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Simpson Strong-Tie RCKW Kneewall Connector

Simpson Strong-Tie Company

Available Inventory: 3
  • $7.26
    Unit price per 

The Simpson Strong-Tie® RCKW is a heavy 171 mil (7 ga.) rigid connector that has been developed to resist overturning moment at the base of exterior kneewalls and parapets as well as interior partial-height walls or overhead ribbon window conditions. These connectors offer a unique small and large anchor-hole pattern that permits anchorage to both concrete and structural steel. Single 1/2" anchor or (2) 1/2" anchor options are available in all sizes for attaching to concrete. If load requires more capacity, a stiffener, the RCKWS can be added. The RCKWS is a heavy 171 mil (7 ga.) stiffener that nests onto the RCKW clip. 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 RCKW clip and RCKWS stiffener are sold separately.

Key Features

  • In addition to our RCKW3 and RCKW3S with a large single bolt hole for 3 5/8" framing, we have the RCKW3D and RCKW3DS, which have two large holes for anchorage. This provides an option for more capacity in 3 5/8"-framed kneewalls.
  • Anchorage legs incorporate stiffened flanges, improving overturning moment resistance.
  • Large-diameter anchor holes accommodate 1/2"-diameter concrete screw anchor and wedge anchors, such as the Simpson Strong-Tie Titen HD® heavy-duty screw anchor and the Strong-Bolt® 2 wedge anchor.
  • The RCKW5.5 and RCKW7.5 have three large holes for added versatility. The center hole is for a one-anchor solution at the edge or center of slab. The outer holes are for a two-anchor solution that requires higher capacities at the center of slab. In addition, two 3/8" Titen HD screw anchors have been tested in the outer holes for shallow embedment conditions like fluted deck. The RCKW3 and RCKW3S have single large holes in the center, and the RCKW3D and RCKW3DS have two large holes on the outside for increased anchorage capacity
  • Additional smaller-diameter anchor holes enable attachment to structural steel with #12 self-drilling screws.
  • Attachment to CMU can be achieved with Titen HD or Titen Turbo concrete and masonry screws.
  • For the RCKWS: 171 mil (7 ga.) stiffeners are secured to the RCKW clip with screws, optimizing overturning moment resistance and stiffness.


  • Galvanized (G90)


  • Use all specified screw fasteners. To achieve tabulated load values, use #12–14 screws according to the fastener patterns shown in the installation illustrations.
  • When using the RCKWS, secure the stiffener to the clip with the specified screw fasteners. Screws must be at least 1" long and extend through the connection with a minimum of three exposed threads.
  • Use all specified anchors. To achieve tabulated stiffness values, the installation torque for concrete anchors shall be at least 17 ft.-lb. or the torque requirements of the anchor, whichever is greater.
  • When using the larger-diameter anchor holes, the bottom track must be predrilled or punched with a 3/4"- diameter hole.

Patent Information

  • US Patent 9,938,709

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