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Precision-engineered high-strength fasteners for reliable equipment mounting applications across industrial and commercial sectors.
Fine Thread Hex Bolt DIN960 Black Grade 10.9 — High Strength Equipment Mounting Bolt
Stud Bolt ASTM A193 Grade B7 Thread Rod — M30 Equipment Mounting Stud
Hexagon Head Bolt Fine Coarse Thread UNC & UNF — Equipment Mounting Hex Bolt
Threaded Metal Studs and Rods B7 — Black Double Head Equipment Mounting Bolt
Understanding the engineering advantage behind serrated flange bolts for equipment mounting applications.
A serrated flange bolt (DIN6921) is a hex head bolt integrated with a wide circular flange beneath the head. The underside of this flange features radially oriented serrations — fine, sharp ridges that bite into the mating surface upon tightening, creating a mechanical lock that dramatically resists loosening due to vibration, dynamic loads, and thermal cycling.
Unlike standard hex bolts requiring a separate washer, the serrated flange bolt combines the clamping function of a washer and the anti-loosening function of a lock washer into a single, compact fastener. This reduces part count, simplifies assembly, and improves consistency in equipment mounting operations.
Available in Grade 8.8 and Grade 10.9, with surfaces including black oxide, zinc plated, and hot-dip galvanized, Zhongli's serrated flange bolts conform to DIN6921 and are widely specified across global industrial equipment mounting applications.
Four core performance advantages that make serrated flange bolts the preferred choice for demanding equipment mounting environments.
The serrated flange teeth embed into the mating surface, providing mechanical resistance to vibration-induced loosening — critical in rotating machinery and engine mounting.
The wide flange distributes clamping load over a larger bearing area, eliminating the need for a separate washer and reducing total assembly time and cost.
Available in Grade 8.8 and Grade 10.9 per DIN6921, suitable for heavy-duty equipment mounting where high preload and clamping force are essential.
Black oxide, zinc plated, and hot-dip galvanized options ensure corrosion resistance across indoor, outdoor, and marine equipment mounting environments.
From automotive manufacturing to renewable energy, serrated flange bolts are indispensable across high-value equipment mounting scenarios worldwide.
Serrated flange bolts are extensively used in engine brackets, transmission housing, suspension sub-frames, and body panel mounting fixtures. The vibration-resistant serration prevents bolt loosening in high-frequency engine environments, ensuring long-term safety and reducing maintenance intervals in production line equipment.
Wind turbine nacelle assemblies, generator base frames, and transformer mounting structures rely on serrated flange bolts to maintain preload integrity under continuous vibration and thermal cycling. In solar panel mounting systems, their corrosion-resistant zinc-plated variants provide decades of reliable outdoor equipment mounting performance.
Excavators, cranes, concrete pumps, and road construction machinery depend on Grade 10.9 serrated flange bolts for mounting hydraulic components, cab structures, and counterweight assemblies. Their high tensile strength and anti-loosening properties are critical in construction site environments subject to shock loads and ground vibration.
CNC machining centers, press brakes, injection molding machines, and conveyor systems utilize serrated flange bolts for base plate mounting, motor bracket assembly, and guard panel installation. The integrated washer function streamlines assembly in high-volume manufacturing equipment mounting operations.
Marine diesel engine mounting, deck equipment installation, and offshore platform structural connections require fasteners with exceptional corrosion resistance and vibration resistance. Hot-dip galvanized serrated flange bolts provide the ideal combination of mechanical performance and long-term durability in salt-spray environments.
Railway track equipment, signal gantry structures, and rolling stock component mounting increasingly specify serrated flange bolts to meet stringent vibration resistance standards. Their ability to maintain clamp force over millions of load cycles makes them a preferred choice for safety-critical transportation equipment mounting applications.
The global fastener market is evolving — here's how serrated flange bolts are positioned at the forefront of equipment mounting innovation.
The global industrial fastener market is projected to exceed USD 120 billion by 2028, driven by accelerating growth in renewable energy infrastructure, electric vehicle production, and smart manufacturing. Within this landscape, serrated flange bolts for equipment mounting represent one of the fastest-growing product segments.
