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These screws meet the requirement of the tile roofing institue as described in ESR-2015P
the LSC simplifies stair construction while delivering dependable structural performance
Engineered for speed and grip in metal-to-metal connections
Racking systems and equipment anchoring
Its gripping section holds the bolt without a nut
Simpson CD25212M 1/4" X 2-1/2" Mushroom Head Crimp Anchor - Zinc, Pkg 100 Hex Head 410 Stainless Steel Concrete Screws These screws meet the requirementThe Simpson Strong Tie Crimp Drive anchor is an easy to install expansion anchor for use in concrete and grout filled block. The pre formed curvature along the shaft creates an expansion mechanism that secures the anchor in place and eliminates the need for a secondary tightening procedure. This speeds up anchor installation and reduces the overall cost. The low profile mushroom head works excellent for attaching wood or light gauge steel to concrete
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