AUTO Stoßdämpfer für TOYOTA CORONA / ST191 / 33311

1 Piston rod:material-steel with 0.45% carbon on average. Chrome treatment:HV>900; 0.15---0.10mm Surface roughness:Ra:0.070.08 Grackle forming treatment, heat treatment (quench hardening), and thread forming treatment to harden the piston rod and extend its life span, Phosphate treatment on the loading end as anti-rusting. 2 pressure tube:steel with 20% carbon on average,cold pilger rolling(rolled precision seamless steel tubes) 3 oil seal:the top qualoty extorted seals form Japan.NOK Material: butadiene-acrylonitrile rubber the function of resisting heat and wear,strong bond force. 4 parts made by the powder:powder metallurgy(PM).All the parts made in a time to guarantee the stength of the parts. Piston; light or black (steam treatment to remove all the burrs and strengthen the function) 5 welding:spot welding seam welding weld reinforcement Painting:totally-enclosed automatic painting system; B:All the production machines and the testing facilities are offered by the professional factories. C:Before delivering the goods to the customers .the final produce quality control testing must be undertaken 100% damp testing .5% of the products must be taken the endurance test .In this way . We can guarantee the quality of all the products we send to our customers .