The material used for the production of

• thread couplers made from cast steel G42CrMo4
  respectively from steel S355J2 machined, lock nuts,
  anchor nuts, domed nuts and anchor pieces
  ( anchoring elements for corresponding threaded rods )
  made from cast iron EN-GJS-500-7 respectively from
  steel C45N forged + machined

will also meet the customer specific approval requirements.