powder metallurgy sun gear 1.metal gears:iron stainless steel 2.Size:1- ... 3.Small module,complexity 4.OEM,Non-standard Powder metallurgy sun gear materialsizesteel,iron,304,316,45#,15#,A3,FN0208.SMF5020 ... includes: bevel gear, gear, gear box, planetary gear, gear sector, sun gear, straight helical gear, helical gear, multi-layer gears, miniature ...