29248 Series

Thrust Spherical Roller Bearings

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Grouped product items
Parts Number
29248M Thrust Spherical Roller Bearings			Add to Compare You can use this service by registering as a member.

Product Information

Display units Metric Imperial

Designations

29248

Boundary Dimensions

d	240	mm	Bore diameter
D	340	mm	Outside diameter
T,T3	60	mm	Height
r (min.)	2.1	mm	Chamfer dimension

Basic Load Ratings

C_a	800000	N	Basic dynamic load rating
C_0a	3450000	N	Basic static load rating

Speeds

Oil (Oil-bath)

1200

min^-1

Oil-bath lubrication

Dimensions

B2	57	mm	Height shaft washer + cage
d1	325	mm	Outside diameter of shaft washer end side face
B1	19	mm	Width shaft washer or length of shaft washer bore diameter that fits on shaft
C	30	mm	Height housing washer
A	130	mm	Distance from shaft washer end side face to pressure point
D1	283	mm	Shoulder diameter outer ring

Abutment and Fillet Dimensions

Da (max.)	305	mm	Diameter of housing abutment
ra (max.)	2	mm	Radius of shaft or housing fillet
da (min.)	285	mm	Abutment diameter spacer ring (E design)

Mass

(approx.)

16.5

Drawing for Reference

Designations	Boundary Dimensions			Basic Load Ratings		Tolerance Class	Limiting Speeds	Mass
Designations	d (mm)	D (mm)	T,T3 (mm)	C_a (N)	C_0a (N)	Tolerance Class	Oil (Oil-bath) (min^-1)	(approx.) (kg)
29248	240	340	60	800000	3450000		1200	16.5

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Not to scale.
(*) The chamfer dimensions are minimum values.
For heavy load applications, ensure that the da value chosen is large enough to support the shaft washer rib.

CAD

FAQs (3)

Customer Questions

Can cylindrical roller thrust bearings be used without positioning by the outside diameter of the outer ring?

The fixed-side ring (outer ring) does not require especially precise positioning; however, a guide should be used to prevent the raceway from shifting and protruding from the rolling surface of the rollers.

If a cylindrical roller thrust bearing is used with a horizontal shaft, what kind of fit will be used with the housing side? Is it necessary to provide the same “0.25 mm or above” clearance as thrust ball bearings?

This clearance is recommended for thrust ball bearings as they may be subject to radial loads. Cylindrical roller thrust bearings cannot handle radial loads by design, so such a large clearance is not necessary.

Can thrust roller bearings sustain radial loads?

With the exception of cylindrical roller thrust bearings and some tapered roller thrust bearings (TTF type), it is possible in theory for thrust roller bearings to take radial loads to a certain percentage of the axial load. However, stable operation under these conditions requires careful restrictions.

For this reason, we primarily recommend thrust roller bearings for axial load applications.

More Information

More Information
NSK Product Type2	TB_TSRB
NSK Product Type	Bearing
Designations	29248