Running Clearance

IntroductionSelection Guide Engineering DataBrochure

As a general rule, close running fits, and often slight interference fits (.0005 in.) are selected for oscillating motion when minimum starting torque is less important than the elimination of free play. For constant rotation, a free-running fit is normally recommended, the exact amount depending on bearing bore size. A rule of thumb would be 0.0015 inches per inch of bore ( bearing installed).