6338NSKBall

Name: NSK 6338 Ball Bearing
Brand: NSK
SKU: 6338

6338 is a NSK ball bearing, bore 190 mm, O.D. 400 mm, width 78 mm, dynamic rating 79,700 lbs. Dimensions, drawing, interchanges and price.

Request a quote WhatsApp Email us Search the catalog

Bore d190mm

Outside dia. D400mm

Width B78mm

Dynamic Cr79,700lbs

Static C0r93,200lbs

Limiting speed1,400rpm

Weight50.802kg

Cr / C0r0.86

Mean dia. dm295mm

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	190	7.4803
D	Outside diameter	400	15.748
B	Inner-ring / bearing width	78	3.0709
r	Chamfer (min)	3.988	0.157

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

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	79700
Basic static load rating Cor (lbs)	93200
Limiting speed - grease (rpm)	1,400
Limiting speed - oil (rpm)	1,700
Factor f0	14.1

Weight

Weight (kg)	50.802

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.157
Shaft shoulder da min (in)	8.346
Shaft shoulder da max (in)	-
Housing shoulder Da max (in)	14.882

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 400 rpm
4	88,631	64	2,667
6	59,087	216	9,000
8	44,315	512	21,333
10	35,452	1,000	41,667
15	23,635	3,375	140,625

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 354,523 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
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
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
30338	NSK	Tapered Roller	190	400	78	227,000 lbs	46.008
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
16038	NSK	Ball	190	290	31	164 kN	7.78
6038	NSK	Ball	190	290	46	42,300 lbs	11.113
6238	NSK	Ball	190	340	55	57,300 lbs	22.153
6838	NSK	Ball	190	240	24	16,400 lbs	2.527
6938	NSK	Ball	190	260	33	25,300 lbs	5.13
7238B	NSK	Ball	190	340	55	63,700 lbs	21.319
7338B	NSK	Ball	190	400	78	92,600 lbs	47.174

Request a quotation for 6338

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