In the world of mechanical engineering and power transmission, precision is everything. When designing systems involving motors, pumps, and gearboxes, the shaft is the critical component that transmits torque and rotation. While many engineers are familiar with general tolerancing standards, a specific, foundational document often sought after for designing these components is .

Specifically addresses the design of transmission shafting (rotating shafts in machinery).

: Adjusts for the statistical nature of fatigue failure (e.g., 95% reliability). (Temperature)