Your Professional Bolt Nut Supplier
Sunlion Piping Engineering Co., Ltd. is a global supplier of piping systems and structural steel modules for energy, petrochemical, offshore, nuclear, and heavy industrial projects. With over 20 years of international project experience, Sunlion delivers vertically integrated solutions from raw materials to finished modules. The company serves leading EPC contractors and end users worldwide, providing compliant products, modular fabrication, inspection coordination, and OEM/ODM customization to support efficient and reliable project execution.
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![High Strength Bolts and Nuts]()
High Strength Bolts and NutsOur product range includes High Strength Bolts and Nuts, washers, and complete fastening systems, widely used in steel structures, bridges, power towers, wind turbines, oil & gas, rail transit,
why choose us
Quality Control
All products are manufactured to recognized standards such as ASME, DIN, GB, and JIS and undergo coordinated inspection and testing by third-party organizations such as SGS to ensure traceability and consistent quality.
Customization Services
We offer OEM and ODM services, tailored to project requirements, including material grades, dimensional tolerances, marking systems, packaging methods, and documentation, to meet both standardized and project-specific engineering needs.
Integrated Supply Chain
We manage the entire supply chain, from steel pipe sourcing to prefabricated piping and structural modules. This integrated model simplifies procurement coordination, improves schedule control efficiency, and minimizes interface risks between multiple suppliers in complex projects.
Sales Markets
With over two decades of experience executing international projects, we have delivered materials and modules to projects in the Middle East, Australia, the Americas, Africa, and Europe, supporting EPC general contractors under various technical standards and logistical conditions.
Specification
|
Specification Item |
Details |
|
Product Name |
Bolts and Nuts |
|
Material |
Carbon steel, alloy steel, stainless steel |
|
Bolt Grades |
8.8, 10.9, 12.9 |
|
Nut Grades |
Matched to bolt grades (e.g., 8, 10) |
|
Size Range |
Metric sizes M6 – M64 |
|
Thread Type |
Metric coarse and fine threads |
|
Standards |
ASME, ASTM, DIN, ISO, GB |
|
Surface Finish |
Plain, black oxide, zinc plated, hot-dip galvanized |
|
Typical Use |
Structural joints, machinery, industrial connections |
The Benefits of Bolt Nut
Durability
Bolt nuts last longer and are less likely to degrade or fail over time.
Strength
They can handle higher loads and stresses, making them suitable for critical construction applications.
Corrosion Resistance
Bolt nuts are treated or made from materials that resist rust and corrosion.
Precision
High-quality bolts and nuts fit perfectly, ensuring tight and secure connections.
Types of Bolt Nut
|
Fastener Type |
Characteristics |
Best Uses |
|
Hex Bolts |
Hexagonal head, easily tightened with a wrench, available in different sizes and thread lengths. |
Construction, machinery, furniture, plumbing, electrical systems. |
|
Lag Bolts |
Heavy-duty, threaded directly into material, no nut required, high holding power. |
Securing wood to other materials, decks, fences, and heavy wooden structures. |
|
Carriage Bolts |
Large, smooth head with a square neck to prevent rotation, used with nuts. |
Fencing, decking, gates, furniture assembly, boat building. |
|
Machine Screws |
Smaller bolts, available in coarse and fine threads, used in precision applications. |
Automotive, manufacturing, electronics, HVAC, furniture assembly. |
|
Socket Cap Screws |
Low-profile head, hex socket for easy tightening in tight spaces. |
Automotive, machinery, manufacturing, construction, electronics. |
|
Hex Nuts |
Hexagonal shape, standard fastener, widely used in construction and machinery. |
Joining steel beams, securing engine components, furniture assembly. |
|
Jam Nuts |
Low-profile, used as a secondary nut to prevent loosening, vibration-resistant. |
Machinery, piping, vehicle steering and suspension components. |
|
Cap Nuts |
Dome-shaped head, covers exposed bolt threads, improves appearance and protection. |
Furniture assembly, light fixtures, decorative and outdoor applications. |
|
Flange Nuts |
Built-in washer-like flange, distributes pressure, vibration-resistant. |
Automotive, machinery, aerospace, medical devices, furniture. |
|
Coupling Nuts |
Long, cylindrical, used to connect two threaded rods, hexagonal exterior for wrench tightening. |
Structural applications, airframes, machinery, industrial assemblies. |
|
Wing Nuts |
Two wing-like projections, allows hand-tightening without tools. |
Bicycles, musical instruments, electronics, furniture, laboratory equipment. |
|
Lock Nuts |
Designed to resist loosening from vibration, uses mechanical or chemical locking methods. |
Vehicles, aircraft, machinery, agricultural equipment, buildings, bridges, electronics. |
Common Materials for Bolt Nut
Carbon Steel
Carbon steel is popular because it's affordable and offers decent mechanical properties. It's commonly used for low to medium-stress applications.
