Provides requirements for sidepocket mandrels used in the petroleum and natural gas industry. API 19G1 includes specifying, selecting, designing, manufacturing, quality control, testing, and preparation for shipping of side-pocket mandrels. This specification does not address nor include requirements for end connections between the side-pocket mandrels and the well conduit. The installation and retrieval of side-pocket mandrels is outside the scope of this part of ISO 17078. Additionally, this Internatinal Standard does not include specifications for center-set mandrels, or mandrels that employ or support tubing-retrievable flow control devices. This specification does not include gas-lift or any other flow-control valves or devices, latches, and/or associated wire line equipment that may or may not be covered in other ISO specifications. The side-pocket mandrels to which this specification refers are independent devices that can accept installation of flow control or other devices down-hole.