Knowledge Answer

How do you calculate the shear strength of the groove wall for a spiral retaining ring?

2026-06-16 FAQ

The thrust capacity based on groove shear is calculated as $P_g = _x000c_rac{D imes d imes ext{π} imes S_s}{KFS}$ where $D$ is the shaft/bore diameter, $d$ is the groove depth, $S_s$ is the shear strength of the housing material, and $KFS$ is the safety factor (usually 2 or 3). It is crucial to recognize that the housing material (e.g., Aluminum 6061-T6)...

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The thrust capacity based on groove shear is calculated as $P_g = _x000c_rac{D imes d imes ext{π} imes S_s}{KFS}$ where $D$ is the shaft/bore diameter, $d$ is the groove depth, $S_s$ is the shear strength of the housing material, and $KFS$ is the safety factor (usually 2 or 3). It is crucial to recognize that the housing material (e.g., Aluminum 6061-T6) is often the limiting factor rather than the ring itself (SAE 1070). If the groove wall shears, the ring will tilt and eventually 'dish', leading to assembly failure. Designers must ensure the groove depth $d$ is sufficient to provide a projected area that can withstand the axial load $P$.

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