1.General 总则This document is about surface imperfections and damages in functional and non-functional areas. It can be used to judge if a part is qualified and therefore can be used for production or delivery.Conditions for visual inspection (if not otherwise specified, it is applicable for all area): Visible (naked-eyes) dirt or contamination is/are not permittedLoose or easily detachable particles (flakes / burr, etc.) are not permittedMetallic or Non-metallic fibers are not permittedVisible or palpable damages on inner surface and connection surface are not permittedVisible damages or deformation on injection surface are not permittedVisible damages on the spring holding surface are not permittedVisible or palpable damages or fluffs on working surfaces of sealing ring are not permittedVisible damages or deformation on all metal surfaces are not permittedDiscoloration of pins is not permittedVisible or palpable bumps on all surfaces are not permittedThe surface imperfections defined in this document are not related to surface roughness