30238NSKTapered Roller

Name: NSK 30238 Tapered Roller Bearing
Brand: NSK
SKU: 30238

30238 is a NSK tapered roller bearing, bore 190 mm, O.D. 340 mm, width 55 mm, dynamic rating 130,000 lbs. Dimensions, drawing, interchanges and price.

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Bore d190mm

Outside dia. D340mm

Width B55mm

Dynamic Cr130,000lbs

Static C0r178,000lbs

Limiting speed1,000rpm

Weight20.103kg

Cr / C0r0.73

Mean dia. dm265mm

Original catalogue drawing - NSK catalogue, page 105

30238 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	190	7.4803
D	Outside diameter	340	13.3858
B	Inner-ring / bearing width	55	2.1654
T	Overall assembly width	60	2.3622
C	Cup / outer-ring width	46	1.811

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)	190
Bore d (in)	7.4803
Outside dia. D (mm)	340
Outside dia. D (in)	13.3858
Width B (mm)	55
Width B (in)	2.1654
Overall width T (mm)	60
Overall width T (in)	2.3622
Cup width C (mm)	46
Cup width C (in)	1.8110

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	130000
Basic static load rating Cor (lbs)	178000
Limiting speed - grease (rpm)	1,000
Limiting speed - oil (rpm)	1,300

Weight

Weight (kg)	20.103

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.12
Shaft shoulder da min (in)	8.543
Housing shoulder Da max (in)	12.677
Shaft shoulder db max (in)	8.976

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 300 rpm
4	144,567	102	5,644
6	96,378	392	21,805
8	72,284	1,024	56,889
10	57,827	2,154	119,691
15	38,551	8,323	462,415

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 578,269 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
6238-M	FAG	Ball	190	340	55	255 kN	22.6
QJ238-N2-MPA	FAG	Ball	190	340	55	455 kN	23.8
N238-E-M1	FAG	Cylindrical Roller	190	340	55	680 kN	22.8
NJ238-E-M1	FAG	Cylindrical Roller	190	340	55	680 kN	23.2
NU238-E-M1	FAG	Cylindrical Roller	190	340	55	680 kN	22.8
NUP238-E-M1	FAG	Cylindrical Roller	190	340	55	680 kN	23.5
20238-MB	FAG	Spherical Roller	190	340	55	650 kN	22.5
30238	FAG	Tapered Roller	190	340	55	530 kN	20.8
30238-XL	FAG	Tapered Roller	190	340	55	800 kN	21.4
B7238-C-T-P4S	FAG	Precision / Angular Contact	190	340	55	315 kN	20

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
6238	NSK	Ball	190	340	55	57,300 lbs	22.153
7238B	NSK	Ball	190	340	55	63,700 lbs	21.319
238	NSK	Cylindrical Roller	190	340	55	124,000 lbs	22.226
NU238E	NSK	Cylindrical Roller	190	340	55	855 kN	23
HR30238	NSK	Tapered Roller	190	340	55	880 kN	21.4
7238	NSK	Precision / Angular Contact	190	340	55	345 kN	22.4
7238A5	NSK	Precision / Angular Contact	190	340	55	73,900 lbs	22.303
7238C	NSK	Precision / Angular Contact	190	340	55	77,200 lbs	22.104

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
30338	NSK	Tapered Roller	190	400	78	227,000 lbs	46.008
32338	NSK	Tapered Roller	190	400	132	2040 kN	78.9
HR30238	NSK	Tapered Roller	190	340	55	880 kN	21.4
HR32038	NSK	Tapered Roller	190	290	64	800 kN	14.9
HR32038XJ	NSK	Tapered Roller	190	290	64	650,000 lbs	14.901
HR32238	NSK	Tapered Roller	190	340	92	1370 kN	35.2
HR32238J	NSK	Tapered Roller	190	340	92	250,000 lbs	35.181
HR32938	NSK	Tapered Roller	190	260	45	445 kN	6.83

Request a quotation for 30238

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