Product News

Simpson Strong-Tie Redesigns RCKW Kneewall Connector for Greater Concrete and Steel Anchoring Versatility

Simpson Strong-Tie, the leader in engineered structural connectors and building solutions, has redesigned its popular RCKW rigid kneewall connector to provide a versatile two-anchor option for structural steel contractors using 1/2” or 3/8” diameter anchors, resulting in faster and more efficient installation. When combined with the RCKWS stiffener (sold separately), the RCKW system can provide additional load capacity for optimizing overturning moment resistance.

Fabricated from heavy gauge, G90 galvanized steel, the RCKW and RCKWS have three large holes for a one-anchor solution at the edge or center of slab or a two-anchor solution for applications requiring higher capacities at the center of slab. The screw holes and anchor holes in the stiffener line up with those in the RCKW clip, making fastener and anchor installation a snap.

“The redesign to include a greater variety of anchoring options answers a contractor need for greater versatility in structural steel connectors that are adaptable and easy to use,” said Simpson Strong-Tie senior product manager Clifton Melcher, P.E. “Multiple install options and load solutions help simplify installations while providing required rotation resistance so buildings can meet unique load requirements.”

In addition, Simpson Strong-Tie has successfully tested the two (2) anchor solution with 3/8” anchors, providing a big benefit for shallower embedment requirements like fluted decks. Features of the RCKW system include:

  • Unique small and large anchor-hole patterns permit anchorage to both concrete and structural steel.
  • Stiffened anchorage leg flanges provide improved overturning moment resistance.
  • Large anchor holes to accommodate 1/2″-diameter Simpson Strong-Tie Titen HD heavy-duty screw anchors and the Strong-Bolt 2 wedge anchor.
  • Additional smaller-diameter anchor holes enable attachment to structural steel with #12 self-drilling screws.
  • RCKWS stiffeners can be secured to the RCKW clip with screws, optimizing overturning moment resistance and stiffness.

For more information on the RCKW system, including fastener pattern options, install diagrams, a stiffness calculator, and allowable load tables for both concrete and steel applications, visit

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