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The difference between self-drilling mechanical anchors and expansion bolts

发布时间：2026-07-31

Author: Internet

Self‑drilling mechanical anchors (also known as self‑expanding mechanical anchors) and expansion bolts are both types of fasteners used to achieve anchorage in substrates such as concrete; however, they differ significantly in their operating principles, performance characteristics, application scenarios, and installation requirements.

Self-drilling mechanical anchor bolt ( Also known as a self‑expanding mechanical anchor bolt. ) Both expansion bolts and anchor bolts are fasteners used to achieve anchorage in substrates such as concrete, but they differ in… Operating principle, performance, application scenarios, and installation requirements There are significant differences in:

  1. Different operating principles:

Self-drilling mechanical anchor bolt It is a kind of Mechanical lock-key effect anchor bolt , Using the bottom of the anchor bolt Lock key effect ， When tightening the nut, the tapered screw rod pulls upward, forcing… Lock key At the bottom of the anchor bolt hole The expansion causes the annular blade at the base of the locking mechanism to cut into the concrete. ， Form a mechanical interlocking effect. 。

Expansion bolt It is a kind of Friction-type anchor bolt, Its operating principle is It relies on the expansion sleeve to deform and expand when the bolt is tightened. Generated Friction To resist tensile force.

  1. Different performance characteristics:

Self-drilling mechanical anchor bolt : Earthquake-resistant /Strong fatigue resistance, with high and stable load-bearing capacity. Expansion bolts: Primarily used for temporary fastening; they are prohibited for use in the reinforcement or installation of structural members.

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