31318FAGTapered Roller

Name: FAG 31318 Tapered Roller Bearing
Brand: FAG
SKU: 31318

31318 is a FAG tapered roller bearing, bore 90 mm, O.D. 190 mm, width 43 mm, dynamic rating 275 kN. Dimensions, drawing, interchanges and price.

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Bore d90mm

Outside dia. D190mm

Width B43mm

Dynamic Cr275kN

Static C0r330kN

Limiting speed4,000rpm

Weight5.5kg

Cr / C0r0.83

Mean dia. dm140mm

Original catalogue drawing - FAG Schaeffler HR 1, page 484

31318 FAG Tapered 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
T	Overall assembly width	46.5	1.8307
C	Cup / outer-ring width	30	1.1811

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
Overall width T (mm)	46.5
Cup width C (mm)	30
Inner-ring OD d1 (mm)	135.9

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	61822
Basic static load rating Cor (lbs)	74187
Basic dynamic load rating Cr (N)	275000
Basic static load rating C0r (N)	330000
Basic dynamic axial rating Ca (N)	6
Fatigue limit load Cur (N)	35500
Factor e	0.83
Factor Y	0.73
Factor Y0	0.4
Limiting speed nG (rpm)	4,000
Reference speed nB (rpm)	3,350
Effective load centre a (mm)	58

Weight

Weight (kg)	5.5

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)	4
Shaft shoulder da (mm)	109
Shaft shoulder db (mm)	104
Housing shoulder Da (mm)	176
Housing shoulder Db (mm)	179
Housing fillet ra max (mm)	4
Fillet rb max (mm)	3

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 1,300 rpm
4	68,750	102	1,302
6	45,833	392	5,032
8	34,375	1,024	13,128
10	27,500	2,154	27,621
15	18,333	8,323	106,711

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 275,000 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.484 (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
31318-N11CA-A120-160	FAG	Tapered Roller	90	190	None	475 kN	11.8
31318-N11CA-A160-200	FAG	Tapered Roller	90	190	None	475 kN	11.8

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
30218-A	FAG	Tapered Roller	90	160	30	199 kN	2.64
30218-XL	FAG	Tapered Roller	90	160	30	239 kN	2.61
30318-A	FAG	Tapered Roller	90	190	43	335 kN	5.83
32018-X-XL	FAG	Tapered Roller	90	140	32	195 kN	1.76
32018-X-XL-DF-A170-220	FAG	Tapered Roller	90	140	None	335 kN	3.64
32018-XA	FAG	Tapered Roller	90	140	32	163 kN	1.76
32218-A	FAG	Tapered Roller	90	160	40	260 kN	3.78
32218-XL	FAG	Tapered Roller	90	160	40	310 kN	3.43

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