Abstract: A method of manufacturing a tubular component including rough machining the exterior surface of a solid billet 1 to reduce the size thereof and form two flanges. An axial blind bore 6 is then machined in the billet 1, after which a probing operation is carried out on the interior surface of the bore 6 in order to check the concentricity. A straightening operation is then performed on the billet in order to reverse any curvature along the longitudinal axis. A further machining operation is then performed on the outside to reduce the wall thickness of the bore before measuring the wall thickness of the bore 6 around the circumference of the billet 1 at least at two different axial positions. The billet 1 is then checked again and a final machining operation is then performed in order to form any ports and upstands which are required.