Tianjin Pingyuan International Trade Co. Tianj... is a manufacturer mainly in production of various washers and metal stamping parts. 1. washer range covers flat washers , spring washer, squre bevel washer, load indication, and high-strength washer according to DIN, BS, NFE, AS, and USS standard. We also supply special washers as per buyers demand. We provide surface treatment as like plain, zinc plating, black, HDG etc for such materials as low carbon steel, mid-carbon steel, stainless steel, brass, cooper etc . 2.We produce metal stamping parts of different material with the color of plain , Z/P, HDG, black or as per buyerâ??s instructions. 3. we also produce all kinds of screws.</p>