求翻译 起重机械专业 起重机械方面

i’m interested to buy in china the following categories (有兴趣以下东西) 1)? ??? carpentries??----求翻译 a)? ?? ?we need a suppliers who’re already workings for customers in the earth moving market and construction equipment (jcb, caterpillar, houlotte, genie, zoomlion, jlg etc.) so it mean that they must already be qualified as a certified supplier by a customer in these markets??---------有和jcb，genie,zoomlin jlg等合作经验 b)? ?? ?who produces welded steel parts as welded chassis, crane’s arms etc.? ?----求翻译 c)? ?? ? they must be able to provide steel parts with thickness up to 50 mm, maximum weight up to 4,0 ton and maximum length of 7mt (arms) -求翻译. d)? ?? ?they must be able to provide turned parts (pins and bushings) -求翻译. 2)? ?? ?counting weights (like the ones for forklifts, from 300 kg to 4000 kg) -求翻译. 3)? ?? ?wheels??(solid tyre, cuscion and tyre filled)??-求翻译. 多谢