Products for wind power projects: stainless steel product series; high-strength nut series; high-strength bolt assemblies for steel structures; and specialized bolt series for petrochemical, automotive, and steam turbine applications.
Zhejiang Zhoushan Zhengyuan Standard Parts Co., Ltd. is a specialized manufacturer of standard fasteners based in the Shenjiamen Marine Biological Industrial Park, Putuo District, Zhoushan, Zhejiang, China, operating as a state-approved legal entity with independent import and export rights. With fixed assets of RMB 120 million, a registered capital of RMB 36 million, a 23,000-square-meter facility, and an annual production capacity of 26,000 tons, the company employs 260 staff, including over 80 mid- and senior-level technical professionals. Strategically located near the nation’s largest fishing port, Shenjiamen, and facing the scenic Putuo Mountain and Zhujiajian Island, it benefits from convenient transportation and a pleasant coastal environment. The company holds numerous prestigious memberships and roles—including seats on the National Technical Committee for Fastener Standardization and the National Technical Committee for Pipe Fitting Standardization, as well as memberships in the Wind Machinery Branch of the China Agricultural Machinery Industry Association, the China Steel Structure Association, the China Heat Treatment Industry Association, and the China General Machinery Components Industry Association, among others—and has participated in drafting multiple national fastener standards. Its extensive product portfolio covers hot- and cold-forged hex nuts, bolts, stainless steel fasteners, non-standard special-shaped parts, locking fasteners (bolts, nuts, studs, washers, rigging), and dominant lines such as wind energy products, bridge and high-speed train components, petrochemical and power parts, aviation turbine and marine railway products, and nuclear and military-grade fasteners, complying with GB, ISO, ANSI, JIS, DIN, BS, UNI, AS, CNS, SH, HG, and automotive standards, with sizes from M3–M200 and 1/2″–5″, nut grades 8–12 and bolt grades 8.8–12.9, and surface treatments including hot-dip galvanizing, electroplating, Dacromet, Teflon (PTFE), and various coatings, using materials like stainless steel 304, 316, 316Ti, 2205, 1.4507, 660, TX190, alloy steels SCM435, SCM440, 20MnTiB, 35VB, 35CrMo, 42CrMo, 40CrNiMo, 40Cr, B7, B16, L7, and carbon steels 45#, 35#, 20#, and A3. With over 40 years of manufacturing expertise, the company leverages five advanced production lines (hot-forged nut, hot-forged bolt, cold-heading, threaded rod, and heat treatment) alongside three core centers (Zhengyuan Technology Center, Employee Training Center, and CNC Machining Center), and its subordinate physical and chemical metrology and testing center is equipped with state-of-the-art inspection equipment for material chemical analysis, metallography, mechanical and physical performance testing, non-destructive testing, anti-corrosion evaluation, and gauge calibration, ensuring rigorous quality control. Backed by an ISO 9001-certified quality system, robust management, and a reputation as Zhejiang’s first "Green Enterprise" and holder of a provincial famous trademark, the company exports extensively to North America, Europe, South Korea, Japan, Southeast Asia, and Taiwan, while also serving all domestic provinces and regions. Committed to the principles of "quality first, customer foremost" and driven by a corporate spirit of integrity, innovation, perseverance, and excellence, the company—under Chairman and General Manager Lin Zhongyue—continues to accelerate reform and innovation, aiming to become a globally recognized leader in the fastener industry by delivering first-class products, superior service, and competitive prices, and by fostering lasting partnerships with clients worldwide.