Steel Tubes ISO 2937:1974 Plain end seamless steel tubes for mechanical application ISO 2938:1974 Hollow steel bars for machining ISO 3304:1985 Plain end seamless precision steel tubes — Technical conditions for delivery ISO 3305:1985 Plain end welded precision steel tubes — Technical conditions for delivery ISO 3306:1985 Plain end as-welded and sized precision steel tubes … Continue reading Ferrous Metal Pipes and Metallic Fittings Standards