Alpha overseas serves as an established supplier and manufacturer of ss 321 / 321h fittings designed for compression tubing. Ss 321 / 321h You can find an assortment of compression tube fittings Provided in an assortment of sizes and grades to satisfy the industry s rising demand. The products we provide include often sold to several customers worldwide as a result of their high quality. Alternatively hand, The ss 321 / 321h compression tube fittings are produced with excellent surface finishes and precise dimensional tolerances. The stainless steel 321 exhibits toughness over a wide temperature range, And does has excellent, Not need forming properties to be annealed after welding.