Product specifications

Metric and imperial values are paired where the manufacturer provides both. Expand a section to review its parameters.

Core specifications17 parameters

Core specifications
Parameter	Symbol	Value
Series		1220
Bore diameter	d	100 mm
Outside diameter	D	180 mm
Width	B	34 mm
Basic dynamic load rating	C	70 kN
Basic static load rating	C0	29.5 kN
Fatigue load limit	Pu	1.59 kN
Reference speed	nref	4500 r/min
Limiting speed	nG	6000 r/min
Mass	≈m	3.606 kg
Precision class		PN — Normal (ISO 492:2023)
Internal clearance		CN (Group N) — Normal internal clearance
Sealing		Without — Not sealed
Cage		M — Solid brass cage, ball guided
Lubricant		Without — Bearing not greased
Minimum operating temperature	Tmin	-30 °C
Maximum operating temperature	Tmax	150 °C

Precision classification2 parameters

Precision classification
Parameter	Symbol	Value
Radial ball bearing tolerance equivalent		ABEC 1Derived from ISO Normal; not a direct ABEC marking
Mapping basis		ISO 492 / ANSI/ABMA 20The original manufacturer tolerance remains the controlling value.

Product characteristics6 parameters

Main Dimensions & Performance Data9 parameters

Main Dimensions & Performance Data
Parameter	Symbol	Value
Bore diameter	d	100 mm3.937 in
Outside diameter	D	180 mm7.087 in
Width	B	34 mm1.339 in
Basic dynamic load rating, radial	Cr	70,000 N15,737.41 lbf
Basic static load rating, radial	C0r	29,500 N6,632.194 lbf
Fatigue load limit, radial	Cur	1,590 N357.464 lbf
Limiting speed	nG	6,000 1/min
Reference speed	nϑr	4,500 1/min
Mass	≈m	3.606 kg7.95 lbs

Mounting dimensions3 parameters

Mounting dimensions
Parameter	Symbol	Value
Minimum diameter shaft shoulder	da min	112 mm4.409 in
Maximum diameter of housing shoulder	Da max	168 mm6.614 in
Maximum fillet radius	ra max	2.1 mm0.083 in

Dimensions3 parameters

Dimensions
Parameter	Symbol	Value
Minimum chamfer dimension	rmin	2.1 mm0.083 in
Shoulder diameter outer ring	D1	155.2 mm6.11 in
Shoulder diameter inner ring	d1	127.3 mm5.012 in

Temperature range2 parameters

Temperature range
Parameter	Symbol	Value
Operating temperature min.	Tmin	-30 °C-22 °F
Operating temperature max.	Tmax	150 °C302 °F

Calculation factors4 parameters

Calculation factors
Parameter	Symbol	Value
Limiting value of Fa/Fr for the applicability of diff. Values of factors X and Y	e	0.18
Dynamic axial load factor	Y1	3.58
Dynamic axial load factor	Y2	5.53
Static axial load factor	Y0	3.75

Capabilities & suitability8 parameters

Capabilities & suitability
Parameter	Symbol	Value
Radial load capacity		Yes
Axial load capacity in one direction		Yes
Axial load capacity in both directions		Yes
Suitable for grease lubrication		Yes
Suitable for oil lubrication		Yes
Unsealed design		Yes
Staticangularerrorandmisalignment		Yes
Dynamicangularerrorandmisalignment		Yes

Manufacturer Identity9 parameters

Product Identity2 parameters

Product Identity
Parameter	Symbol	Value
Construction		Self-aligning ball bearing 12..-M, solid brass cage
Short Description		Self-aligning ball bearing

Technical Data20 parameters

Technical Data
Parameter	Symbol	Value
Bore Diameter (D)		100 mm
Outside Diameter (D)		180 mm
Width (B)		34 mm
Basic Dynamic Load Rating, Radial (Cr)		70,000 N
Basic Static Load Rating, Radial (C0R)		29,500 N
Operating Temperature Min. (Tmin)		-30 °C
Limiting Speed (Ng)		6,000 1/min
Operating Temperature Max. (Tmax)		150 °C
Reference Speed (Nϑr)		4,500 1/min
Fatigue Load Limit, Radial (Cur)		1,590 N
Limiting Value Of Fa/Fr For The Applicability Of Diff. Values Of Factors X And Y (E)		0.18
Minimum Diameter Shaft Shoulder (Da Min)		112 mm
Shoulder Diameter Inner Ring (D1)		127.3 mm
Dynamic Axial Load Factor (Y1)		3.58
Maximum Diameter Of Housing Shoulder (Da Max)		168 mm
Minimum Chamfer Dimension (Rmin)		2.1 mm
Maximum Fillet Radius (Ra Max)		2.1 mm
Shoulder Diameter Outer Ring (D1)		155.2 mm
Dynamic Axial Load Factor (Y2)		5.53
Static Axial Load Factor (Y0)		3.75

FAG 1220-M