Q: What is the difference between a Bolt and a Stud Bolt?
A: The choice depends on your specific application:
Hex Bolts: Feature a hexagonal head on one end and threads on the other. They are the most common type, used for fastening two parts together with a nut.
Stud Bolts: Have threads on both ends and no head. They are typically used in pairs with two nuts and are ideal for high-pressure flange connections, such as in oil and gas pipelines, valves, and petrochemical equipment.
Q: How do I choose the right strength grade for my project?
A: The strength grade indicates the bolt's load-bearing capacity. Common metric grades include:
Grade 4.8: Low to medium strength, suitable for general woodworking, light machinery, and non-critical structural applications.
Grade 8.8: High-strength carbon steel bolts, widely used in automotive, construction, and general structural steel connections.
Grade 10.9 & 12.9: Ultra-high-strength alloy steel bolts, designed for heavy machinery, high-stress structural steel, and extreme load-bearing environments.
Q: What materials and surface treatments do you offer to prevent corrosion?
A: We supply bolts in Carbon Steel, Stainless Steel (304/316), and Alloy Steel. To protect against rust and harsh environments, we provide multiple surface finishes:
Hot-Dip Galvanized (HDG): Thick zinc coating for outdoor and marine environments.
Zinc Plated (Electro-galvanized): Smooth, bright finish for indoor use.
Black Oxide / Phosphating: Often used for structural steel bolts (like ASTM A325/A490) to maintain torque-tension properties.
Q: Can you manufacture non-standard or custom bolts based on our drawings?
A: Absolutely. As a direct manufacturer, we fully support OEM/ODM services. We can produce custom bolts based on your CAD drawings, samples, or specific project requirements, including special head types, unusual lengths, and custom threading.
Q: How do you package the bolts to prevent damage and loss during ocean freight?
A: We use robust, seaworthy packaging. Standard options include carton boxes + wooden pallets or tin containers + wooden pallets. For smaller quantities, we can provide plastic bags, shrink wrap, or custom-printed boxes. All packaging is designed to prevent moisture damage and physical impact during long-distance sea transport.
