
Tolerance of couplings refers to the permissible dimensional and positional deviations designed for mechanical transmission components, serving as a core standard to balance assembly accuracy and operational stability in industrial systems. In practical mechanical operation, shaft installation errors, mechanical vibration and operational thermal expansion inevitably cause minor misalignment between connected shafts, including angular, parallel and axial deviations. Reasonable coupling tolerance allows flexible compensation for these subtle deviations without disrupting normal torque transmission. It effectively buffers mechanical shock and vibration, reduces abrasion on bearings, seals and other core parts, and avoids premature equipment wear or operational failure. Strict tolerance control guarantees consistent running precision of transmission systems, improves assembly efficiency by accommodating minor manufacturing and installation errors, and extends the overall service life of mechanical equipment while maintaining stable and efficient long-term operation.