Applicable for：
Back-hung curtain wall system
Range of use：
Natural stone；Artificial stone；Ceramic plate；Artificial fiber plate
Description of the product：
1. Pre-insert post-undercutting stress-free aseismatic anchor bolt，has passed the seismic test of 9 degree fortification in National Center for Quality Supervision and Test of Building Engineering.
2. Use diamond hole expanding drill to drill and expand hole at a time.
3. Mechanical properties of anchor bolt screw, including SS A2-70, A4-70,are available.
Advantages of the product：
1. Anchor bolt dilatant is a sequential structural plane .When the dilatant is expanding ，the lower diameter expands but the upper diameter minishes .At the moment，the shape of anchor bolt dilatant is changed from cylindrical surface to circular surface ，while its surface area remains the same.
2. The radius of dilatant conical surface equals to the radius of the stone bottom cutting hole conical surface ，and the two curved surfaces form unstressing concentric curved surface engagement.
3. Due to that the dilatant and drilled stone hole are conical meshing (the similar products nearly are points meshing), meshing area increases while meshing pressure depresses, that it could effectively protect the stone from high pressure.
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