6940NSKBall

Name: NSK 6940 Ball Bearing
Brand: NSK
SKU: 6940

6940 is a NSK ball bearing, bore 200 mm, O.D. 280 mm, width 38 mm, dynamic rating 32,100 lbs. Dimensions, drawing, interchanges and price.

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Bore d200mm

Outside dia. D280mm

Width B38mm

Dynamic Cr32,100lbs

Static C0r35,400lbs

Limiting speed2,000rpm

Weight7.176kg

Cr / C0r0.91

Mean dia. dm240mm

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	200	7.874
D	Outside diameter	280	11.0236
B	Inner-ring / bearing width	38	1.4961
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)	200
Bore d (in)	7.8740
Outside dia. D (mm)	280
Outside dia. D (in)	11.0236
Width B (mm)	38
Width B (in)	1.4961

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	32100
Basic static load rating Cor (lbs)	35400
Limiting speed - grease (rpm)	2,000
Limiting speed - oil (rpm)	2,400
Factor f0	16.4

Weight

Weight (kg)	7.176

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.079
Shaft shoulder da min (in)	8.307
Shaft shoulder da max (in)	8.740
Housing shoulder Da max (in)	10.591

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 600 rpm
4	35,697	64	1,778
6	23,798	216	6,000
8	17,848	512	14,222
10	14,279	1,000	27,778
15	9,519	3,375	93,750

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 142,788 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
61940	FAG	Ball	200	280	38	158 kN	6.27
B71940-C-T-P4S	FAG	Precision / Angular Contact	200	280	38	204 kN	6.03
B71940-E-T-P4S	FAG	Precision / Angular Contact	200	280	38	193 kN	6.01

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
7940A5	NSK	Precision / Angular Contact	200	280	38	40,100 lbs	6.922
7940C	NSK	Precision / Angular Contact	200	280	38	42,500 lbs	6.849

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
6840	NSK	Ball	200	250	24	16,600 lbs	2.654
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 6940

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