- Ningbo Zhongli bolts manufacturing Co., Ltd. +86-574-86587617
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Precision-engineered high-strength structural bolts designed to withstand the extreme pressures, temperatures, and corrosive environments found in oil & gas infrastructure worldwide.
The global oil & gas sector demands fastening solutions that perform reliably under extreme conditions. Structural bolts are the silent backbone of every pipeline, refinery, drilling platform, and LNG terminal worldwide.
In oil & gas applications, a single fastener failure can result in catastrophic leaks, fires, or structural collapse. High-strength structural bolts conforming to ASTM A193 B7, A325, A490 and EN14399 standards are not optional — they are mandatory safety-critical components in every upstream, midstream, and downstream facility. With global oil & gas capital expenditure exceeding $500 billion annually, the demand for certified, traceable, and high-performance structural fasteners has never been greater.
Drilling rigs, wellhead assemblies, and subsea structures require Grade 10.9 and Grade 12.9 hex bolts and ASTM A193 B7 stud bolts capable of withstanding dynamic loads, high pressures, and corrosive seawater environments at depths exceeding 3,000 meters.
Thousands of kilometers of high-pressure pipelines rely on DIN6914 structural hex bolts and ASTM A325 heavy bolts for flange connections, valve assemblies, and pump stations. Corrosion-resistant coatings such as hot-dip galvanizing are essential for buried and exposed pipeline sections.
Refineries and petrochemical plants operate at elevated temperatures and pressures. ASTM A193 B7 stud bolts with 2H heavy hex nuts are the industry standard for heat exchangers, pressure vessels, reactors, and distillation columns operating above 400°C.
From Arctic drilling platforms to tropical LNG terminals, structural bolts from Zhongli are engineered to perform across the full spectrum of oil & gas environments.
Offshore oil platforms represent one of the most demanding environments for structural fasteners. Constant wave loading, salt spray corrosion, and extreme temperature cycling demand bolts with exceptional fatigue resistance and corrosion protection.
Zhongli's DIN6914 structural hex bolts in Grade 10.9 with hot-dip galvanized coating (85μm minimum) are widely used in offshore jacket structures, topsides, and helideck platforms. ASTM A193 B7 stud bolts with PTFE coating provide superior corrosion protection for subsea flange connections.
Refinery process equipment operates under conditions that push conventional carbon steel bolts to their limits. Hydrogen embrittlement, stress corrosion cracking, and thermal fatigue are the primary failure modes that Zhongli's engineered fastener solutions are designed to address.
ASTM A193 B7 alloy steel stud bolts (chromium-molybdenum steel, quenched and tempered) maintain their mechanical properties up to 450°C, making them ideal for high-pressure heat exchangers, hydrocracker reactors, and crude distillation unit flanges. For even higher temperatures, A193 B16 grade provides reliable service up to 540°C.
The structural bolt market for oil & gas is evolving rapidly, driven by energy transition demands, digitalization, and increasingly stringent safety regulations.
Global LNG capacity is projected to grow by over 40% by 2030, driven by energy security concerns in Europe and Asia. Each LNG terminal requires millions of structural bolts for liquefaction trains, storage tanks, jetty structures, and loading arms. Zhongli's EN14399 certified structural bolts are increasingly specified for these mega-projects.
As shallow-water reserves deplete, operators are pushing into deepwater (300–1,500m) and ultra-deepwater (1,500m+) developments. These environments require fasteners with enhanced corrosion resistance, higher strength grades, and full material traceability. Demand for subsea-grade A193 B7 stud bolts with electroless nickel plating is growing at 12% annually.
The emerging hydrogen economy is creating new demand for hydrogen-compatible fasteners. Green hydrogen production facilities, carbon capture systems, and blue hydrogen pipelines require bolts with specific hydrogen embrittlement resistance. ASTM A193 B7M (modified, lower hardness) is increasingly specified for hydrogen service applications.
Major oil & gas operators now demand full digital traceability for safety-critical fasteners, including material test reports (MTR), heat number tracking, and QR code-based certification. Zhongli's ISO 9001 quality system supports complete batch traceability from raw material to finished product, meeting the most stringent procurement specifications.
