Bar & Tube Stock C&A Machine carries a substantial variety of Bar & Tube Stock from ¼”to 6” Diameter. Sufficient supplies and materials are kept in inventory at our Newington, CT facility. C&A Machine Certified Materials: Alloy Steel Aircraft Alloy Steel Aluminum Carbon Steel Inconel Stainless Steel Aluminum Materials Turned: 300 400 Stainless Steel 13-8ph 15-5ph 17-4ph Inconel - High Temp Alloys Bearing Quality Steel