Product specifications

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

Core specifications11 parameters

Core specifications
Parameter	Symbol	Value
Series		KM12649
Bore diameter	d	21.43 mm
Basic dynamic load rating	C	35.6 kN
Basic static load rating	C0	39 kN
Fatigue load limit	Pu	4.5 kN
Limiting speed	nG	12640 r/min
Mass	≈m	0.13 kg
Precision class		ABMA4 — Class 4 (ANSI/ABMA 19.2:2013)
Cage		Standard — Sheet steel cage, window cage, roller-guided
Minimum operating temperature	Tmin	-30 °C
Maximum operating temperature	Tmax	120 °C

Product characteristics5 parameters

Product characteristics
Parameter	Symbol	Value
Tolerance class	ABMA4	Class 4 (ANSI/ABMA 19.2:2013)
Heat treatment		Standard
Cage	Standard	Sheet steel cage, window cage, roller-guided
Quality level		H
Number of rows	1	Single-row design

Main Dimensions & Performance Data7 parameters

Main Dimensions & Performance Data
Parameter	Symbol	Value
Bore diameter	d	21.43 mm0.844 in
Width, inner ring	B	18.288 mm0.72 in
Basic dynamic load rating, radial	Cr	35,600 N8,003.597 lbf
Basic static load rating, radial	C0r	39,000 N8,767.986 lbf
Fatigue load limit, radial	Cur	4,500 N1,011.691 lbf
Limiting speed	nG	12,640 1/min
Mass	≈m	0.13 kg0.287 lbs

Mounting dimensions5 parameters

Mounting dimensions
Parameter	Symbol	Value
Maximum diameter of shaft shoulder	da max	27.5 mm1.083 in
Minimum diameter of shaft shoulder	db min	29.5 mm1.161 in
Minimum axial space	CRa min	1.2 mm0.047 in
Maximum axial space	CRb max	0.3 mm0.012 in
Maximum fillet radius of shaft	ra max	1.3 mm0.051 in

Dimensions5 parameters

Dimensions
Parameter	Symbol	Value
Minimum chamfer dimension of inner ring back face	r1, 2 min	1.3 mm0.051 in
Distance between the apexes of the pressure cones	a	12 mm0.472 in
Guidance rib diameter of inner ring	d1	35.5 mm1.398 in
Outer envelope circle	Ew	46.368 mm1.826 in
Contact angle	α	10.5 °

Temperature range2 parameters

Temperature range
Parameter	Symbol	Value
Operating temperature min.	Tmin	-30 °C-22 °F
Operating temperature max.	Tmax	120 °C248 °F

Calculation factors3 parameters

Calculation factors
Parameter	Symbol	Value
Limiting value of Fa/Fr for the applicability of diff. Values of factors X and Y	e	0.28
Dynamic axial load factor	Y	2.16
Static axial load factor	Y0	1.19

Capabilities & suitability5 parameters

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

Manufacturer Identity5 parameters

Product Identity2 parameters

Product Identity
Parameter	Symbol	Value
Construction		Tapered roller bearings without outer ring (Cone) K-Series, in inch sizes
Short Description		Tapered roller bearing

Technical Data20 parameters

Technical Data
Parameter	Symbol	Value
Bore Diameter (D)		21.43 mm
Basic Dynamic Load Rating, Radial (Cr)		35,600 N
Basic Static Load Rating, Radial (C0R)		39,000 N
Operating Temperature Min. (Tmin)		-30 °C
Limiting Speed (Ng)		12,640 1/min
Operating Temperature Max. (Tmax)		120 °C
Contact Angle (Α)		10.5 °
Fatigue Load Limit, Radial (Cur)		4,500 N
Limiting Value Of Fa/Fr For The Applicability Of Diff. Values Of Factors X And Y (E)		0.28
Maximum Diameter Of Shaft Shoulder (Da Max)		27.5 mm
Minimum Diameter Of Shaft Shoulder (Db Min)		29.5 mm
Dynamic Axial Load Factor (Y)		2.16
Maximum Fillet Radius (Ra Max)		1.3 mm
Maximum Axial Space (Crb Max)		0.3 mm
Minimum Chamfer Dimension Of Inner Ring Back Face (R1, 2 M)		1.3 mm
Guidance Rib Diameter Of Inner Ring (D1)		35.5 mm
Minimum Axial Space (Cra Min)		1.2 mm
Width, Inner Ring (B)		18.288 mm
Static Axial Load Factor (Y0)		1.19
Distance Between The Apexes Of The Pressure Cones (A)		12 mm

FAG KM12649-H