China Wedge Anchor Fastener Supplier & Suppliers

Anchor slip is predominantly caused by undersized borehole depth, failure to thoroughly evacuate concrete drilling dust, or inadequate torque setting. When dust remains in the hole, the expansion collar slides along pulverized debris rather than biting into the solid concrete aggregate, reducing friction capacity by up to 50%.

No. Standard wedge anchors require solid, dense substrates (un-cracked or cracked C20/25 to C50/60 concrete) to generate expansion resistance. In hollow core, brick, or aerated masonry, the concentrated radial stresses will rupture the substrate walls. Sleeve anchors, drop-in anchors, or chemical anchors with perforated sleeves are required instead.

Galvanic corrosion occurs when aluminum and steel are in direct contact in the presence of an electrolyte. Handan Youlong provides integrated insulating EPDM washers and specialized non-conductive polymer shims. For direct contact applications, we apply Dacromet or Delta-Protekt inorganic flake coatings that act as a barrier layer.

As a general rule according to ETAG 001 guidelines, critical edge distance ($C_{cr,N}$) should be at least $1.5 \times h_{ef}$ (effective embedment depth), with center-to-center spacing ($S_{cr,N}$) maintaining a minimum of $3.0 \times h_{ef}$. Failure to follow these spacing guidelines causes overlapping cone stress fields, triggering premature edge spalling.