A ball bearing cage includes a plurality of ball pockets, wherein each ball pocket serves for receiving a ball, wherein each ball pocket (12, 22) has a width (B) in axial direction of the ball bearing cage (10, 20) and a length in circumferential direction of the ball bearing cage (10, 20), with the width (B) being slightly greater than a diameter of the ball (30), wherein the length is greater than the width (B) of the ball pocket (12,22) at least at an outer circumference (U.sub.A) of the ball bearing cage (10), and the length (L.sub.A) of the ball pocket (12,22) at the outer circumference (U.sub.A) of the ball bearing cage (10) is greater than the length (L.sub.I) of the ball pocket (12,22) at the inner circumference (U.sub.I) of the ball bearing cage (10,20).

Provided is a linear motion guide device that is less noisy and excellent in operability. A concave groove of a return guide and a raceway groove of a slider are not smoothly continued at a connection portion therebetween, where a stepped portion is formed. At a groove bottom portion of the raceway groove of the slider and the neighboring portion thereof, the surface of the raceway groove of the slider is located to be closer to a curvature center of the raceway groove of the slider than the surface of the concave groove of the return guide is. At a groove shoulder portion of the raceway groove of the slider and the neighboring portion thereof, the surface of the concave groove of the return guide is located to be closer to the curvature center of the raceway groove of the slider than the surface of the raceway groove of the slider is.

A connecting rod having a small end and a large end, the small end including a pin bore defined by a pin bore surface. A thermal spray coating applied to at least a portion of the pin bore surface and a method of applying the thermal spray coating to the pin bore surface using a thermal spray technique.

A milling tool includes a main body and a plurality of cutting inserts with respective cutting edges. The main body has an end face and a barrel-shaped curved lateral face. A first group of the plurality of cutting inserts are fastened on the end face, a second group of the plurality of cutting inserts are fastened on the barrel-shaped curved lateral face, and the respective cutting edges describe a barrel shape. Each one of the plurality of cutting inserts may be designed as an indexable insert.