JB/T 10243-2001 This standard specifies the type, external dimensions, basic parameters, technical requirements, test methods, inspection rules, marking, packaging, transportation and storage of KPTH involute cylindrical gear reducer. This standard applies to KPTH involute cylindrical gear reducer. This reducer is mainly used in mine hoists, and can also be used in the transmission of machinery and equipment in metallurgy, cement, chemical industry, building materials, energy and light industry. This standard was first released in May 2001.