The radial or axial interval measured in the bearing.

10. Contact Angle (Nominal Contact Angle)
The angle between the plane perpendicular to the bearing axis (radial plane) and the resultant line of action (nominal line of action) that is transmitted through the rolling elements to the raceway or ring.

11. Nominal Contact Point
The point where the rolling element makes contact with the raceway when the bearing components are in their normal relative position.

12. Reference End Face of a Ring (or Washer)
The end face of a ring or washer that is specified by the manufacturer as the reference surface for measurement purposes.

(3) Appearance Dimensions

1. Boundary Dimension
A dimension that defines the shape of the bearing. The basic dimensions include inner diameter, outer diameter, width (or height), and chamfer dimensions.

2. Bearing Inner Diameter
The inner diameter of the inner ring in a radial bearing or the inner diameter of the thrust ring in a thrust bearing.

3. Bearing Outer Diameter
The outer diameter of the outer ring in a radial bearing or the outer diameter of the thrust ring in a thrust bearing.

4. Bearing Width
The axial distance between the two end faces of the rings that determine the width of a radial bearing. In a single-row tapered roller bearing, it refers to the axial distance between the opposite sides of the inner and outer rings.

5. Bearing Height
The axial distance between the opposite sides of the two washers that define the height of a thrust bearing.

6. Chamfer Dimension of a Ring (or Washer)
The dimension of the chamfered edge on the ring or washer, which extends radially or axially.

7. Radial Chamfer Dimension
The dimension from the sharp corner to the gap between the end face of the ring or washer and the intersection of the chamfer.

8. Axial Chamfer Dimension
The dimension from the sharp corner to the inner bore of the ring or the space between the outer surface and the chamfered surface.

9. Flange Width
The distance between the ends of the flange.

10. Flange Height
The radial dimension of the flange. The height of the outer flange is the radial distance between the outer surface of the flange and the outer surface of the outer ring.

11. Stop Ring Groove Diameter
The diameter of the cylindrical outer surface of the stop ring groove.

12. Stop Ring Groove Width
The axial distance between the two ends of the groove.

13. Stop Ring Groove Depth
The radial distance between the cylindrical outer surface of the groove and the outer cylindrical surface of the bearing.

14. Alignment Surface Radius
The radius of curvature of the spherical outer surface of a self-aligning housing, self-aligning ring, or outer ring.

15. Spherical Surface Center Height
The axial distance between the curved surface of the spherical seat in a thrust bearing and the opposite side of the collar.

(4) Dimensions of Parts

1. Ball Diameter
The distance between two parallel planes tangent to the outer surface of the ball.

2. Roller Diameter
The distance between two tangent lines that are tangent to the outer surface of the roller in a plane perpendicular to the roller axis (radial plane). For calculating additional load, the middle radial plane of the roller is used.

3. Roller Length
The distance between two radial planes that include the ends of the roller. However, the "roller length" used in calculating additional loads refers to the theoretical maximum contact length between the roller and the raceway at the shortest contact point.

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