da max (in)	1.772

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 3,000 rpm
4	3,981	64	356
6	2,654	216	1,200
8	1,991	512	2,844
10	1,592	1,000	5,556
15	1,062	3,375	18,750

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 15,925 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.21 (dimensions) / p.22 (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
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
7304B	NSK	Ball	20	52	15	3,640 lbs	0.15
21304CDE4	NSK	Spherical Roller	20	52	15	29.3 kN	0.17
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
1204	NSK	Ball	20	47	14	2,250 lbs	0.118
1304	NSK	Ball	20	52	15	2,810 lbs	0.172
16004	NSK	Ball	20	42	8	8.7 kN	0.048
2204	NSK	Ball	20	47	18	3,210 lbs	0.141
2304	NSK	Ball	20	52	21	4,050 lbs	0.236
3204J	NSK	Ball	20	47	20.6	3,960 lbs	0.168
3304J	NSK	Ball	20	52	22.2	4,610 lbs	0.231
5204J	NSK	Ball	20	47	20.6	4,410 lbs	0.118

Request a quotation for 6304

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