Following major industrial incidents, regulatory bodies worldwide are tightening fastener certification requirements. The adoption of NORSOK M-630 for subsea fasteners, API 20E for alloy steel bolting, and PED 2014/68/EU for European pressure equipment is driving demand for pre-certified, traceable structural bolts with third-party inspection.
The Asia-Pacific region, led by China, India, and Southeast Asia, is experiencing rapid growth in refinery capacity and petrochemical investment. The Middle East continues to expand upstream production infrastructure. These regions represent the fastest-growing markets for structural bolts, with combined annual demand exceeding 200,000 metric tons.
ZYL brand fasteners cover the full spectrum of standards and specifications required by oil & gas engineering procurement and construction (EPC) contractors worldwide.
Our main products ZYL brand fasteners include structural hex bolts ASTM A325 type 1, A490, hex head bolts DIN931, DIN933, EN14399, DIN6914, ISO4014, ISO4017 Gr8.8 Gr10.9 Gr12.9, ANSI B18.2.1 UNC and UNF Gr5, Gr8, fine pitch hex bolts DIN960, DIN961 Gr8.8 Gr10.9 Gr12.9, hex socket cap screws DIN912, ISO4762 Gr8.8 Gr10.9 Gr12.9 with surface Black, Zinc plated, Hot dip galvanized. Diameters from M10 to M48, length no limited. Hex Flange bolts DIN6921 Gr8.8 Gr10.9 with serration, thread rod A193 B7 long sizes and short sizes with 2H nuts, stud bolts. We also can supply hex nuts DIN934, DIN6915, plain washers DIN125, DIN126, DIN6916, spring washers DIN127 with Black, Zinc plated and Hot dip galvanized surface.
Our physical and mechanical test results can reach to ISO898-1 for bolts and ISO898-2 for nuts.
Through scientific management, Ningbo Zhongli Bolts Manufacturing Co., Ltd. obtained ISO9001 certificate of Quality Management System. Quality is the most important for us. We have strict production and inspection equipments to support this point.
We hope to establish business relationship with all over the world, and our business can bring in mutual benefits for both parties.
Ningbo Zhongli Bolts Manufacturing Co., Ltd., founded in 2003, is a professional manufacturer of high-strength fasteners in different specifications for various models, covering an area of about 10,000 square meters, registered capital of 1,500,000 RMB, with the total annual productivity of 8,000 tons per year.
The company has set up several sales branches in different provinces in China. Meanwhile, the company's products are exported to Europe, USA, Middle East, Africa, Southeast Asia and other regions. The company has strong technical ability, complete testing equipments and a variety of fully automatic multi-station cold and hot heading machines, so as to provide you with reliable and high quality products.
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Every structural bolt for oil & gas applications undergoes a rigorous 8-stage manufacturing process, from certified raw material intake to final inspection and containerized export.
Our 10,000 m² state-of-the-art manufacturing facility is equipped with fully automatic multi-station cold and hot heading machines, ensuring consistent quality for every structural bolt produced.
Why leading oil & gas EPC contractors and operators worldwide choose Zhongli structural bolts for their critical applications.
A Professional Sales and Technical Team with More Than 20 Years History.
We Have Our Own Testing Equipment and Laboratory, Our Products Have Initial Inspection, Patrol Inspection, And Final Inspection.
Our Factory Has Its Own Cold Forged, Hot Forged, And Heat Treatment Equipment.
Standard Fasteners in Stock, Non-standard Fasteners Can Be Customized.
We Have Passed ISO 9001, EN 15048, EN 14399, AD2000 and CE Certificates.
Every structural bolt destined for oil & gas applications undergoes a comprehensive three-stage inspection protocol. Our in-house laboratory is equipped with advanced dimensional measurement, mechanical testing, and hardness testing equipment, ensuring every batch meets or exceeds the specified standard requirements.
We hope to establish business relationship with all over the world, and our business can bring in mutual benefits for both parties.
EN 15048 CE Certification, EN14399 CE Certification, ISO9001 Certificate — Your guarantee of quality and compliance for oil & gas structural bolts.
Grasp first-hand information — what oil & gas professionals worldwide say about Zhongli structural bolts.
Explore our complete range of high-strength structural fasteners — all manufactured to international standards and certified for critical oil & gas applications.
Contact Zhongli Bolts today for competitive pricing, free samples, and full technical support. We supply certified structural fasteners to EPC contractors and operators worldwide.
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