PROCEDURE Screw Dia, Barrel I.D. is thoroughly checked within tolerance between Screw & Barrel in microns. Materials are Toughened/ Hardened as per specification for the purpose of running Screw Barrel. Final Inspection is done after Nitriding/Hardening Process. So Screw Barrel can be directly assembled in Machine. Final product is packed in Wooden Box. Packing is done to preserve in better way.