... alloy steel 20MnTiB 2.Property Class:8. Standard:GB/T 1228-1231,ISO7412,DIN6914-6916,ASME B 18 ... 3/8"8Or according to customers’ requirements Standard: GB/T 1228-1231,ASTM A325 A490 A325M A490M1- Raw material ... )6- Thread standard : Thread length tolerance according to GB/T 3103.1-2002 - b + 2 p the rest ... of the general tolerance according to GB/T 1084 - m selection7-Size: as per your request ...