316 - Stainless Steel - Serrated - Hexagon flange bolt
For applications where failure is not an option due to harsh environmental conditions, our Grade 316 (A4) serrated hexagon flange bolts are the ultimate solution. Containing molybdenum for superior resistance to chlorides and acids, these fasteners prevent pitting and rust in marine and chemical settings. The integrated serrated flange adds a mechanical locking layer, ensuring that critical connections remain secure even under constant vibration or thermal cycling.
- Marine Grade A4: Manufactured from high-quality 316 stainless steel, offering the highest level of corrosion resistance among standard fasteners.
- Vibration Proof: The serrated bearing face under the head bites into the surface, preventing back-out caused by engine vibration or wind loads.
- Premium Supply: We maintain a robust stock of A4-70 and A4-80 grade bolts, ready for immediate dispatch to shipyards, processing plants, and construction sites.
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Technical Superiority of Grade 316 (A4)
Grade 316 is often referred to as "acid-proof" or "marine-grade" steel. While it looks identical to Grade 304, its internal chemistry is different. The addition of Molybdenum gives it a specific resistance to chloride corrosion (salt), making it the mandatory choice for coastal projects. When combined with a serrated flange, it offers a dual benefit: chemical durability and mechanical security.Material Specifications and Grades
Our 316 serrated flange bolts are typically supplied in accordance with ISO 3506 standards:| Feature | Specification | Benefit |
|---|---|---|
| Designation | A4 (Austenitic Group 4) | The highest corrosion resistance class for standard metric fasteners. |
| Key Element | Molybdenum (2-3%) | Prevents "pitting" corrosion commonly caused by salt spray and chlorides. |
| Strength Class | A4-70 (Standard) | Tensile Strength: 700 N/mm². Provides structural reliability similar to high-tensile carbon steel. |
Quality Assurance
Material verification is critical when paying for premium alloys. An EN 10204 3.1 Material Certificate confirming the Molybdenum content is available upon request. Please note that third-party inspection services require an additional fee.Critical Applications for SS316
These bolts are designed for environments that would rapidly destroy standard steel or Grade 304 fasteners:- Marine Industry: Deck fittings, engine mounts, and hull components on boats and ships.
- Chemical Processing: Flange connections in pipelines carrying aggressive fluids or gases.
- Coastal Construction: Outdoor structures, balustrades, and solar arrays located within 5km of the ocean.
- Medical & Pharmaceutical: Equipment requiring sterile, non-reactive, and cleanable surfaces.