31309-AFAGTapered Roller

Name: FAG 31309-A Tapered Roller Bearing
Brand: FAG
SKU: 31309-A

31309-A is a FAG tapered roller bearing, bore 45 mm, O.D. 100 mm, width 25 mm, dynamic rating 95 kN. Dimensions, drawing, interchanges and price.

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Bore d45mm

Outside dia. D100mm

Width B25mm

Dynamic Cr95kN

Static C0r107kN

Limiting speed6,700rpm

Weight0.998kg

Cr / C0r0.89

Mean dia. dm72.5mm

Original catalogue drawing - FAG Schaeffler HR 1, page 478

31309-A 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	45	1.7717
D	Outside diameter	100	3.937
B	Inner-ring / bearing width	25	0.9843
T	Overall assembly width	27.25	1.0728
C	Cup / outer-ring width	18	0.7087

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)	45
Outside dia. D (mm)	100
Width B (mm)	25
Overall width T (mm)	27.25
Cup width C (mm)	18
Inner-ring OD d1 (mm)	75.8

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	21357
Basic static load rating Cor (lbs)	24055
Basic dynamic load rating Cr (N)	95000
Basic static load rating C0r (N)	107000
Basic dynamic axial rating Ca (N)	4
Fatigue limit load Cur (N)	12600
Factor e	0.83
Factor Y	0.73
Factor Y0	0.4
Limiting speed nG (rpm)	6,700
Reference speed nB (rpm)	5,500
Effective load centre a (mm)	32

Weight

Weight (kg)	0.998

Mounting dimensions (fillets / shoulders)

Chamfer r2 min (mm)	2
Shaft shoulder da (mm)	56
Shaft shoulder db (mm)	54
Housing shoulder Da (mm)	91
Housing shoulder Db (mm)	95
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 2,200 rpm
4	23,750	102	770
6	15,833	392	2,973
8	11,875	1,024	7,758
10	9,500	2,154	16,321
15	6,333	8,323	63,057

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 95,000 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.478 (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
1309	NSK	Ball	45	100	25	8,540 lbs	0.993
6309	NSK	Ball	45	100	25	11,900 lbs	0.835
7309B	NSK	Ball	45	100	25	12,300 lbs	0.875
BL309	NSK	Ball	45	100	25	14,700 lbs	0.88
309	NSK	Cylindrical Roller	45	100	25	16,600 lbs	0.88
NU309E	NSK	Cylindrical Roller	45	100	25	120 kN	1.01
21309EAE4	NSK	Spherical Roller	45	100	25	149 kN	0.96
HR30309	NSK	Tapered Roller	45	100	25	138 kN	1.01
HR30309C	NSK	Tapered Roller	45	100	25	23,200 lbs	0.984
HR30309J	NSK	Tapered Roller	45	100	25	25,200 lbs	1.012

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1309-K-TVH-C3	FAG	Ball	45	100	25	38.5 kN	0.939
1309-TVH	FAG	Ball	45	100	25	38.5 kN	0.953
6309	FAG	Ball	45	100	25	53 kN	0.849
6309-2RSR	FAG	Ball	45	100	25	53 kN	0.867
6309-2Z	FAG	Ball	45	100	25	53 kN	0.869
6309-C	FAG	Ball	45	100	25	58 kN	0.83
6309-C-2BRS	FAG	Ball	45	100	25	58 kN	0.85
6309-C-2HRS	FAG	Ball	45	100	25	58 kN	0.85

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
31309-A-N11CA-A60-100	FAG	Tapered Roller	45	100	None	163 kN	2.1
31309-XL	FAG	Tapered Roller	45	100	25	114 kN	0.97

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
30209-A	FAG	Tapered Roller	45	85	19	70 kN	0.47
30209-XL	FAG	Tapered Roller	45	85	19	84 kN	0.488
30309-A	FAG	Tapered Roller	45	100	25	112 kN	1
32009-X-XL	FAG	Tapered Roller	45	75	20	72 kN	0.355
32009-XA	FAG	Tapered Roller	45	75	20	60 kN	0.329
32209-A	FAG	Tapered Roller	45	85	23	82 kN	0.57
32209-B-XL	FAG	Tapered Roller	45	85	23	93 kN	0.62
32209-XL	FAG	Tapered Roller	45	85	23	97 kN	0.592

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