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Product descriptions：
Pre-insert style multilevel expansion anchor bolt of A-series:when screwing down outer hexagonal nut,expansion nut of anchor bolt press each expansion slice thereby expands effectively between screws and bore wall that makes bi-lateral force to the constrained loads.
Product advantages：
◆Innovative designs with multilevel expansion structure,which makes distribution area of load stress to be enhanced by over 30 times.With 8.8-grade screw:800Mpa/30≤C30 concrete strength.Now,concrete structure is safe.
◆ Small edge distance：Load strain distributes an average,load strain value≤C30 concrete strength value,effectly avoids the concrete produces big cones becoming invalid when expansion nut of anchor bolt swelling.
◆ Excellent moving load function：original created Multi-level swelling structure makes two-way force of constraint,so it is safer to bear moving load.
◆ Improved Safety function：load strain Scatter homogeneously,thereby increases the anchor bolt base security ,and the maximal load ability of the anchor bolt can be brought to maximum level.
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