Home | NSA Stainless Steel, Nickel Alloy Bars & Precision Shafts. Stocking specialty grade, high-performance, and corrosion-resistant alloys for over 35 years. Your single source … Stainless Steel, Nickel Alloy Bars & Precision Shafts. Stocking specialty grade, high-performance, and corrosion-resistant alloys for over 35 years. Your single source …