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New Simpson Strong-Tie THDSS designed for corrosion

Fastener is designed for corrosive environments and code listed for cracked concrete.

BY HBSDealer Staff

Simpson Strong-Tie has introduced the first 1/4″-diameter stainless-steel screw anchor designed for lighter-duty applications in severely corrosive environments. The screw is also code listed for use in cracked concrete.

Part of the broad line of code-listed stainless-steel Titen HD heavy-duty screw anchors (THDSS) from Simpson Strong-Tie, the new 1/4″ THDSS screw anchor combines the corrosion resistance of Type 316 stainless steel with the undercutting ability of harder, heat-treated carbon steel. The THDSS helical-coil threads feature a serrated carbon-steel leading thread that cuts a channel so the stainless-steel threading can securely interlock with concrete and masonry.

Traditional carbon-tipped stainless-steel anchors are vulnerable to rust and expansion that can crack the concrete, but the helical-coil carbon thread of the THDSS greatly reduces the anchor’s overall carbon-steel quantity, making it much less likely to cause concrete damage if corrosion occurs. For comparison, a 1/2″ x 5″ THDSS screw anchor contains less than 1% carbon steel, while other stainless-steel screw anchors of the same size can contain as much as 18% carbon steel.

The addition of the 1/4″-diameter anchor to the THDSS lineup (which also includes diameters of 3/8″, 1/2″, 5/8″ and 3/4″) rounds out the company’s offering of stainless-steel anchors suitable for bridge, marine, water-treatment plant, and heavier civil-construction and retrofit applications where corrosive elements pose a hazard to standard carbon-steel screw anchors. In addition to their strength and environmental adaptability, all Titen HD screw anchors install easily with an impact wrench or hand tool.

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