... material--40Cr,After forging quenching and tempering,Bolts level--12.9 high strength bolts,Surface flow--Nitriding, polishing, heat treatment ... plate seals, rubber seals to adapt with the pipe size.9.Caterpillar haul off:adjusting method--pneumatic compress device,Equipped with ... a meter installation, meter size is accurate, the length of any set.10.Cutting ...