... -attachent nutthe production of the cross-arm,bottom flange,tensile flange ladder attachment nutwith the automatic numerical control cutting ... machine ,cut the accurate plates ,bottom flange bore drilling machine to drill the holeslong boltweld all ... together and weld carefullyH08A,H08MnA welding wirejoin the pole,flange and cross-arm togetherHJ431welding fluxhot dip galvanization and ...