Name:Ring Gear Material:4140HT Size:OEM YB has been obtained successively: AD 2000 Merkblatt W 0 + PED 97/23/EC,ISO9001-2008,China Special Equipment Production License, Keep Contracts Regard Credits Enterprise and etc Honors Qualifications. YB provide OEM parts in various materials. The machining range is: Maximum ring type �¤3000mm, Maximum shaft type 12000mm, maximum workpiece single weight 16T, minimum size tolerance: 0.007mm. Products are widely used in: aviation and aerospace, military and civilian ships, transportation, petrochemical industry and etc fields. website:https://www.ybfactory.com email:caroline@ybfactory.com Tel: 0086 531 83260061