31308-XLFAGTapered Roller

Name: FAG 31308-XL Tapered Roller Bearing
Brand: FAG
SKU: 31308-XL

31308-XL is a FAG tapered roller bearing, bore 40 mm, O.D. 90 mm, width 23 mm, dynamic rating 89 kN. Dimensions, drawing, interchanges and price.

X-life

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Bore d40mm

Outside dia. D90mm

Width B23mm

Dynamic Cr89kN

Static C0r83kN

Limiting speed8,700rpm

Weight0.723kg

Cr / C0r1.07

Mean dia. dm65mm

Original catalogue drawing - FAG Schaeffler HR 1, page 590

31308-XL 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	40	1.5748
D	Outside diameter	90	3.5433
B	Inner-ring / bearing width	23	0.9055
T	Overall assembly width	25.25	0.9941
C	Cup / outer-ring width	17	0.6693

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)	40
Outside dia. D (mm)	90
Width B (mm)	23
Overall width T (mm)	25.25
Cup width C (mm)	17
Inner-ring OD d1 (mm)	67.7

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	20008
Basic static load rating Cor (lbs)	18659
Basic dynamic load rating Cr (N)	89000
Basic static load rating C0r (N)	83000
Basic dynamic axial rating Ca (N)	4
Fatigue limit load Cur (N)	12100
Factor e	0.83
Factor Y	0.73
Factor Y0	0.4
Limiting speed nG (rpm)	8,700
Reference speed nB (rpm)	5,100
Effective load centre a (mm)	30

Weight

Weight (kg)	0.723

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)	2
Shaft shoulder da (mm)	51
Shaft shoulder db (mm)	49
Housing shoulder Da (mm)	71
Housing shoulder Db (mm)	86
Housing fillet ra max (mm)	2
Fillet rb max (mm)	1.5

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 2,900 rpm
4	22,250	102	584
6	14,833	392	2,256
8	11,125	1,024	5,885
10	8,900	2,154	12,382
15	5,933	8,323	47,836

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 89,000 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.590 (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
1308	NSK	Ball	40	90	23	6,520 lbs	0.744
6308	NSK	Ball	40	90	23	9,160 lbs	0.635
7308B	NSK	Ball	40	90	23	9,480 lbs	0.658
BL308	NSK	Ball	40	90	23	12,300 lbs	0.667
308	NSK	Cylindrical Roller	40	90	23	13,200 lbs	0.653
NU308E	NSK	Cylindrical Roller	40	90	23	102 kN	0.747
21308EAE4	NSK	Spherical Roller	40	90	23	118 kN	0.73
HR30308	NSK	Tapered Roller	40	90	23	111 kN	0.758
HR30308C	NSK	Tapered Roller	40	90	23	19,000 lbs	0.717
HR30308J	NSK	Tapered Roller	40	90	23	20,300 lbs	0.757

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1308-K-TVH-C3	FAG	Ball	40	90	23	30 kN	0.698
1308-TVH	FAG	Ball	40	90	23	30 kN	0.708
6308	FAG	Ball	40	90	23	42.5 kN	0.64
6308-2RSR	FAG	Ball	40	90	23	42.5 kN	0.654
6308-2Z	FAG	Ball	40	90	23	42.5 kN	0.654
6308-C	FAG	Ball	40	90	23	47 kN	0.6
6308-C-2BRS	FAG	Ball	40	90	23	47 kN	0.654
6308-C-2HRS	FAG	Ball	40	90	23	47 kN	0.622

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
31308-A	FAG	Tapered Roller	40	90	23	76 kN	0.727
31308-A-N11CA-A50-90	FAG	Tapered Roller	40	90	None	130 kN	1.52
31308-XL-DF-A115-155	FAG	Tapered Roller	40	90	None	153 kN	1.52
31308-XL-DF-A50-90	FAG	Tapered Roller	40	90	None	153 kN	1.52

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
30208-A	FAG	Tapered Roller	40	80	18	61 kN	0.435
30208-XL	FAG	Tapered Roller	40	80	18	73 kN	0.432
30308-A	FAG	Tapered Roller	40	90	23	92 kN	0.812
32008-X-XL	FAG	Tapered Roller	40	68	19	63 kN	0.28
32008-XA	FAG	Tapered Roller	40	68	19	52 kN	0.312
32208-A	FAG	Tapered Roller	40	80	23	79 kN	0.551
32208-B-XL	FAG	Tapered Roller	40	80	23	87 kN	0.57
32208-XL	FAG	Tapered Roller	40	80	23	94 kN	0.6

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