Core Viewpoint - Tianrun Industrial (002283.SZ) primarily produces crankshafts and connecting rods for engine manufacturers, with a smaller portion of revenue coming from its casting and forging business, which includes components for engineering machinery [1] Group 1 - The main products of the company are crankshafts and connecting rods, which are supplied to engine manufacturers [1] - The casting and forging business includes planetary wheel frames, housings, lifting arms, and brackets, which are engineering machinery components [1] - The revenue from the casting and forging business constitutes a small proportion of the company's total revenue [1]