20318-MBFAGSpherical Roller

Name: FAG 20318-MB Spherical Roller Bearing
Brand: FAG
SKU: 20318-MB

20318-MB is a FAG spherical roller bearing, bore 90 mm, O.D. 190 mm, width 43 mm, dynamic rating 300 kN. Dimensions, drawing, interchanges and price.

Brass cage

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Bore d90mm

Outside dia. D190mm

Width B43mm

Dynamic Cr300kN

Static C0r360kN

Limiting speed3,500rpm

Weight6.25kg

Cr / C0r0.83

Mean dia. dm140mm

Original catalogue drawing - FAG Schaeffler HR 1, page 656

20318-MB FAG Spherical 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
r	Chamfer (min)	3	0.1181

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
Outside dia. D (mm)	190
Width B (mm)	43
Inner-ring shoulder dia. D1 (mm)	165.1

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	67443
Basic static load rating Cor (lbs)	80931
Basic dynamic load rating Cr (N)	300000
Basic static load rating C0r (N)	360000
Fatigue limit load Cur (N)	30500
Limiting speed nG (rpm)	3,500

Weight

Weight (kg)	6.25

Mounting dimensions (fillets / shoulders)

Housing fillet r max (mm)	3
Shaft shoulder da (mm)	104
Housing shoulder Da (mm)	176
Housing fillet ra max (mm)	2.5

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,100 rpm
4	75,000	102	1,539
6	50,000	392	5,947
8	37,500	1,024	15,515
10	30,000	2,154	32,643
15	20,000	8,323	126,113

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 300,000 N. Hours = L₁₀ x 10⁶ / (60n). Life-modification factors for lubrication, contamination and temperature (a_ISO) are not included.

Source & traceability

Brand	FAG
Source catalogue	FAG / Schaeffler Rolling Bearings HR 1
Catalogue page	p.656 (dimensions)

Load ratings in newtons, fatigue limit load Cur, limiting speed nG and reference speed nB.

Interchange - same dimensions, other brands

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
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
HR30318J	NSK	Tapered Roller	90	190	43	77,600 lbs	5.915

Same dimensions, same brand

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

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
20318-K-MB-C3	FAG	Spherical Roller	90	190	43	300 kN	6.17

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
20218-K-MB-C3	FAG	Spherical Roller	90	160	30	174 kN	2.68
20218-MB	FAG	Spherical Roller	90	160	30	174 kN	2.72
21318-E1-XL	FAG	Spherical Roller	90	190	43	380 kN	6.26
21318-E1-XL-K	FAG	Spherical Roller	90	190	43	380 kN	6.26
22218-E1-XL	FAG	Spherical Roller	90	160	40	345 kN	3.42
22218-E1-XL-K	FAG	Spherical Roller	90	160	40	345 kN	3.35
22318-E1-XL	FAG	Spherical Roller	90	190	64	610 kN	8.69
22318-E1-XL-K	FAG	Spherical Roller	90	190	64	610 kN	8.5

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