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DIN 603 Stainless Steel Carriage Bolts, also known as Coach Bolts or Mushroom Head Square Neck Bolts, are widely used fastening components designed for secure and anti-rotation installation in wood, metal, construction, furniture, agricultural equipment, and industrial assemblies. Featuring a smooth domed mushroom head and square neck beneath the head, these bolts provide a clean appearance while preventing spinning during tightening.
Manufactured according to DIN 603 standards, these carriage bolts are available in high-quality stainless steel grades such as A2 (304) and A4 (316), offering excellent corrosion resistance, high durability, and long service life in indoor, outdoor, and marine environments.
The square neck locks into pre-drilled square or wooden holes, allowing the nut to be tightened from one side without requiring a tool on the bolt head. This makes DIN 603 carriage bolts ideal for timber structures, fencing systems, decking, machinery, playground equipment, and stainless steel assemblies.
| Materialqualität | Beschreibung | Bewerbung |
|---|---|---|
| Stainless Steel A2 / 304 | Standard corrosion-resistant stainless steel | General outdoor & industrial use |
| Stainless Steel A4 / 316 | Marine-grade stainless steel | Chemische Küstenumgebungen & |
| Kohlenstoffstahl | Wirtschaftliche Option mit hoher Festigkeit | Indoor & heavy-duty fastening |
| Zinc Plated Steel | Corrosion-protected carbon steel | Allgemeine industrielle Anwendungen |
| Fertig | Eigenschaften |
|---|---|
| Einfach Edelstahl | Natürliche Korrosionsbeständigkeit |
| Poliert | Decorative and clean appearance |
| verzinkt | Basic rust protection |
| feuerverzinkt | Robuster Outdoor-Schutz |
| schwarz oxidiert | Industrielles dunkles Finish |
DIN 603 carriage bolts consist of:
| Teil | Funktion |
|---|---|
| Mushroom Head | Smooth rounded surface for safety and appearance |
| Quadratischer Hals | Prevents rotation during tightening |
| Gewindeschaft | Secures fastening with nut |
| Nut & Washer (Optional) | Provides locking and load distribution |
| Standard | DIN 603 |
|---|---|
| Produkttyp | Carriage Bolt / Coach Bolt |
| Kopftyp | Mushroom Dome Head |
| Halstyp | Quadratischer Hals |
| Gewindetyp | Metrisch Grobgewinde |
| Material | Edelstahl 304 / 316 |
| Gewinderichtung | Rechtsgewinde |
| Größenbereich | M5 – M20 |
| Längenbereich | 16mm – 300mm |
| Bewerbung | Wood, Construction, Machinery, Furniture |
| Durchmesser | Gemeinsame Längen |
|---|---|
| M5 | 16mm – 60mm |
| M6 | 20mm – 100mm |
| M8 | 25mm – 150mm |
| M10 | 30mm – 200mm |
| M12 | 40mm – 250mm |
| M16 | 50mm – 300mm |
| M20 | 60mm – 300mm |
The square neck locks firmly into wood or square holes, preventing unwanted spinning during tightening.
The rounded mushroom head reduces snagging and injury risks compared to hex head bolts.
Stainless steel construction ensures long-lasting performance in humid, outdoor, and marine conditions.
Ideal for visible installations where aesthetics matter, such as furniture, fences, playgrounds, and architectural structures.
Can be installed using only one-side tool access.
| Gewindegröße | Pitch (P) | Head Diameter (dk) | Square Neck (s) |
|---|---|---|---|
| M5 | 0.8 | 13.55mm | 5mm |
| M6 | 1.0 | 16.55mm | 6mm |
| M8 | 1.25 | 20.65mm | 8mm |
| M10 | 1.5 | 24.65mm | 10mm |
| M12 | 1.75 | 30.65mm | 12mm |
| M16 | 2.0 | 38.8mm | 16mm |
| M20 | 2.5 | 46.8mm | 20mm |
Stainless steel carriage bolts offer superior durability compared to ordinary carbon steel fasteners. They maintain structural integrity and appearance even after long-term exposure to moisture, rain, chemicals, and outdoor environments.
A2 stainless steel is suitable for most industrial and construction projects, while A4 stainless steel is recommended for marine, coastal, and chemical applications requiring enhanced corrosion resistance.
| Verpackungsart | Beschreibung |
|---|---|
| Kleine Kartonverpackung | Retail & hardware distribution |
| Großkartonverpackung | Industrieller Großhandel |
| Palettenverpackung | Exportversand |
| Customized Packaging | OEM branding available |
A carriage bolt has a smooth mushroom head and square neck designed to prevent rotation, while a hex bolt uses a hexagonal head tightened with a wrench.
The square neck locks into wood or square holes to stop the bolt from spinning during tightening.
Yes. Stainless steel A2 and A4 carriage bolts provide excellent corrosion resistance for outdoor and humid environments.
A2 (304) stainless steel is suitable for general applications, while A4 (316) offers superior resistance against saltwater and chemicals.
Yes. They are commonly used in wood-to-metal and metal-to-metal fastening applications when paired with washers and nuts.
Yes. Customized diameters, lengths, materials, finishes, and packaging can be supplied according to project requirements.
Construction, furniture manufacturing, agriculture, machinery, transportation, fencing, and renewable energy industries widely use DIN 603 carriage bolts.
Yes. OEM laser marking, custom labels, private packaging, and export carton solutions are available for bulk orders.
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