NTN 7304 Angular Contact Bearing - D=20

SKU: NTN 7304


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NTN 7304

Single Angular Contact Ball Bearing - Open Type


Bore Diameter 20 mm, 0.7874 in
Outside Diameter 52 mm, 2.0472 in
Overall Width 15 mm, 0.5906 in
Contact Angle 30 °
Closure Type Open
Cage Type Pressed
Bore Type Round
Bearing Material High Carbon Chrome Steel
Cage Material Steel
Outer Ring Width 0.5906 in; 15.000 mm
Inner Ring Width 15.000 mm, 0.5906 in
Configuration One
Maximum RPM (Grease) 16000 rpm
Maximum RPM 21000 rpm
Fillet Radius 1.100 mm, 0.0433 in
Dynamic Load Capacity 4200 lbf
Static Load Capacity 2340 lbf
Manufacturer UPC Number 4547359448405

Angular Contact Ball Bearings

1. Design features and characteristics

1.1  Angular contact ball bearing

Angular contact ball bearings are non-separable bearings with a defined contact angle in the radial direction relative to the straight line that runs through the point where each ball makes contact with the inner and outer rings (see Fig. 1). Table 1 provides information on contact angles and their designated codes.

In addition to radial loads, angular contact ball bearings can accommodate single direction axial loads. Since an axial load is generated from a radial force, these bearings are generally used in pairs. Table 2 shows general angular contact ball bearing characteristics, Table 3 shows information on using duplex (side by side) angular contact ball bearings, and Table 4 shows information on multiple-row angular contact ball bearings.

For bearings with a contact angle of 15° and bearing tolerance JIS Class 5 or higher, see special catalog “Precision rolling bearings (CAT. No. 2260/E)”.



1.2  Four-point angular contact ball bearings

Four-point angular contact ball bearings have a contact angle of 30° and a split inner ring. As shown in Fig. 2, when the inner and outer rings receive a radial load, the ball contacts the inner and outer rings at four points. This construction enables a single bearing to accommodate axial loads from either direction, and when under a simple axial load or heavy axial load, the bearing relies on two contact points like ordinary bearings.


1.3  Double row angular contact ball bearings

The structure of double row angular contact ball bearings is designed by arranging two single row angular contact bearings back-to-back in duplex (DB) to form a single bearing with a contact angle of 25°.
These bearings are capable of accommodating radial loads, axial loads in either direction, and have a high capacity for moment loads.
As shown in Fig. 4, sealed and shielded type double row angular contact ball bearings are also available. Standard loads vary from those of open type bearings.



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