6318NSKBall

Name: NSK 6318 Ball Bearing
Brand: NSK
SKU: 6318

6318 is a NSK ball bearing, bore 90 mm, O.D. 190 mm, width 43 mm, dynamic rating 32,100 lbs. Dimensions, drawing, interchanges and price.

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Bore d90mm

Outside dia. D190mm

Width B43mm

Dynamic Cr32,100lbs

Static C0r24,100lbs

Limiting speed3,600rpm

Weight4.899kg

Cr / C0r1.33

Mean dia. dm140mm

Original catalogue drawing - NSK catalogue, page 19

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	190	7.4803
B	Inner-ring / bearing width	43	1.6929
r	Chamfer (min)	2.489	0.098

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)	190
Outside dia. D (in)	7.4803
Width B (mm)	43
Width B (in)	1.6929

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	32100
Basic static load rating Cor (lbs)	24100
Limiting speed - grease (rpm)	3,600
Limiting speed - oil (rpm)	4,300
Factor f0	13.3

Weight

Weight (kg)	4.899

Mounting dimensions (fillets / shoulders)

Chamfer r (in)	0.098
Shaft shoulder da min (in)	4.094
Shaft shoulder da max (in)	4.610
Housing shoulder Da max (in)	6.929

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,200 rpm
4	35,697	64	889
6	23,798	216	3,000
8	17,848	512	7,111
10	14,279	1,000	13,889
15	9,519	3,375	46,875

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.21 (dimensions) / p.22 (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
1318-K-M-C3	FAG	Ball	90	190	43	109 kN	6.27
1318-M	FAG	Ball	90	190	43	109 kN	6.35
6318	FAG	Ball	90	190	43	142 kN	5.43
6318-2RSR	FAG	Ball	90	190	43	142 kN	5.396
6318-2Z	FAG	Ball	90	190	43	142 kN	5.53
QJ318-N2-MPA	FAG	Ball	90	190	43	265 kN	6.31
N318-E-M1	FAG	Cylindrical Roller	90	190	43	370 kN	6.19
N318-E-XL-M1	FAG	Cylindrical Roller	90	190	43	370 kN	6.19
NJ318-E-TVP2	FAG	Cylindrical Roller	90	190	43	370 kN	5.49
NJ318-E-XL-TVP2	FAG	Cylindrical Roller	90	190	43	370 kN	5.49

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1318	NSK	Ball	90	190	43	129 kN	5.83
7318B	NSK	Ball	90	190	43	33,100 lbs	5.851
BL318	NSK	Ball	90	190	43	42,000 lbs	5.371
318	NSK	Cylindrical Roller	90	190	43	53,900 lbs	5.443
NU318	NSK	Cylindrical Roller	90	190	43	295 kN	5.38
NU318E	NSK	Cylindrical Roller	90	190	43	390 kN	6.1
21318EAE4	NSK	Spherical Roller	90	190	43	415 kN	6.1
HR30318	NSK	Tapered Roller	90	190	43	325 kN	5.52

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
6818	NSK	Ball	90	115	13	4,270 lbs	0.268
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 6318

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