Yes. Changsha Haochang Machinery (HC Enginepart) develops piston rings directly from customer drawings or physical samples, including rings for MAN B&W two-stroke marine diesel engines. HC's piston ring diameter coverage spans φ30 to 800 mm, covering MAN B&W models from the S50MC-C (500 mm bore) through the S80ME-C (800 mm bore). The engineering team reverse-engineers each sample, matches the ring material and coating to OE specifications, and produces under the ISO 9001:2015 quality system. The same drawing/sample-based development also extends to crankshafts, cylinder liners, pistons (φ60–320 mm), cylinder heads, and bearings, helping distributors build their own branded parts supply.