... , A249, A269 and A270, A312, ISO9000Round and embossed tube O.D. (mm)9.5 , 12.7 , 15.9 , 17 , 18 , 19. ... 42 , 45, 48 , 50 , 50.8 , 56 , 57 , 60, 63.5 , 76.2 , 80 , 89 , 101.6 , 108 , 114 , 127 , ... 133 , 141 , 159 , 168, 219Square tube side length (mm)10*10 , 12*12 , 15*15 , 18 ... as customers' requestMaterial Grade201 (Ni 1%)202 (Ni 3.5%~4.5%)301 (Ni 6%)304 (Ni 8%,Cr 18%)316 ...