6238NSKBall

Name: NSK 6238 Ball Bearing
Brand: NSK
SKU: 6238

6238 is a NSK ball bearing, bore 190 mm, O.D. 340 mm, width 55 mm, dynamic rating 57,300 lbs. Dimensions, drawing, interchanges and price.

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Bore d190mm

Outside dia. D340mm

Width B55mm

Dynamic Cr57,300lbs

Static C0r63,300lbs

Limiting speed1,600rpm

Weight22.153kg

Cr / C0r0.91

Mean dia. dm265mm

Original catalogue drawing - NSK catalogue, page 17

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
r	Chamfer (min)	2.997	0.118

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

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	57300
Basic static load rating Cor (lbs)	63300
Limiting speed - grease (rpm)	1,600
Limiting speed - oil (rpm)	2,000
Factor f0	15.0

Weight

Weight (kg)	22.153

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.118
Shaft shoulder da min (in)	8.150
Shaft shoulder da max (in)	9.298
Housing shoulder Da max (in)	12.717

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 500 rpm
4	63,721	64	2,133
6	42,481	216	7,200
8	31,860	512	17,067
10	25,488	1,000	33,333
15	16,992	3,375	112,500

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 254,883 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.19 (dimensions) / p.20 (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
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
30238	NSK	Tapered Roller	190	340	55	130,000 lbs	20.103
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
16038	NSK	Ball	190	290	31	164 kN	7.78
6038	NSK	Ball	190	290	46	42,300 lbs	11.113
6338	NSK	Ball	190	400	78	79,700 lbs	50.802
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 6238

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