- Ningbo Zhongli bolts manufacturing Co., Ltd. +86-574-86587617
- tan@nbzyl.com
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Precision fastening architecture driving mechanical reliability across internal combustion systems, commercial heavy-duty transport, and the electric mobility revolution.
In modern automotive engineering, the threaded rod serves as a foundational structural fastener. From cylinder head studs to exhaust manifold integration, threaded rods provide high clamp load retention under extreme cyclic thermal expansion and high-frequency vibrational stress. Alloy steel compositions like 42CrMo and 40Cr with precise heat treatment ensure zero tensile relaxation during dynamic vehicle operation.
The global transition toward Electric Vehicles (EV) introduces complex structural mounting demands. High-tensile continuous threaded studs and customized tie-bars are critically utilized to secure large-format battery pack enclosures directly to vehicle subframes. Surface treatments like multi-layer Zinc-Nickel and Geomet coatings guarantee superior electrical insulation, galvanic corrosion barrier, and 1000+ hours neutral salt spray endurance.
Heavy commercial vehicles, trucks, and articulated trailers depend on heavy-duty Grade 10.9 and 12.9 threaded rods for leaf spring U-bolt assemblies, suspension link pivots, and fifth-wheel mounting plates. Through advanced cold forging and grain-aligned thread rolling, our threaded bars deliver optimal fatigue cycle thresholds and dynamic shear resistance under severe road impact loads.
Engineered to satisfy stringent global automotive OEM specifications including ISO 898-1, ASTM A193, DIN 976, and ANSI B18.31.2.
Operating environments exceeding 650°C demand specialized metallurgy. Utilizing ASTM A193 Grade B7 chromium-molybdenum heat-treated alloy steel paired with ASTM A194 Grade 2H heavy hex nuts ensures exceptional creep resistance and yield strength over 720 MPa, eliminating joint relaxation in high-boost turbochargers and exhaust headers.
Chassis components require tight dimensional tolerances (6g/6h thread class) to integrate with robotic automated torque-angle fastening systems. Cold-formed rolled threads preserve continuous steel grain flow lines, increasing fatigue life by over 30% compared to cut threads, making them ideal for steering links, anti-roll bar end links, and subframe bracing.
Underbody automotive threaded rods face aggressive road salts, gravel impingement, and thermal cycling. Our surface finishing portfolio encompasses Hot-Dip Galvanizing (HDG), Electro-Galvanized Zinc (Clear/Yellow), Black Oxide, Fluoropolymer/PTFE anti-friction coatings, and Dacromet coating, delivering robust barrier protection without risking hydrogen embrittlement.
As automotive platforms emphasize lightweight construction without compromising crash safety, our R&D focus is on high-strength micro-alloyed carbon steels (Grades 10.9 and 12.9). These enable downsizing of fastener diameters while maintaining superior tensile breaking loads above 1220 MPa, optimizing vehicle curb weight and fuel/energy economy.
Professional Manufacturer of High-Strength Automotive & Industrial Fasteners
Ningbo Zhongli Bolts Manufacturing Co., Ltd. founded in 2003, is a professional manufacturer of high-strength fasteners in different specifications for various models, which is covering an area of about 10,000 square meters, registered capital of 1500,000 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.
Comprehensive Fastener Manufacturing Spanning ASTM, DIN, ISO, and ANSI Standards
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.
Full Cycle End-to-End Precision Manufacturing Workflow
Modern Industrial Manufacturing Hub Equipped with Multi-Station Machinery
INTRODUCTION
ABOUT COMPANY Ningbo Zhongli Bolts Manufacturing Co., Ltd. founded in 2003, is a professional manufacturer of high-strength fasteners in different specifications for various models, which covers an area of about 10,000 square meters, registered capital of 1500,000 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.
Why Leading Automotive & Industrial Buyers Choose Ningbo Zhongli
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.
We hope to establish business relationship with all over the world, and our business can bring in mutual benefits for both parties.
Comprehensive In-House Metrology & Mechanical Property Validation
To ensure compliance with automotive structural safety factors, our laboratory performs strict verification across all production stages:
Grasp first-hand information from our global industrial partners
High Strength Fasteners Engineered for Dynamic Load Bearing Applications
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