Product specifications

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

Core specifications12 parameters

Core specifications
Parameter	Symbol	Value
Series		K641
Bore diameter	d	66.675 mm
Basic dynamic load rating	C	260 kN
Basic static load rating	C0	275 kN
Fatigue load limit	Pu	45.5 kN
Reference speed	nref	4150 r/min
Limiting speed	nG	6500 r/min
Mass	≈m	2.44 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	200 °C

Product characteristics5 parameters

Product characteristics
Parameter	Symbol	Value
Tolerance class	ABMA4	Class 4 (ANSI/ABMA 19.2:2013)
Heat treatment	W215FB	Bainitic hardened
Cage	Standard	Sheet steel cage, window cage, roller-guided
Quality level	XL	X-life
Number of rows	1	Single-row design

Main Dimensions & Performance Data8 parameters

Main Dimensions & Performance Data
Parameter	Symbol	Value
Bore diameter	d	66.675 mm2.625 in
Width, inner ring	B	41.275 mm1.625 in
Basic dynamic load rating, radial	Cr	260,000 N58,453.237 lbf
Basic static load rating, radial	C0r	275,000 N61,825.54 lbf
Fatigue load limit, radial	Cur	45,500 N10,229.317 lbf
Limiting speed	nG	6,500 1/min
Thermal speed rating	nϑr	4,150 1/min
Mass	≈m	2.44 kg5.379 lbs

Mounting dimensions5 parameters

Mounting dimensions
Parameter	Symbol	Value
Maximum diameter of shaft shoulder	da max	77 mm3.031 in
Minimum diameter of shaft shoulder	db min	83 mm3.268 in
Minimum axial space	CRa min	5 mm0.197 in
Maximum axial space	CRb max	1 mm0.039 in
Maximum fillet radius of shaft	ra max	3.6 mm0.142 in

Dimensions5 parameters

Dimensions
Parameter	Symbol	Value
Minimum chamfer dimension of inner ring back face	r1, 2 min	3.6 mm0.142 in
Distance between the apexes of the pressure cones	a	30 mm1.181 in
Guidance rib diameter of inner ring	d1	99.6 mm3.921 in
Outer envelope circle	Ew	127.334 mm5.013 in
Contact angle	α	13.567 °

Temperature range2 parameters

Temperature range
Parameter	Symbol	Value
Operating temperature min.	Tmin	-30 °C-22 °F
Operating temperature max.	Tmax	200 °C392 °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	0.36
Dynamic axial load factor	Y	1.66
Static axial load factor	Y0	0.91

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 Identity6 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 Data21 parameters

Technical Data
Parameter	Symbol	Value
Bore Diameter (D)		66.675 mm
Basic Dynamic Load Rating, Radial (Cr)		260,000 N
Basic Static Load Rating, Radial (C0R)		275,000 N
Operating Temperature Min. (Tmin)		-30 °C
Limiting Speed (Ng)		6,500 1/min
Operating Temperature Max. (Tmax)		200 °C
Reference Speed (Nϑr)		4,150 1/min
Contact Angle (Α)		13.567 °
Fatigue Load Limit, Radial (Cur)		45,500 N
Limiting Value Of Fa/Fr For The Applicability Of Diff. Values Of Factors X And Y (E)		0.36
Maximum Diameter Of Shaft Shoulder (Da Max)		77 mm
Minimum Diameter Of Shaft Shoulder (Db Min)		83 mm
Dynamic Axial Load Factor (Y)		1.66
Maximum Fillet Radius (Ra Max)		3.6 mm
Maximum Axial Space (Crb Max)		1 mm
Minimum Chamfer Dimension Of Inner Ring Back Face (R1, 2 M)		3.6 mm
Guidance Rib Diameter Of Inner Ring (D1)		99.6 mm
Minimum Axial Space (Cra Min)		5 mm
Width, Inner Ring (B)		41.275 mm
Static Axial Load Factor (Y0)		0.91
Distance Between The Apexes Of The Pressure Cones (A)		30 mm

FAG K641-XL-W215FB