China remains the world's largest producer and exporter of high-strength fasteners, with manufacturers like Ningbo Zhongli Bolts supplying to Europe, North America, the Middle East, Africa, and Southeast Asia. The shift toward ISO 9001-certified, traceable supply chains is reshaping procurement strategies for global OEMs and EPC contractors.
EV battery module mounting, motor housing assembly, and chassis structural connections increasingly specify serrated flange bolts for vibration isolation and assembly efficiency.
Utility-scale wind turbines and solar tracking systems require thousands of serrated flange bolts per installation, creating massive recurring demand from energy equipment mounting projects.
Robotic arm base mounting, collaborative robot safety frames, and automated conveyor equipment rely on serrated flange bolts for precise, maintenance-free fastening.
5G tower equipment mounting, antenna bracket installation, and data center server rack assembly create new high-volume applications for corrosion-resistant serrated flange bolts.
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, with registered capital of 1,500,000 RMB and total annual productivity of 8,000 tons per year. The company has set up several sales branches in different provinces in China.
The company's products are exported to Europe, USA, Middle East, Africa, Southeast Asia and other regions. With strong technical capability, complete testing equipment, and a variety of fully automatic multi-station cold and hot heading machines, Zhongli provides reliable and high-quality serrated flange bolts and equipment mounting fasteners to customers worldwide.
Through scientific management, Ningbo Zhongli Bolts Manufacturing Co., Ltd. obtained ISO9001 Certificate of Quality Management System. Our physical and mechanical test results reach ISO898-1 for bolts and ISO898-2 for nuts.
Read More About UsBeyond serrated flange bolts, Zhongli offers a comprehensive range of high-strength fasteners for all equipment mounting requirements.
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 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.
We hope to establish business relationships with partners all over the world, and our business can bring mutual benefits for both parties.
Every serrated flange bolt for equipment mounting undergoes a rigorous multi-stage manufacturing process to ensure dimensional accuracy and mechanical performance.
State-of-the-art manufacturing facility equipped with fully automatic multi-station cold and hot heading machines for serrated flange bolt production.
Five pillars of excellence that distinguish Zhongli as a leading serrated flange bolt supplier for equipment mounting applications worldwide.
A Professional Sales and Technical Team with More Than 20 Years History.
We Have Our Own Testing Equipment and Laboratory. 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 serrated flange bolt destined for equipment mounting applications undergoes comprehensive quality inspection to ensure dimensional accuracy, mechanical performance, and surface finish compliance. Our testing laboratory is equipped with advanced instruments to verify each product against DIN6921, ISO898-1, and customer-specific standards.
We hope to establish business relationships with partners all over the world, and our business can bring mutual benefits for both parties.
EN 15048 CE Certification, EN14399 CE Certification, ISO9001 Certificate — Quality you can trust for every equipment mounting application.
Grasp first-hand information — what our global equipment mounting clients say about Zhongli serrated flange bolts.
Contact Zhongli Bolts today for competitive pricing, free samples, and expert technical support for all your equipment mounting fastener requirements.
Explore our full range of high-strength bolts, studs, and fasteners for every equipment mounting requirement.
Heavy Hex Bolt Fine Coarse Thread UNC & UNF — Equipment Mounting Grade B
Hex Bolts DIN933 Grade 10.9 Black Color — Equipment Mounting B7 Hex Bolt
Heavy Hexagon-head Bolts ASTM A325 Zinc Plated — Equipment Mounting Structural Bolt
Carbon Steel Hex Bolt Fine Coarse Thread UNC & UNF — Equipment Mounting Hex Bolt
Fine Thread Hex Bolt DIN960 Black Grade 10.9 — High Strength Equipment Mounting Bolt
Stud Bolt ASTM A193 Grade B7 Thread Rod — M30 Equipment Mounting Stud
Hexagon Head Bolt Fine Coarse Thread UNC & UNF — Equipment Mounting GB Bolt
Threaded Metal Studs and Rods B7 — Black Double Head Equipment Mounting Bolt
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