En standard Materials: ASTM a-197, ASTM A47 Dimensions: ISO49,DIN2950 Threads: ISO7/1 Size available:1/8''-6'' We can supply American standard, British standard, en standard, and other special requirements. Both class 150# and class 300# available, and size ranges from 1/8" to 6". The brief introduction as follows: American standardMaterials: ASTM a-197, ASTM A47Dimensions: Asme b16.3, b16.14, ...