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Are DTIs Made to go with Weathering Steel (Type 3)?

April 26, 2017dtis steel type weathering

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Are DTIs Made to go with Weathering Steel (Type 3)?

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Weathering Steel (Type 3) is steel that has had lots of copper, chromium, and nickel added to enable the surface oxide layer to reach a stable thickness under normal atmospheric weathering. Many bridges, for instance, are constructed from weathering steel, and are therefore left uncoated. Bolts in weathering steel bridges are also made from a weathering steel grade. DTI’s are used with weathering steel (also called “Type 3″) bolts. Usually, the DTIs are manufactured in Type III steel also for these applications. Applied Bolting makes 3/4″, 7/8″, and 1″ DTIs out of Type 3 steel both in standard DTI form and in Squirter® DTI form. Occasionally, bolts of a size different from 3/4″, 7/8″, and 1” are specified as Type 3 and DTI’s to match are requested. In these cases, dacrotized (ASTM F1136) and black polymer coated DTIs are available for use on weathering steel bolts.