23956-MBFAGSpherical Roller

Name: FAG 23956-MB Spherical Roller Bearing
Brand: FAG
SKU: 23956-MB

23956-MB is a FAG spherical roller bearing, bore 280 mm, O.D. 380 mm, width 75 mm, dynamic rating 970 kN. Dimensions, drawing, interchanges and price.

Brass cage

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Bore d280mm

Outside dia. D380mm

Width B75mm

Dynamic Cr970kN

Static C0r2040kN

Limiting speed2,000rpm

Weight25.5kg

Cr / C0r0.48

Mean dia. dm330mm

Original catalogue drawing - FAG Schaeffler HR 1, page 726

23956-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	280	11.0236
D	Outside diameter	380	14.9606
B	Inner-ring / bearing width	75	2.9528
r	Chamfer (min)	2.1	0.0827

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)	280
Outside dia. D (mm)	380
Width B (mm)	75
Inner-ring shoulder dia. D1 (mm)	350

Load ratings & speeds

Basic dynamic load rating Cr (lbs)	218065
Basic static load rating Cor (lbs)	458610
Basic dynamic load rating Cr (N)	970000
Basic static load rating C0r (N)	2.04e+06
Fatigue limit load Cur (N)	129000
Factor e	0.18
Factor Y0	3.67
Limiting speed nG (rpm)	2,000
Reference speed nB (rpm)	1,100

Weight

Weight (kg)	25.5

Mounting dimensions (fillets / shoulders)

Housing fillet r max (mm)	2.1
Shaft shoulder da (mm)	290.2
Housing shoulder Da (mm)	369.8
Housing fillet ra max (mm)	2.1

Bearing life (ISO 281 basic rating life)

C / P	Equivalent load P (N)	L₁₀ (10⁶ rev)	L_10h at 600 rpm
4	242,500	102	2,822
6	161,667	392	10,903
8	121,250	1,024	28,444
10	97,000	2,154	59,845
15	64,667	8,323	231,207

Basic rating life per ISO 281: L₁₀ = (C/P)^10/3 with C = 970,000 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.726 (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
23956CAME4	NSK	Spherical Roller	280	380	75	208,000 lbs	24.199
NN3956	NSK	Precision / Angular Contact	280	380	75	155,000 lbs	22.652

Same dimensions, same brand

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
23956-K-MB	FAG	Spherical Roller	280	380	75	970 kN	24.7

Series variants (different suffix)

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
23956-K-MB	FAG	Spherical Roller	280	380	75	970 kN	24.7

Nearby bore sizes

Designation	Brand	Type	d	D	B/T	Dyn. rating	kg
22256-BEA-XL-K-MB1	FAG	Spherical Roller	280	500	130	2750 kN	109
22256-BEA-XL-MB1	FAG	Spherical Roller	280	500	130	2750 kN	112
22356-BEA-XL-K-MB1	FAG	Spherical Roller	280	580	175	4150 kN	223
22356-BEA-XL-MB1	FAG	Spherical Roller	280	580	175	4150 kN	228
23056-BE-XL	FAG	Spherical Roller	280	420	106	1780 kN	50.9
23056-BE-XL-K	FAG	Spherical Roller	280	420	106	1780 kN	49.3
23156-BE-XL	FAG	Spherical Roller	280	460	146	2750 kN	96.3
23156-BE-XL-2RSR	FAG	Spherical Roller	280	460	146	2750 kN	96.3

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