Butt Welded Fittings Butt Welded Fittings Stainless Steel Butt Weld Fittings are manufactured according to ASTM A403/403MAvailable in grades WP304/304L and WP316/316LAvailable in Seamless and Welded TypesType Ranges from Elbows, Straight Tees, Reducers, Caps, Etc. Download Brochure