Bolt Hole Alignment: The Manufacturing Precision That Makes or Breaks Field Assembly
Quick Answer Bolt hole alignment is the single most critical quality parameter in angle steel tower fabrication. A self-supporting lattice tower is assembled from hundreds or even thousands of angles and connection plates using bolts—and any deviation in a single connection hole may render on-site erection impossible. The industry standard for hole position tolerance is ±0.5 mm per GB/T 2694, achieved through CNC-controlled punching and drilling systems that eliminate manual measurement errors. The final verification is trial assembly, where every bolt hole must pass a 100% bolt pass-through rate test—with reaming or forced driving strictly prohibited. When executed correctly, this precision ensures that thousands of bolt holes align perfectly on site, enabling rapid, frustration-free erection. Key Takeaways Hole-making precision is decisive: Bolted connections are the primary assembly method for lattice towers, making hole position accuracy the foundation of successful field erection ...