Our hydraulic pipe mainly are cold drawn or cold roll precision seamless pipes or welding pipes,can be used for hydraulic cylinders, industry Jacks, automotive shock absorbers, and others. The tolerance can be minimized to +/-0.02mm, +/-0.015 for the Inner diameter. Material can be carbon and alloy steel. We can also apply it to hone for the inner surface. Good mechanical performance and good inner surface condition. Ra can reach 0.3um.