6918NSKBall

Name: NSK 6918 Ball Bearing
Brand: NSK
SKU: 6918

6918 is a NSK ball bearing, bore 90 mm, O.D. 125 mm, width 18 mm, dynamic rating 7,370 lbs. Dimensions, drawing, interchanges and price.

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Bore d90mm

Outside dia. D125mm

Width B18mm

Dynamic Cr7,370lbs

Static C0r7,040lbs

Limiting speed5,000rpm

Weight0.567kg

Cr / C0r1.05

Mean dia. dm107.5mm

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	90	3.5433
D	Outside diameter	125	4.9213
B	Inner-ring / bearing width	18	0.7087
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)	125
Outside dia. D (in)	4.9213
Width B (mm)	18
Width B (in)	0.7087

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	7370
Basic static load rating Cor (lbs)	7040
Limiting speed - grease (rpm)	5,000
Limiting speed - oil (rpm)	6,000
Factor f0	16.5

Weight

Weight (kg)	0.567

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.039
Shaft shoulder da min (in)	3.799
Shaft shoulder da max (in)	3.878
Housing shoulder Da max (in)	4.665

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,600 rpm
4	8,196	64	667
6	5,464	216	2,250
8	4,098	512	5,333
10	3,278	1,000	10,417
15	2,186	3,375	35,156

Basic rating life per ISO 281: L₁₀ = (C/P)³ with C = 32,783 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
61918	FAG	Ball	90	125	18	33.5 kN	0.59
B71918-C-T-P4S	FAG	Precision / Angular Contact	90	125	18	45.5 kN	0.558
B71918-E-T-P4S	FAG	Precision / Angular Contact	90	125	18	43 kN	0.556
HCB71918-C-T-P4S	FAG	Precision / Angular Contact	90	125	18	31.5 kN	0.55
HCB71918-E-T-P4S	FAG	Precision / Angular Contact	90	125	18	30 kN	0.55
HCS71918-C-T-P4S	FAG	Precision / Angular Contact	90	125	18	16.3 kN	0.588
HCS71918-E-T-P4S	FAG	Precision / Angular Contact	90	125	18	15.6 kN	0.587
HSS71918-C-T-P4S	FAG	Precision / Angular Contact	90	125	18	23.6 kN	0.589
HSS71918-E-T-P4S	FAG	Precision / Angular Contact	90	125	18	22.4 kN	0.588

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
7918A5	NSK	Precision / Angular Contact	90	125	18	8,820 lbs	0.558
7918C	NSK	Precision / Angular Contact	90	125	18	9,370 lbs	0.553

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
6818	NSK	Ball	90	115	13	4,270 lbs	0.268
7218B	NSK	Ball	90	160	30	22,900 lbs	2.549

Request a quotation for 6918

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