6938NSKBall

Name: NSK 6938 Ball Bearing
Brand: NSK
SKU: 6938

6938 is a NSK ball bearing, bore 190 mm, O.D. 260 mm, width 33 mm, dynamic rating 25,300 lbs. Dimensions, drawing, interchanges and price.

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Bore d190mm

Outside dia. D260mm

Width B33mm

Dynamic Cr25,300lbs

Static C0r28,600lbs

Limiting speed2,200rpm

Weight5.13kg

Cr / C0r0.88

Mean dia. dm225mm

Original catalogue drawing - NSK catalogue, page 23

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	260	10.2362
B	Inner-ring / bearing width	33	1.2992
r	Chamfer (min)	2.007	0.079

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)	260
Outside dia. D (in)	10.2362
Width B (mm)	33
Width B (in)	1.2992

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	25300
Basic static load rating Cor (lbs)	28600
Limiting speed - grease (rpm)	2,200
Limiting speed - oil (rpm)	2,600
Factor f0	16.6

Weight

Weight (kg)	5.13

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.079
Shaft shoulder da min (in)	7.835
Shaft shoulder da max (in)	-
Housing shoulder Da max (in)	9.882

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 700 rpm
4	28,135	64	1,524
6	18,757	216	5,143
8	14,068	512	12,190
10	11,254	1,000	23,810
15	7,503	3,375	80,357

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 112,540 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.25 (dimensions) / p.26 (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
61938	FAG	Ball	190	260	33	140 kN	4.39
B71938-C-T-P4S	FAG	Precision / Angular Contact	190	260	33	166 kN	4.31
B71938-E-T-P4S	FAG	Precision / Angular Contact	190	260	33	156 kN	4.29

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
7938A5	NSK	Precision / Angular Contact	190	260	33	31,100 lbs	5.121
7938C	NSK	Precision / Angular Contact	190	260	33	33,100 lbs	5.062

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
6338	NSK	Ball	190	400	78	79,700 lbs	50.802
6838	NSK	Ball	190	240	24	16,400 lbs	2.527
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 6938

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