Good afternoon . Interested in placing order to manufacture piston rings from cast iron x the diameter of the sleeve 155.65 mm. for the engine ASH-62IR aircraft an-2 ,and spark plugs.Ring of the cone ,without.Also need marking according to the pattern.Ring in two sizes.The samples provide.The elasticity of the ring after processing the 3.4-4.3 kg.The surface of the rings,in addition to working,must be covered with a layer of Borisovo chromium 0.1 to 0.15 mm and oxidized.Quckie more spare parts for the engine Y-5 can deliver?You just need to set the conditions for a positive solution.Thanks in advance for your answer.Kuchinsky Aleksandr Vladimirovich.The Republic Of Kazakhstan.tel.+79126356177 or +77755225354.kokshereaktiv@mail.ru