Stainless Steel
Made from iron, carbon, and chromium, stainless steel is known for its excellent resistance to corrosion. It comes in different grades like 304, 316, and 410, offering varying levels of strength and corrosion resistance.
Alloy Steel
Alloy steel is strengthened with elements like chromium, molybdenum, or nickel to boost its performance in high-stress situations.
Brass
Brass, an alloy of copper and zinc, is known for its corrosion resistance and attractive look.
Titanium
Titanium is prized for its exceptional strength-to-weight ratio, corrosion resistance, and biocompatibility.
Aluminum
Lightweight and corrosion-resistant, aluminum is often alloyed with other elements to improve its strength.
Bolt Nut Finish Options
Plain (Uncoated) Finish
Unfinished steel without any additional coating.
Indoor applications where corrosion is not a concern.
Zinc Plating
A thin zinc coating applied to steel bolts to improve their corrosion resistance.
General-purpose use in dry environments or mild outdoor exposure.
Hot-Dip Galvanized (HDG)
A thick zinc coating applied through a hot-dipping process, offering superior corrosion resistance.
Outdoor structures, bridges, fences, and marine applications.
Highly durable and resistant to rain, snow, and saltwater.
Black Oxide
A chemically-applied finish that enhances corrosion resistance and reduces glare.
Automotive, firearms, and industrial applications where appearance matters.
Provides a sleek, black finish and mild corrosion protection when combined with oil.
Nickel Plating
A shiny, silver finish that provides moderate corrosion resistance and a visually appealing look.
Decorative types of bolts and nuts, electrical components, and light-duty applications.
Smooth, attractive appearance with improved wear resistance.
Chrome Plating
A polished, shiny finish applied over a layer of nickel.
Motorcycles, classic cars, furniture, and decorative hardware.
Rust-resistant, highly reflective, and provides a luxurious look.
Stainless Steel (Natural Finish)
Stainless steel nuts and bolts naturally resist rust without the need for extra coatings.
Marine environments, food processing, medical applications, and outdoor projects.
Long-lasting, corrosion-resistant, and requires minimal maintenance.
Phosphate Coating
A chemical treatment that gives a matte gray or black finish while increasing resistance to wear and corrosion.
Military, automotive, and industrial applications.
Provides good lubrication when used with oil, reducing friction and wear.
Applications of Bolt Nut
Construction
In construction, bolts and nuts are widely used to join steel beams, columns, and structural frames. High-strength bolts (like Grade 8 or Class 10.9) are often specified for load-bearing joints.
Nuts provide the essential locking function, especially in bolted connections that require long-term integrity. Weather-resistant materials and coatings are commonly used in outdoor or exposed environments.
Machinery
Machinery assemblies demand fasteners that can withstand high stress, repetitive motion, and vibration. Bolts provide the core structural connection between components like motors, housings, and frames.
Lock nuts or washers are often added to prevent loosening during operation. Maintenance-friendly designs frequently use nuts and bolts that allow for easy disassembly and part replacement.
Electronics
In electronic applications, fasteners are typically smaller and lighter, often made of nylon, brass, or stainless steel. Nuts and bolts are used to secure circuit boards, enclosures, and mounting brackets without causing electrical interference.
Customization Services
We offer customized bolt nut manufacturing solutions to meet your needs. Key customization options include:
|
Material |
Customizable |
|
Grades |
Customizable |
|
Sizes |
Customizable |
|
Threads |
Customizable |
|
Surface Finish |
Customizable |
|
Our customization capabilities extend beyond the options listed above. Should you have additional requirements, we are able to make flexible adjustments in accordance with your specific needs and circumstances. |
|
Packaging and Shipping
|
Packaging |
Cartons, pallets, or wooden cases depending on size |
|
Transportation methods |
Road transport, rail transport, sea transport |
FAQ
As one of the most professional bolt nut manufacturers and suppliers in China, we offer a wide range of products with superior quality. Please rest assured to wholesale high-grade bolt nut at competitive price from our factory. Contact us for more details.
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