JIS

Hydraulic fluid power -- Dimensions and identification code for mounting flanges and shaft ends of displacement pumps and motors -- Part 1: Inch series shown in metric units (FOREIGN STANDARD)
standard by Japanese Industrial Standard / Japanese Standards Association, 01/01/2005

Screwed type steel pipe fittings (Foreign Standard)
standard by Japanese Industrial Standard / Japanese Standards Association, 01/01/2013

Steel butt-welding pipe fittings for ordinary use
standard by Japanese Industrial Standard / Japanese Standards Association, 01/01/1997

Steel butt-welding pipe fittings (Amendment 1)
Amendment by Japanese Industrial Standard / Japanese Standards Association, 01/01/2001