6818NSKBall

Name: NSK 6818 Ball Bearing
Brand: NSK
SKU: 6818

6818 is a NSK ball bearing, bore 90 mm, O.D. 115 mm, width 13 mm, dynamic rating 4,270 lbs. Dimensions, drawing, interchanges and price.

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Bore d90mm

Outside dia. D115mm

Width B13mm

Dynamic Cr4,270lbs

Static C0r4,710lbs

Limiting speed5,300rpm

Weight0.268kg

Cr / C0r0.91

Mean dia. dm102.5mm

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	90	3.5433
D	Outside diameter	115	4.5276
B	Inner-ring / bearing width	13	0.5118
r	Chamfer (min)	0.991	0.039

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)	90
Bore d (in)	3.5433
Outside dia. D (mm)	115
Outside dia. D (in)	4.5276
Width B (mm)	13
Width B (in)	0.5118

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	4270
Basic static load rating Cor (lbs)	4710
Limiting speed - grease (rpm)	5,300
Limiting speed - oil (rpm)	6,300
Factor f0	17.2

Weight

Weight (kg)	0.268

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	3.740
Shaft shoulder da max (in)	3.760
Housing shoulder Da max (in)	4.331

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,700 rpm
4	4,748	64	627
6	3,166	216	2,118
8	2,374	512	5,020
10	1,899	1,000	9,804
15	1,266	3,375	33,088

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 18,994 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
61818-2RSR-Y	FAG	Ball	90	115	13	20.7 kN	0.28
61818-2RZ-Y	FAG	Ball	90	115	13	20.7 kN	0.28
61818-2Z-Y	FAG	Ball	90	115	13	19.6 kN	0.28
61818-Y	FAG	Ball	90	115	13	20.7 kN	0.28

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1218	NSK	Ball	90	160	30	63 kN	2.56
1318	NSK	Ball	90	190	43	129 kN	5.83
16018	NSK	Ball	90	140	16	45.5 kN	0.873
6018	NSK	Ball	90	140	24	13,100 lbs	1.161
6218	NSK	Ball	90	160	30	21,600 lbs	2.15
6318	NSK	Ball	90	190	43	32,100 lbs	4.899
6918	NSK	Ball	90	125	18	7,370 lbs	0.567
7218B	NSK	Ball	90	160	30	22,900 lbs	2.549

Request a quotation for 6818

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