The nominal wall thickness of a 25mm hollow anchor bolt is typically 5mm (often marked as Φ25×5), which is the most common configuration in railway and national standard engineering projects.
The national standard GB 50086-2015 requires that the wall thickness of hollow grouting anchor bolts should not be less than 5.0mm. This means that 5.0mm is the minimum requirement, and the actual product wall thickness can be higher.

Time：01/07/2026 16:28:34

Answers

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