30248NSKTapered Roller

Name: NSK 30248 Tapered Roller Bearing
Brand: NSK
SKU: 30248

30248 is a NSK tapered roller bearing, bore 240 mm, O.D. 440 mm, width 72 mm, dynamic rating 223,000 lbs. Dimensions, drawing, interchanges and price.

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Bore d240mm

Outside dia. D440mm

Width B72mm

Dynamic Cr223,000lbs

Static C0r315,000lbs

Limiting speed750rpm

Weight45.21kg

Cr / C0r0.71

Mean dia. dm340mm

Original catalogue drawing - NSK catalogue, page 105

30248 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	240	9.4488
D	Outside diameter	440	17.3228
B	Inner-ring / bearing width	72	2.8346
T	Overall assembly width	79	3.1102
C	Cup / outer-ring width	60	2.3622

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)	240
Bore d (in)	9.4488
Outside dia. D (mm)	440
Outside dia. D (in)	17.3228
Width B (mm)	72
Width B (in)	2.8346
Overall width T (mm)	79
Overall width T (in)	3.1102
Cup width C (mm)	60
Cup width C (in)	2.3622

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	223000
Basic static load rating Cor (lbs)	315000
Limiting speed - grease (rpm)	750
Limiting speed - oil (rpm)	1,000

Weight

Weight (kg)	45.21

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.12
Shaft shoulder da min (in)	10.512
Housing shoulder Da max (in)	16.614
Shaft shoulder db max (in)	11.339

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 200 rpm
4	247,988	102	8,466
6	165,326	392	32,708
8	123,994	1,024	85,333
10	99,195	2,154	179,536
15	66,130	8,323	693,622

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 991,953 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.107 (dimensions) / p.108 (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
6248-M	FAG	Ball	240	440	72	360 kN	51.3
QJ248-N2-MPA	FAG	Ball	240	440	72	680 kN	53.1
N248-E-M1	FAG	Cylindrical Roller	240	440	72	1140 kN	51.5
N248-E-TB-M1	FAG	Cylindrical Roller	240	440	72	1160 kN	51.5
NJ248-E-M1	FAG	Cylindrical Roller	240	440	72	1140 kN	52.5
NJ248-E-TB-M1	FAG	Cylindrical Roller	240	440	72	1140 kN	52.5
NU248-E-M1	FAG	Cylindrical Roller	240	440	72	1140 kN	51.8
NU248-E-TB-M1	FAG	Cylindrical Roller	240	440	72	1140 kN	51.8
30248-XL	FAG	Tapered Roller	240	440	72	1030 kN	47.5

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
6248	NSK	Ball	240	440	72	375 kN	50.5
248	NSK	Cylindrical Roller	240	440	72	210,000 lbs	50.349

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
30348	NSK	Tapered Roller	240	500	95	373,000 lbs	92.614
32248	NSK	Tapered Roller	240	440	120	366,000 lbs	78.05
32348	NSK	Tapered Roller	240	500	155	567,000 lbs	145.027
HR32048	NSK	Tapered Roller	240	360	76	1130 kN	26.2
HR32048XJ	NSK	Tapered Roller	240	360	76	920,000 lbs	26.204
HR32948	NSK	Tapered Roller	240	320	51	615 kN	11.1
HR32948J	NSK	Tapered Roller	240	320	51	112,000 lbs	11.104

Request a quotation for 30248

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