Berges® Spring Tensioning pulley type F151sb interchange with Lenze® Simplabelt size 11.104.10.6.1. for use with wide belts type CW-b 28 and fixed diameter pulley, speed change achieved by changing center distance between sheaves. Diameter 156mm with length through bore of 94mm, one spring on each side of pulley for a total of two springs. Identified by casting numbers 11000314 and 11000315 stamped on pulley faces; castings also used on other series of pulleys. Maximum shaft diameter 28mm with standard bores listed for sale, alternative bores are available contact TVT for non-standard bore quotation.