This standard specifies the product classification and codes, requirements, test methods, inspection rules, marking, packaging, transportation and storage of cotton ring spinning spindles. This standard applies to cotton spinning ring spinning spindles with bearing inner diameters of φ6.8mm and φ7.8mm, and also applies to cotton spinning ring twisting spindles with bearings of φ6.8mm and φ7.8mm (hereinafter referred to as spindles).