6840NSKBall

Name: NSK 6840 Ball Bearing
Brand: NSK
SKU: 6840

6840 is a NSK ball bearing, bore 200 mm, O.D. 250 mm, width 24 mm, dynamic rating 16,600 lbs. Dimensions, drawing, interchanges and price.

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Bore d200mm

Outside dia. D250mm

Width B24mm

Dynamic Cr16,600lbs

Static C0r22,000lbs

Limiting speed2,200rpm

Weight2.654kg

Cr / C0r0.75

Mean dia. dm225mm

Original catalogue drawing - NSK catalogue, page 21

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	200	7.874
D	Outside diameter	250	9.8425
B	Inner-ring / bearing width	24	0.9449
r	Chamfer (min)	1.499	0.059

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)	200
Bore d (in)	7.8740
Outside dia. D (mm)	250
Outside dia. D (in)	9.8425
Width B (mm)	24
Width B (in)	0.9449

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	16600
Basic static load rating Cor (lbs)	22000
Limiting speed - grease (rpm)	2,200
Limiting speed - oil (rpm)	2,600
Factor f0	17.2

Weight

Weight (kg)	2.654

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.059
Shaft shoulder da min (in)	8.189
Shaft shoulder da max (in)	-
Housing shoulder Da max (in)	9.528

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 700 rpm
4	18,460	64	1,524
6	12,307	216	5,143
8	9,230	512	12,190
10	7,384	1,000	23,810
15	4,923	3,375	80,357

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 73,840 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.23 (dimensions) / p.24 (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
61840	FAG	Ball	200	250	24	74 kN	2.35
SL181840	FAG	Cylindrical Roller	200	250	24	178 kN	2.57

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
NCF1840V	NSK	Cylindrical Roller	200	250	24	224 kN	2.5

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
16040	NSK	Ball	200	310	34	177 kN	10
6040	NSK	Ball	200	310	51	46,500 lbs	14.061
6240	NSK	Ball	200	360	58	296 kN	26.7
6340	NSK	Ball	200	420	80	85,300 lbs	57.606
6940	NSK	Ball	200	280	38	32,100 lbs	7.176
7240B	NSK	Ball	200	360	58	68,300 lbs	25.31
7340B	NSK	Ball	200	420	80	97,000 lbs	53.07

Request a quotation for 6840

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