- Ningbo Zhongli bolts manufacturing Co., Ltd. +86-574-86587617
- tan@nbzyl.com
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Our Core Products
Local Market Insight
Doha, the capital of Qatar, is one of the fastest-growing cities in the Middle East. Driven by massive infrastructure investments — including the FIFA World Cup 2022 legacy projects, Lusail City development, the Doha Metro expansion, and the ongoing National Vision 2030 — the demand for high-quality structural fasteners and washers has surged dramatically. Structural washers play a critical role in ensuring the safety and longevity of steel-frame buildings, bridges, industrial facilities, and energy infrastructure across the region.
Qatar's construction industry is valued at over $200 billion in planned projects. High-rise towers, stadiums, and commercial complexes require large volumes of structural-grade washers compliant with DIN and ASTM standards to meet international engineering codes.
As a leading LNG exporter, Qatar's petrochemical plants and offshore platforms demand heavy-duty structural washers with hot-dip galvanized or black oxide coatings to withstand high-pressure, corrosive environments — a specialty of Zhongli's product range.
The Doha Metro, Hamad Port, and New Orbital Highway projects consume significant quantities of structural fasteners. Washers compliant with EN14399 and DIN6916 are essential for bolted steel connections in these critical transport hubs.
Application Scenarios
Structural washers (DIN6916, ASTM F436) are used in steel frame connections for Doha's iconic skyscrapers and mixed-use developments, ensuring load distribution and preventing bolt loosening under dynamic loads.
Hot-dip galvanized structural washers protect against Qatar's humid coastal climate, providing corrosion resistance in bridge girder and expansion joint assemblies across major road networks.
High-strength washers in Grade 10.9 and 12.9 are critical for flanged pipe connections and pressure vessel assemblies in Qatar's industrial zones at Mesaieed and Ras Laffan.
Spring washers DIN127 and flat washers DIN125 are widely used in electrical substation structures and transmission tower assemblies, ensuring vibration resistance in Qatar's expanding power grid.
Industry Outlook
Qatar and GCC procurement authorities increasingly mandate internationally certified fasteners (ISO, DIN, ASTM, EN). Suppliers must hold ISO 9001, CE, and EN14399 certifications to qualify for government and mega-project tenders.
Qatar's push for LEED-certified buildings drives demand for eco-friendly surface treatments on washers — including zinc-nickel alloy plating and water-based coatings that reduce environmental impact while maintaining corrosion resistance.
Qatar's National Vision 2030 promotes local sourcing and supply chain resilience. Partnering with established Chinese manufacturers like Zhongli — with dedicated Middle East export experience — ensures reliable supply at competitive pricing.
Advanced cold-forging automation and digital quality traceability systems are becoming standard. Zhongli's fully automatic multi-station cold and hot heading machines ensure consistent dimensional accuracy across every batch.
Qatar's coastal and desert environment demands enhanced corrosion protection. Hot-dip galvanized washers and zinc-plated spring washers from Zhongli are specifically engineered to outperform in high-humidity, salt-laden atmospheres.
Mega-projects in Doha increasingly require custom-specification washers beyond standard sizes. Zhongli's engineering team supports non-standard fastener customization from M10 to M48, with unlimited length options.
Ningbo Zhongli Bolts Manufacturing Co., Ltd., founded in 2003, is a professional manufacturer of high-strength fasteners in different specifications for various models. The company covers an area of about 10,000 square meters, with a registered capital of 1,500,000 RMB and a total annual productivity of 8,000 tons per year.
The company has established several sales branches across different provinces in China, while its products are exported to Europe, USA, the Middle East, Africa, Southeast Asia, and other regions — including an established presence serving the Doha and broader Qatar market.
With strong technical capability, complete testing equipment, and a variety of fully automatic multi-station cold and hot heading machines, Zhongli is committed to delivering reliable, high-quality structural washers and fasteners to partners worldwide.
Read More About UsProduct Range
Our main products under the ZYL brand 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 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 reach ISO 898-1 for bolts and ISO 898-2 for nuts. Through scientific management, Ningbo Zhongli Bolts Manufacturing Co., Ltd. has obtained the ISO 9001 certificate of Quality Management System. We have strict production and inspection equipment to support this commitment.
We hope to establish business relationships with partners all over the world, and our business can bring mutual benefits for both parties.
How We Make It
Our Facility
Why Choose Us
A Professional Sales and Technical Team with More Than 20 Years History.
We Have Our Own Testing Equipment and Laboratory with Initial, Patrol, 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.
Customer First
We hope to establish business relationships with partners all over the world, and our business can bring mutual benefits for both parties.
Quality Assurance
EN 15048 CE Certification · EN14399 CE Certification · ISO9001 Certificate
Grasp First-Hand Information
Complete Washer & Fastener Series
Get competitive pricing, ISO-certified quality, and fast delivery to Qatar and the wider GCC region. Contact our team today for a custom quote.
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