End Cover for Pinion Shaft Alloy Steel Gear Shaft End Cap for Oil Drilling Product Description End Cover for Pinion Shaft is a precision-machined alloy steel component used for oilfield transmission and drawwork systems. It functions to seal the gearbox, fix the pinion shaft assembly, prevent lubricant leakage and block dust, mud and other contaminants from entering the transmission chamber. Fabricated from high-strength alloy steel, the end cover undergoes strict heat