21308-E1-XL-KFAGSpherical Roller

Name: FAG 21308-E1-XL-K Spherical Roller Bearing
Brand: FAG
SKU: 21308-E1-XL-K

21308-E1-XL-K is a FAG spherical roller bearing, bore 40 mm, O.D. 90 mm, width 23 mm. Dimensions, drawing, interchanges and price.

Tapered boreX-life

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Bore d40mm

Outside dia. D90mm

Width B23mm

Dynamic Cr109kN

Static C0r107kN

Limiting speed9,800rpm

Weight0.749kg

Cr / C0r1.02

Mean dia. dm65mm

Original catalogue drawing - FAG Schaeffler HR 1, page 756

21308-E1-XL-K 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	40	1.5748
D	Outside diameter	90	3.5433
B	Inner-ring / bearing width	23	0.9055
r	Chamfer (min)	1.5	0.0591

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
Inner-ring shoulder dia. D1 (mm)	80.8

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	24504
Basic static load rating Cor (lbs)	24055
Basic dynamic load rating Cr (N)	109000
Basic static load rating C0r (N)	107000
Fatigue limit load Cur (N)	14300
Factor e	0.23
Factor Y0	2.89
Limiting speed nG (rpm)	9,800
Reference speed nB (rpm)	5,200

Weight

Weight (kg)	0.749

Mounting dimensions (fillets / shoulders)

Housing fillet r max (mm)	1.5
Shaft shoulder da (mm)	49
Shaft shoulder db (mm)	44
Housing shoulder Da (mm)	81
Housing fillet ra max (mm)	1.5

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 3,000 rpm
4	27,250	102	564
6	18,167	392	2,181
8	13,625	1,024	5,689
10	10,900	2,154	11,969
15	7,267	8,323	46,241

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 109,000 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.756 (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
21308-E1-XL	FAG	Spherical Roller	40	90	23	109 kN	0.749

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
20208-K-TVP-C3	FAG	Spherical Roller	40	80	18	49.5 kN	0.38
20208-TVP	FAG	Spherical Roller	40	80	18	49.5 kN	0.386
20308-TVP	FAG	Spherical Roller	40	90	23	76 kN	0.671
22208-E1-XL	FAG	Spherical Roller	40	80	23	101 kN	0.528
22208-E1-XL-K	FAG	Spherical Roller	40	80	23	101 kN	0.528
22308-E1-XL	FAG	Spherical Roller	40	90	33	156 kN	1.05
22308-E1-XL-K	FAG	Spherical Roller	40	90	33	156 kN	1
22308-E1-XL-K-T41A	FAG	Spherical Roller	40	90	33	156 kN	1

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