High-Quality Carriage Bolt Manufacturer
Core Structure and Design Advantages
1. Structural Features
Head: Smooth hemispherical (some sizes are flattened round), without grooves or sharp edges, resulting in a smooth surface after installation, preventing snagging on clothing or cables, and reducing damage from external impacts.
Neck: A square neck is located below the head, which is the core anti-rotation structure of the carriage bolt. Its side length matches the bolt diameter (e.g., the square neck of an M8 bolt is approximately 8mm). During assembly, the square neck embeds into the pre-drilled square hole or groove in the connected parts, preventing the bolt from rotating synchronously with the nut when tightened.
Shaft: Full or partial thread design (standard is full thread), thread precision conforms to GB/T 196 standard, ensuring a tight fit with the nut. Shaft diameters range from M5 to M24 to accommodate different force requirements.
2. Core Advantages
**Convenient Single-Sided Installation:** No need to operate from both sides of the connected parts; tightening can be completed by simply using a wrench on one side, suitable for applications involving wood, boards, etc., where force cannot be applied from both sides.
**Reliable Anti-Rotation Performance:** The square neck mechanically engages with the square hole of the connected part, preventing the bolt from rotating during tightening, avoiding thread stripping or loosening, especially suitable for vibration environments.
**Friendly Surface:** The smooth, rounded head design does not damage the contact surface and enhances the aesthetics after assembly, suitable for exposed installation scenarios.
