Berges® Spring tension Pulley with torque control type D400b for use with wide belts type CW-b 83 and adjusting pulley R400b. Diameter of 420 mm with length through bore 250mm, die cast aluminum sheave faces with steel slide hub. Identified by casting numbers x and x, one spring; castings used on other series of pulleys.. Maximum shaft diameter 65mm with standard bores listed for sale, alternative bores are available contact TVT for non-standard bore quotation.