318NSKCylindrical Roller

Name: NSK 318 Cylindrical Roller Bearing
Brand: NSK
SKU: 318

318 is a NSK cylindrical roller bearing, bore 90 mm, O.D. 190 mm, width 43 mm, dynamic rating 53,900 lbs. Dimensions, drawing, interchanges and price.

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Bore d90mm

Outside dia. D190mm

Width B43mm

Dynamic Cr53,900lbs

Static C0r59,600lbs

Limiting speed3,200rpm

Weight5.443kg

Cr / C0r0.9

Mean dia. dm140mm

Original catalogue drawing - NSK catalogue, page 55

318 NSK Cylindrical Roller bearing catalogue drawing

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

Notes

Cylindrical roller entries from the NSK inch catalogue are series numbers covering the N / NU / NJ / NUP / NH prefixes of the same size. 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)	53900
Basic static load rating Cor (lbs)	59600
Limiting speed - grease (rpm)	3,200
Limiting speed - oil (rpm)	3,800

Weight

Weight (kg)	5.443

Mounting dimensions (fillets / shoulders)

Fillet ra max (in)	0.099
Fillet rb max (in)	0.098
Shaft shoulder da min (in)	4.055
Housing shoulder Da max (in)	6.929
Shaft shoulder db min (in)	4.055
Shaft shoulder db max (in)	4.409
Housing shoulder Db min (in)	6.614
Housing shoulder Db max (in)	6.969

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,000 rpm
4	59,940	102	1,693
6	39,960	392	6,542
8	29,970	1,024	17,067
10	23,976	2,154	35,907
15	15,984	8,323	138,724

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 239,759 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.57 (dimensions) / p.58 (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
6318	NSK	Ball	90	190	43	32,100 lbs	4.899
7318B	NSK	Ball	90	190	43	33,100 lbs	5.851
BL318	NSK	Ball	90	190	43	42,000 lbs	5.371
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
1018	NSK	Cylindrical Roller	90	140	24	19,800 lbs	1.329
218	NSK	Cylindrical Roller	90	160	30	34,100 lbs	2.35
2218	NSK	Cylindrical Roller	90	160	40	46,400 lbs	3.152
2318	NSK	Cylindrical Roller	90	190	64	73,700 lbs	8.165
418	NSK	Cylindrical Roller	90	225	54	83,600 lbs	11.34
NU1018	NSK	Cylindrical Roller	90	140	24	108 kN	1.35
NU218E	NSK	Cylindrical Roller	90	160	30	224 kN	2.6
NU2318E	NSK	Cylindrical Roller	90	190	64	535 kN	7.9

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