Matco-Norca has carbon-steel weld fittings and flanges available in 20 pipe sizes ranging from 1/2 inch through 24 inches in both standard and extra-heavy wall thicknesses. Made of high-quality carbon steel, the weld fittings and flanges are ideal for use in commercial and industrial applications. Flanges are available in standard and extra-heavy bore weld necks and socket welds, slip-ons, threaded, lap joints and blinds in 150# and 300# pressure ratings.