Founded in the year 2000, Ruian Zhuoning Fastener Co., Ltd. is a specialized manufacturer of high-strength automotive fasteners located in Ruian, Wenzhou - one of China's most established fastener production clusters. With over 26 years of dedicated experience, we have built our reputation on precision knurled bolts, wheel hub studs, and custom non-standard fasteners for the global automotive aftermarket. We are capable of producing bolts up to Grade 14.9 and offer specialized surface hardening treatments to meet the most demanding performance requirements. Zhuoning started as a small workshop focused on cold-formed bolts for the domestic automotive parts market. Over the past two decades, we have steadily upgraded our production capabilities, evolving from basic standard fasteners to high-precision, high-strength automotive bolts rated at Grade 10.9, 12.9, and even 14.9 for extreme-load applications. Today, our products serve as critical components in suspension strut mounts, wheel assemblies, and chassis systems for passenger vehicles and commercial trucks. Throughout our 26-year history, we have maintained long-term partnerships with leading domestic automotive suspension system manufacturers, supplying knurled press-in stud bolts and wheel hub bolts that are used in original equipment and aftermarket applications across Asia, the Middle East, and Latin America. Our core product range includes knurled press-in stud bolts for MacPherson strut mounts (M8 to M22, Grade 10.9/12.9), wheel hub bolts and wheel lug studs for passenger cars and heavy trucks, custom non-standard high-strength bolts manufactured to customer drawings or samples, precision cold-formed fasteners in carbon steel and alloy steel (40Cr, 42CrMo, SCM435), and ultra-high-strength bolts rated at Grade 14.9 for heavy-duty and extreme-load applications. We operate a complete in-house production line covering cold heading, knurling, thread rolling, and heat treatment. Surface finishing options include zinc plating, black oxide, and Dacromet coating through our qualified partner facilities. In addition, we provide specialized surface hardening treatments - including case hardening and induction hardening - to significantly enhance surface wear resistance and service life of our fasteners. All products undergo dimensional inspection and hardness testing before shipment. Zhuoning holds ISO 9001 certification and follows strict quality control procedures at every stage of production. Our experienced technical team ensures that each order receives close attention and consistent quality, from raw material selection through final inspection. We specialize in low-to-medium volume custom orders with flexible MOQ, making us an ideal partner for buyers who need tailored fastener solutions without the minimum order requirements of large-scale factories. Over 26 years in the fastener industry, we have successfully developed and delivered thousands of custom bolt specifications for automotive suspension and chassis applications. Our knurled bolts are trusted by established suspension system manufacturers as a reliable component in their assembled products sold worldwide. We have built a proven track record of on-time delivery and consistent product quality that keeps our partners coming back. We are now expanding our reach to international markets. With competitive pricing rooted in lean operations, deep technical expertise in automotive fasteners, advanced surface hardening capabilities, and the ability to handle custom orders efficiently, Zhuoning is well positioned to serve global buyers seeking a reliable, quality-focused fastener supplier from China's premier fastener region. We welcome inquiries from importers, distributors, and automotive aftermarket buyers worldwide and look forward to building lasting partnerships.