GB 1152 - 1989Straight Hydraulic Grease Nipples 58 [ASTM] ASTMHex Head Plug For Heat Exchanger 59 [GOST] GOST 19853 (Type 1) - 1974Lubricating plugs - Type 1 60 [SAE] SAE AS 4862 - 1995 (R2007)Plug pipe external thread,Hex head ...