Half Round Head Square Neck Bolt

When it comes to reliable fastening solutions for wood-to-metal or wood-to-wood connections, the Semi-Circular Head Square Neck Bolt stands out as a time-tested component. Designed with a smooth rounded head that resists tampering and a square neck that bites into the material to prevent rotation during tightening, this bolt is widely used in construction, furniture assembly, and agricultural equipment. Our product range meets DIN 603 and ISO 8677 standards, ensuring consistent thread geometry, proper neck length, and reliable tensile strength. Available in multiple diameters and thread pitches, these bolts are ideal for applications where a flush or low-profile finish is needed without compromising on holding power.

Half Round Head Square Neck Bolt offers a practical balance of economy and performance. The low-profile head reduces the risk of snagging on clothing or passing objects, making it suitable for public seating, playground structures, and trailer decking. The square neck provides immediate anti-rotation grip once seated into a pre-punched square hole or timber, eliminating the need for a second wrench during assembly. We supply these bolts in carbon steel with self-color, zinc-plated, hot-dip galvanized, and stainless steel A2 or A4 finishes. Custom lengths and partial thread configurations are also available to match your specific clamping range requirements.

Key Product Features

• Conforms to DIN 603 / ISO 8677 specifications
• Square neck prevents rotation during installation
• Smooth half-round head for a clean, snag-free surface
• Available in diameter range M6 to M20
• Multiple material grades: 4.6, 4.8, 8.8, 10.9, A2-70, A4-70
• Surface finishes: plain, zinc-plated (clear/blue/yellow), hot-dip galvanized, stainless steel
• Thread types: full thread or partial thread as per standard
• Suitable for wood, composite, and pre-drilled metal joints

Standard Dimensions & Specifications

All Half Round Head Square Neck Bolt items are manufactured with precision rolled threads for superior fatigue resistance. The square neck is cold forged to maintain tight dimensional tolerances and sharp corners that lock securely into receiving holes. Whether you need a standard length for timber framing or a custom configuration for industrial equipment, our inventory supports both small batch and high volume orders. Each bolt is packaged with corresponding hex nuts and flat washers upon request, and full material certificates can be provided for traceability.