... standard 4,Pipes pipe fittings & flanges 5Carbon steel and stainless steel Carbon Steel & Stainless Steel Flanges according to ASTM, DIN, JIS, BS ... standard, size: 1/2"~60", Figure 8, spade, spacer, ... Large tongue & Groove,Small tongue& Groove Materials:Carbon Steel Materials:ASTM A105-ASTM A350 LF2/ASTM A694 F42-F52 ...