Premium Stainless Steel Carriage Bolts (DIN 603): The Ultimate Rust-Proof Fastener
At Handan Bolt, we define quality by durability. Our Stainless Steel Carriage Bolts (also known as Stainless Coach Bolts) are manufactured to withstand the harshest elements on earth. Produced in our Yongnian facility using premium grade 304 (A2) and 316 (A4) stainless steel wire, these fasteners offer the perfect combination of structural strength and lifetime corrosion resistance. They are the preferred choice for marine construction, luxury outdoor furniture, and architectural timber projects.
What is a Carriage Bolt?
A Carriage Bolt (Read more on Wikipedia) is a self-locking fastener distinguished by its smooth, domed head and a square section underneath.
The Design Logic:
- Safety & Aesthetics: The smooth, rounded head has no drive slot (like a Phillips or Hex). This not only looks sleek and modern but also provides a safety feature—there are no sharp edges to snag clothing or skin, making it ideal for playgrounds and public benches.
- Security: Since there is no way to unscrew the bolt from the head side, it acts as a security fastener. It can only be removed from the nut side, which is typically hidden or inaccessible.
The “Square Neck” Advantage
As clearly seen in your product photo, the square neck is the functional heart of this bolt. When installed into a pre-drilled hole in wood (or a square hole in metal):
The Square Neck bites into the material, locking the bolt in place. This prevents the bolt from spinning when you tighten the nut from the other side, allowing for easy, one-person installation.
Material Grades: Why Choose Stainless?
While we produce carbon steel bolts, the product shown here represents our premium stainless line:
1. Stainless Steel 304 (A2-70)
The industry standard for outdoor rust protection.
- Best For: Decking, fencing, pergolas, and general exterior construction where rain and humidity are present.
- Performance: Will not rust under normal atmospheric conditions.
2. Stainless Steel 316 (A4-80)
The “Marine Grade” option.
- Best For: Coastal areas (within 5 miles of the ocean), boat docks, swimming pool equipment, and chemical processing plants.
- Performance: Contains Molybdenum for superior resistance to salt water and chlorides.
Technical Specifications (DIN 603)
We manufacture strictly to the DIN 603 (Metric) and ANSI B18.5 (Imperial) standards.
- Head Style: Mushroom Head / Cup Head (Low profile).
- Thread Style: Full Thread (as shown in image) or Partial Thread depending on length.
- Polished Finish: All our stainless bolts undergo a passivation and polishing process to ensure a bright, mirror-like finish that enhances the look of your final product.
Common Applications
Our Stainless Carriage Bolts are widely used in sectors demanding both strength and beauty:
- Marine Construction: Securing planks on piers, docks, and boardwalks.
- Timber Framing: Joining heavy beams in exposed oak frame buildings.
- Automotive: Vintage car truck bed restorations (holding the wood bed strips).
- Water Treatment: Fastening equipment in humid, corrosive environments.
Why Source from Handan Bolt?
Material Authenticity: We use real spectrometer testing to guarantee the Nickel and Chrome content of our stainless steel. No fake “201” steel sold as “304”.
Stock Availability: We keep a large inventory of M6, M8, M10, and M12 stainless carriage bolts ready for fast export.
Packaging: Premium white boxes or blister packs available for retail hardware brands.
Get a Direct Factory Quote
Are you a fastener distributor or a timber construction company? Upgrade your supply with our premium stainless bolts.
Need a price list for 304 or 316 stainless bolts?
Please click here to Contact Our Sales Team for a Free Quote. We export to Europe and the USA!
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