DIN, Mechanical systems and components of general use, Fasteners, Bolts, screws, studs, Nuts, Washers, Spacers, Rivets, Pins, nails, Rings, bushes, sleeves, collars, Shafts and couplings, Keys and keyways, splines, Lubrication systems, Lubricators, Fluid systems and components of general use, Pipeline components and pipelines, Flanges, couplings and joints, Weld-on plain flanges, Losse plain flanges, Weld-on plain collar, Blind flanges, Weld-on neck flanges, Weld-neck collars, Weld-on or threaded hubbed neck flanges, Plain or threaded plain oval flanges, Materials handling equipment, Lifting equipment, Accessories for lifting equipment, Petroleum and related technologies, Equipment for petroleum and natural gas industries, Flanges, Metallurgy, Iron and steel products, Profiles,