HR303/28NSKTapered Roller

Name: NSK HR303/28 Tapered Roller Bearing
Brand: NSK
SKU: HR303/28

HR303/28 is a NSK tapered roller bearing, bore 28 mm, O.D. 68 mm, width 18 mm, dynamic rating 12,400 lbs. Dimensions, drawing, interchanges and price.

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Bore d28mm

Outside dia. D68mm

Width B18mm

Dynamic Cr12,400lbs

Static C0r12,500lbs

Limiting speed6,000rpm

Weight0.34kg

Cr / C0r0.99

Mean dia. dm48mm

Original catalogue drawing - NSK catalogue, page 107

HR303/28 NSK Tapered 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	28	1.1024
D	Outside diameter	68	2.6772
B	Inner-ring / bearing width	18	0.7087
T	Overall assembly width	19.75	0.7776
C	Cup / outer-ring width	15	0.5906

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)	28
Bore d (in)	1.1024
Outside dia. D (mm)	68
Outside dia. D (in)	2.6772
Width B (mm)	18
Width B (in)	0.7087
Overall width T (mm)	19.75
Overall width T (in)	0.7776
Cup width C (mm)	15
Cup width C (in)	0.5906

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	12400
Basic static load rating Cor (lbs)	12500
Limiting speed - grease (rpm)	6,000
Limiting speed - oil (rpm)	8,000

Weight

Weight (kg)	0.34

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.06
Shaft shoulder da min (in)	1.535
Housing shoulder Da max (in)	2.323
Shaft shoulder db max (in)	1.457

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,000 rpm
4	13,789	102	847
6	9,193	392	3,271
8	6,895	1,024	8,533
10	5,516	2,154	17,954
15	3,677	8,323	69,362

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 55,158 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.109 (dimensions) / p.110 (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
303/28	FAG	Tapered Roller	28	68	18	53 kN	0.342

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
63/28	NSK	Ball	28	68	18	29.4 kN	0.287
HR303/28C	NSK	Tapered Roller	28	68	18	11,100 lbs	0.336

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
HR303/22	NSK	Tapered Roller	22	56	16	8,320 lbs	0.209
HR303/22C	NSK	Tapered Roller	22	56	16	7,760 lbs	0.2
HR303/28C	NSK	Tapered Roller	28	68	18	11,100 lbs	0.336
HR303/32	NSK	Tapered Roller	32	75	20	14,600 lbs	0.445
HR303/32C	NSK	Tapered Roller	32	75	20	13,400 lbs	0.445

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
HR302/28C	NSK	Tapered Roller	28	58	16	7,640 lbs	0.202
HR320/28XJ	NSK	Tapered Roller	28	52	16	32,000 lbs	0.145
HR322/28	NSK	Tapered Roller	28	58	19	10,700 lbs	0.245
HR322/28C	NSK	Tapered Roller	28	58	19	9,440 lbs	0.24
HR323/28C	NSK	Tapered Roller	28	68	24	14,400 lbs	0.445
L45449/L45410	NSK	Tapered Roller	29	50.29	14.73	6,010 lbs	0.113
L44649/L44610	NSK	Tapered Roller	26.99	50.29	14.73	6,210 lbs	0.113
15117/15245	NSK	Tapered Roller	30	62	20.64	10,400 lbs	0.263

Request a quotation for HR303/28

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