ASTM B165 SMLS Tube Company: Seamless ASTM B165 UNS N04400, Monel 400 Tube, Outer Diameter 9.53-31.8 mm, Wall Thickness 0.889-6.35 mm, Cold-worked Process. Grades: UNS N04400, Monel 400. Outer Diameter: 9.53 to 31.8 mm. Wall Thickness: 0.889 to 6.35 mm. Manufacturing: cold-worked.