30248 Series

Metric Series Tapered Roller Bearings

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Grouped product items
Parts Number
30248 Metric Series Tapered Roller Bearings			Add to Compare You can use this service by registering as a member.
30248P5 Metric Series Tapered Roller Bearings			Add to Compare You can use this service by registering as a member.
30248P6 Metric Series Tapered Roller Bearings			Add to Compare You can use this service by registering as a member.

Product Information

Display units Metric Imperial

Designations

30248

Boundary Dimensions

d	240	mm	Bore diameter
D	440	mm	Outside diameter
T	79	mm	Total width
B	72	mm	Width of inner ring
C	60	mm	Width of outer ring
Cup r (min.)	4	mm	Chamfer dimension of outer ring (Cup)
Cone r (min.)	5	mm	Chamfer dimension of inner ring (Cone)

Basic Load Ratings

C_r	1220000	N	Basic dynamic load rating
C_0r	1400000	N	Basic static load rating

Speeds

Grease	750	min^-1	Grease lubrication
Oil (Oil-bath)	1000	min^-1	Oil-bath lubrication

Dimensions

85.1

Effective load center

Abutment and Fillet Dimensions

da (min.)	267	mm	Diameter of shaft abutment
Db (min.)	408	mm	Diameter of housing abutment
Da (min.)	384	mm	Diameter of housing abutment
Da (max.)	422	mm	Diameter of housing abutment
Sa	11	mm	Minimum width of space required in housing on large side face
Sb	19	mm	Minimum width of space required in housing on small side face
db (max.)	288	mm	Diameter of shaft abutment
ra (max.)	4	mm	Radius of shaft or housing fillet of inner ring
ra (max.)	3	mm	Radius of shaft or housing fillet of outer ring

Calculation factors

e	0.44	Constant
Y0	0.74	Axial load Factors
Y1	1.4	Axial load Factors

Mass

(approx.)

45.2

Drawing for Reference

Designations	Boundary Dimensions					Basic Load Ratings		Tolerance Class	Limiting Speeds		Mass
Designations	d (mm)	D (mm)	T (mm)	B (mm)	C (mm)	C_r (N)	C_0r (N)	Tolerance Class	Grease (min^-1)	Oil (Oil-bath) (min^-1)	(approx.) (kg)
30248	240	440	79	72	60	1220000	1400000		750	1000	45.2

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Not to scale.
(*) The chamfer dimensions are minimum values.
Suffix C represents medium-angle tapered roller bearings. Since they are designed for specific applications, please consult NSK when using bearings with suffix C.
The bore diameter "no-go side" tolerances (High) specified in this drawing do not necessarily apply within a distance from the ring face to 1.2 times the chamfer dimension r (max).
Some of these tolerances conform to NSK standards.

CAD

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NSK Product Type2	TRBSR_MD
NSK Product Type	Bearing
Designations	30248