The 100316006 Thick Metal Wall Vacuum Hose is 19.69 inch (50 mm) in length with size NW40 ISO-KF vacuum flanges on each end. This unsheathed vacuum hose has a thick 0.12 in. (0.3 mm) stainless steel hose wall giving it a 110 lb./in spring rate and a 5 1/4 inch static bend radius. The static bend radius for this Series 31 vacuum hose is to the point of permanent deformation. Metal wall vacuum hose can be used in rough piping applications. We also offer thin metal wall vacuum hose for applications where compression or additional flexibility is needed.