Sizes standards material
89*4.5-10
114*5-10 gb/t8163-1999 20#, st37, q345b,
140*5-14 gb/t8162-1999 st52
168*6-20 astm a106/ a53 grade b/a and others common
219*6-25 japanese standards. Germany material equivalent
273*6-25 standards, european standards. Common standards
325*6-25 russia standards and other
355*6-25 common standards.
406*8-25
457*8-25
508*8-25
558*8-25
609*8-20