SF 12x1000WERB SF 12x1000 Linear Round Shaft 12 mm x 1000 mm Hardened Shaft for Linear Motion The WERB SF 12x1000 linear round shaft is a 12 mm diameter, 1000 mm long hardened and ground shaft for miniature and light duty linear motion systems. It is designed to work with linear bearings and shaft supports on small CNC machines and automation stages across Pakistan. As the authorised WERB linear motion supplier, Abdul Traders keeps SF 12x1000 shafts in stock