Recommended Use. In general, the 3% interference in all thread sizes is recommended for harder, less malleable materials such as cast iron. 5% interference is recommended for 3/8" (M10) diameter and up for softer materials such as aluminum. The 8% interference is recommended for sizes #10 (M4) through 5 16 " (M8), for use in aluminum. All interferences are based on the use of tap drill sizes which achieve 75% of internal thread. Sizes smaller than #10 are available. Example: When you specify a 3/8-16 In-Thread 3 locking thread, the major diameter will be .3750/.3660" and the pitch diameter will not exceed .3344". The minor (root) diameter will be .3151/.3175 (see chart on coarse threads). American Standard Sizes

ISO 9001:2008 CERTIFIED