6908NSKBall

Name: NSK 6908 Ball Bearing
Brand: NSK
SKU: 6908

6908 is a NSK ball bearing, bore 40 mm, O.D. 62 mm, width 12 mm, dynamic rating 3,060 lbs. Dimensions, drawing, interchanges and price.

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Bore d40mm

Outside dia. D62mm

Width B12mm

Dynamic Cr3,060lbs

Static C0r2,240lbs

Limiting speed11,000rpm

Weight0.109kg

Cr / C0r1.37

Mean dia. dm51mm

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	40	1.5748
D	Outside diameter	62	2.4409
B	Inner-ring / bearing width	12	0.4724
r	Chamfer (min)	0.61	0.024

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)	40
Bore d (in)	1.5748
Outside dia. D (mm)	62
Outside dia. D (in)	2.4409
Width B (mm)	12
Width B (in)	0.4724

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	3060
Basic static load rating Cor (lbs)	2240
Limiting speed - grease (rpm)	11,000
Limiting speed - oil (rpm)	13,000
Factor f0	15.7

Weight

Weight (kg)	0.109

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.024
Shaft shoulder da min (in)	1.732
Shaft shoulder da max (in)	1.811
Housing shoulder Da max (in)	2.283

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 3,000 rpm
4	3,403	64	356
6	2,269	216	1,200
8	1,701	512	2,844
10	1,361	1,000	5,556
15	907	3,375	18,750

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 13,612 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
61908	FAG	Ball	40	62	12	14.5 kN	0.117
61908-2RSR	FAG	Ball	40	62	12	14.5 kN	0.11
61908-2Z	FAG	Ball	40	62	12	14.5 kN	0.11
B71908-C-T-P4S	FAG	Precision / Angular Contact	40	62	12	17.6 kN	0.113
B71908-E-T-P4S	FAG	Precision / Angular Contact	40	62	12	16.6 kN	0.113
HCB71908-C-T-P4S	FAG	Precision / Angular Contact	40	62	12	12.2 kN	0.11
HCB71908-E-T-P4S	FAG	Precision / Angular Contact	40	62	12	11.4 kN	0.11
HCS71908-C-T-P4S	FAG	Precision / Angular Contact	40	62	12	5 kN	0.122
HCS71908-E-T-P4S	FAG	Precision / Angular Contact	40	62	12	4.8 kN	0.122
HSS71908-C-T-P4S	FAG	Precision / Angular Contact	40	62	12	7.2 kN	0.122

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
7908A5	NSK	Precision / Angular Contact	40	62	12	3,220 lbs	0.109
7908C	NSK	Precision / Angular Contact	40	62	12	3,400 lbs	0.109

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1208	NSK	Ball	40	80	18	4,340 lbs	0.417
1308	NSK	Ball	40	90	23	6,520 lbs	0.744
16008	NSK	Ball	40	68	9	13.9 kN	0.13
2208	NSK	Ball	40	80	23	7,080 lbs	0.49
2308	NSK	Ball	40	90	33	10,100 lbs	0.998
3208J	NSK	Ball	40	80	30.2	9,290 lbs	0.653
3308J	NSK	Ball	40	90	36.5	13,100 lbs	1.066
5208J	NSK	Ball	40	80	30.2	9,930 lbs	0.572

Request a quotation for 6908

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