ISO 413:1974 Preview
Aircraft -- Heads of lubricating nipples
This standard was last reviewed and confirmed in 2012. Therefore this version remains current.
Specifies the envelope dimensions of axial type nipples and determines the clearance space which shall be provided in the region of the nipple to allow the lubricating gun to be connected, and the operating angle dimensions for the lubricating process. The tip design of the nipples is optional provided the profile remains within the envelope shown in figure 1.