Official Answer
Answer
In soft materials like plastic or magnesium, the minimum groove depth must be deeper than standard steel specifications to increase the shear area. The depth $d$ is determined by $d ≥ _x000c_rac{P imes KFS}{ ext{π} imes D imes S_s}$, where $S_s$ is the low shear strength of the housing. Additionally, the 'Edge Margin' (the distance from the groove to the end of the shaft/bore) must be at least $3$ times the groove depth to prevent 'blow-out' failure, where the housing material fails in a shear-cone pattern. Engineers often use multi-turn rings in these cases to spread the load across a wider surface.
