... , 52300, 52400, 53200, 53300, 53400, 54200, 54300, 54400 series standard types and 511/500 512/500 510/500 593/500 511 ... /630 511/670 510/670 572/710 592/710 series non-standard series.2. Material: GCr153. Application: Oil drilling machines, ... driving machines, overhead cranes, heavy tower crane turntables, and turntables of drilling machines and so on.B. specifications1. Certification: ISO9001- 2008 ...