30338NSKTapered Roller

Name: NSK 30338 Tapered Roller Bearing
Brand: NSK
SKU: 30338

30338 is a NSK tapered roller bearing, bore 190 mm, O.D. 400 mm, width 78 mm, dynamic rating 227,000 lbs. Dimensions, drawing, interchanges and price.

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Bore d190mm

Outside dia. D400mm

Width B78mm

Dynamic Cr227,000lbs

Static C0r301,000lbs

Limiting speed850rpm

Weight46.008kg

Cr / C0r0.75

Mean dia. dm295mm

Original catalogue drawing - NSK catalogue, page 107

30338 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	400	15.748
B	Inner-ring / bearing width	78	3.0709
T	Overall assembly width	86	3.3858
C	Cup / outer-ring width	65	2.5591

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)	400
Outside dia. D (in)	15.7480
Width B (mm)	78
Width B (in)	3.0709
Overall width T (mm)	86
Overall width T (in)	3.3858
Cup width C (mm)	65
Cup width C (in)	2.5591

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	227000
Basic static load rating Cor (lbs)	301000
Limiting speed - grease (rpm)	850
Limiting speed - oil (rpm)	1,200

Weight

Weight (kg)	46.008

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.16
Shaft shoulder da min (in)	8.780
Housing shoulder Da max (in)	14.882
Shaft shoulder db max (in)	9.764

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 200 rpm
4	252,437	102	8,466
6	168,291	392	32,708
8	126,218	1,024	85,333
10	100,975	2,154	179,536
15	67,316	8,323	693,622

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 1,009,746 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
6338-M	FAG	Ball	190	400	78	375 kN	50.4
QJ338-N2-MPA	FAG	Ball	190	400	78	735 kN	52.1
NU338-E-M1	FAG	Cylindrical Roller	190	400	78	1120 kN	50.6
NU338-E-TB-M1	FAG	Cylindrical Roller	190	400	78	1120 kN	50.6
30338	FAG	Tapered Roller	190	400	78	1210 kN	46.7

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
6338	NSK	Ball	190	400	78	79,700 lbs	50.802
7338B	NSK	Ball	190	400	78	92,600 lbs	47.174
338	NSK	Cylindrical Roller	190	400	78	219,000 lbs	49.442
NU338E	NSK	Cylindrical Roller	190	400	78	1300 kN	50.6
7338	NSK	Precision / Angular Contact	190	400	78	495 kN	47.5

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
30238	NSK	Tapered Roller	190	340	55	130,000 lbs	20.103
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 30338

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