IRWIN supplies a broad variety of bolting products for heavy vehicle, transportation, construction, mining, petrochemical, nuclear and industrial applications. Materials include carbon steel, alloy and stainless steels, brass, copper, aluminum, silicon bronze, Hastelloy, Inconel, Monel and Nitronic 60. Thread sizes, both internal and external, from 1/4" (M6) to 4" (M100). Manufacturing processes include cold formed, hot forged, machined and powdered metal, as well as secondary operations. Many engineered coatings for harsh environment applications are available.