20317-MBFAGSpherical Roller

Name: FAG 20317-MB Spherical Roller Bearing
Brand: FAG
SKU: 20317-MB

20317-MB is a FAG spherical roller bearing, bore 85 mm, O.D. 180 mm, width 41 mm, dynamic rating 270 kN. Dimensions, drawing, interchanges and price.

Brass cage

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Bore d85mm

Outside dia. D180mm

Width B41mm

Dynamic Cr270kN

Static C0r320kN

Limiting speed3,750rpm

Weight5.25kg

Cr / C0r0.84

Mean dia. dm132.5mm

Original catalogue drawing - FAG Schaeffler HR 1, page 656

20317-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	85	3.3465
D	Outside diameter	180	7.0866
B	Inner-ring / bearing width	41	1.6142
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)	85
Outside dia. D (mm)	180
Width B (mm)	41
Inner-ring shoulder dia. D1 (mm)	156.9

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	60698
Basic static load rating Cor (lbs)	71939
Basic dynamic load rating Cr (N)	270000
Basic static load rating C0r (N)	320000
Fatigue limit load Cur (N)	28500
Limiting speed nG (rpm)	3,750

Weight

Weight (kg)	5.25

Mounting dimensions (fillets / shoulders)

Housing fillet r max (mm)	3
Shaft shoulder da (mm)	99
Housing shoulder Da (mm)	166
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 1,200 rpm
4	67,500	102	1,411
6	45,000	392	5,451
8	33,750	1,024	14,222
10	27,000	2,154	29,923
15	18,000	8,323	115,604

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 270,000 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
1317	NSK	Ball	85	180	41	108 kN	5.03
6317	NSK	Ball	85	180	41	29,800 lbs	4.25
7317B	NSK	Ball	85	180	41	30,900 lbs	5.035
BL317	NSK	Ball	85	180	41	39,100 lbs	4.699
317	NSK	Cylindrical Roller	85	180	41	47,500 lbs	4.536
NU317	NSK	Cylindrical Roller	85	180	41	261 kN	4.6
NU317E	NSK	Cylindrical Roller	85	180	41	360 kN	5.26
21317EAE4	NSK	Spherical Roller	85	180	41	360 kN	5.2
HR30317	NSK	Tapered Roller	85	180	41	380 kN	5.08
HR30317J	NSK	Tapered Roller	85	180	41	69,700 lbs	5.08

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
1317-K-M-C3	FAG	Ball	85	180	41	99 kN	5.32
1317-M	FAG	Ball	85	180	41	99 kN	5.39
6317	FAG	Ball	85	180	41	141 kN	4.25
6317-2RSR	FAG	Ball	85	180	41	141 kN	4.25
6317-2Z	FAG	Ball	85	180	41	141 kN	4.33
QJ317-N2-MPA	FAG	Ball	85	180	41	245 kN	5.54
N317-E-M1	FAG	Cylindrical Roller	85	180	41	340 kN	5.3
N317-E-XL-M1	FAG	Cylindrical Roller	85	180	41	340 kN	5.3

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
20217-K-MB-C3	FAG	Spherical Roller	85	150	28	155 kN	2.19
20217-MB	FAG	Spherical Roller	85	150	28	155 kN	2.22
21317-E1-XL	FAG	Spherical Roller	85	180	41	345 kN	5.36
21317-E1-XL-K	FAG	Spherical Roller	85	180	41	345 kN	5.3
22217-E1-XL	FAG	Spherical Roller	85	150	36	305 kN	2.65
22217-E1-XL-K	FAG	Spherical Roller	85	150	36	305 kN	2.59
22317-E1-XL	FAG	Spherical Roller	85	180	60	540 kN	7.06
22317-E1-XL-K	FAG	Spherical Roller	85	180	60	540 kN	7.1

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