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The Half-Thread Round Head Square Neck Carriage Bolt is a specialized fastener designed for secure, aesthetic connections in wood, metal, and plastic. Its unique structure—featuring a smooth Round Head, anti-rotation Square Neck, and Half-Thread shank—solves common installation pain points: the square neck locks into materials to prevent spinning, while the half-thread design balances shear strength and clamping force. Compliant with DIN 603, ANSI, and GB standards, it is widely used in construction (timber decks, porches), furniture assembly (ready-to-assemble cabinets), fencing (chain link barriers), outdoor equipment (swing sets), and light machinery. Crafted from high-strength carbon steel and finished with Blue-White Zinc Plated coating, it combines durability, anti-corrosion performance, and ease of use, making it a versatile choice for both industrial and residential projects.
| Model NO. | DIN603 |
| Connection | Common Bolt |
| Head Style | Round |
| Standard | DIN, ANSI, GB, JIS |
| Application | Machinery, Chemical Industry, Environmental, Building |
| Finish | Blue-White Zinc Plated |
| Certification | ISO, RoHS, CE |
| Delivery | Sea Freight, Air, Train, Express |
| Service | Support Customized Service |
| Samples | Free If It Is Available |
| Thread | Corase and Fine |
| Inspection | Optical Screening Instrument |
| Delivery Time | 30-45 Working Days |
| Transport Package | Plastic Bag, Boxes and Cartons, Pallets |
| Trademark | OEM, ODM, Donghuang |
| Origin | China |
| HS Code | 7318159090 |
Head & Neck Design: The top features a smooth, dome-shaped Round Head that sits flush with the material surface, eliminating sharp edges—ideal for furniture or visible construction. Directly below the head is a robust Square Neck: this critical component embeds into wood or metal, locking the bolt in place during tightening.
Shank & Thread: The shank is split into two parts: a smooth, unthreaded upper section (boosts shear strength) and a Half-Thread lower section (ensures tight clamping). Threads are available in Coarse Thread (for wood) and Fine Thread (for metal), with accuracy meeting metric standards for compatibility with standard nuts.
Surface Coating: The entire bolt is treated with Blue-White Zinc Plated finish, creating a bright, uniform layer that resists rust and oxidation. This coating not only extends service life in outdoor environments but also adds a professional look to assembled products.
The smooth, unthreaded shank portion is engineered to withstand high lateral forces, giving the Half-Thread Carriage Bolt 30% higher shear strength than full-thread bolts. This makes it perfect for load-bearing applications like deck framing, where the bolt must resist sideways pressure without bending.
The Square Neck eliminates the need for a second tool to hold the bolt: when inserted into a pre-drilled hole, the square neck embeds into the material (deeply in wood, securely in thin metal), preventing spinning as you tighten the nut. This cuts installation time by half, especially for large projects like fencing.
The Half-Thread design optimizes clamping: the unthreaded shank lets clamped materials (e.g., two wood planks) pull together without thread interference, creating a tighter bond that resists loosening over time. This is critical for outdoor furniture and machinery components exposed to vibration.
The Round Head design ensures no protruding parts, making it safe for areas where people may touch (e.g., swing sets, handrails). The Blue-White Zinc Plated finish avoids the dull look of uncoated bolts, enhancing the overall quality of visible projects like decks or furniture.
This Carriage Bolt works with wood (for decks, fences), metal (for machinery brackets), and plastic (for outdoor furniture). The Square Neck adapts to different material densities, providing reliable locking in both soft wood and hard metal.
Our Half-Thread Round Head Square Neck Carriage Bolt meets strict quality standards to ensure reliability:
Standard Compliance: All bolts are tested against DIN 603, ANSI, and GB standards. Dimensions (head thickness, shank length, thread pitch) are verified with three-coordinate measuring machines for precision.
Certifications: The product holds ISO and RoHS certifications, ensuring it meets global quality and environmental requirements. The Blue-White Zinc Plated coating is free of harmful substances like hexavalent chromium.
Advanced Inspection: Finished bolts are scanned with an Optical Screening Instrument to detect microscopic defects (thread burrs, neck deformation) that manual checks miss, ensuring 100% defect-free products.
Durability Testing: Each batch undergoes 96-hour salt spray testing (for corrosion resistance) and shear strength testing (to meet Grade 5/8 requirements). We also offer free samples for pre-production quality verification.
We offer Grade 5 (medium-carbon steel) for general use (furniture, fencing) and Grade 8 (alloy steel) for heavy-duty applications (automotive parts, machinery). Grade 8 bolts have a tensile strength of over 1500 MPa, suitable for high-stress environments.
Yes. The Blue-White Zinc Plated coating resists rain, humidity, and temperature changes, making it ideal for decks, fences, and outdoor furniture. For coastal areas with salt spray, we recommend our stainless steel version for enhanced anti-rust performance.
Yes—free samples are available for standard sizes (M6, M8, M10) if in stock. Contact our sales team with your requirements, and we’ll ship samples within 3–5 working days. Custom samples (non-standard sizes) require a small fee, which is deducted from your first bulk order.
