MiTek Z4 Tie Down System

MiTek Z4 Tie-Down Systems utilize CNX-Series Cinch Nuts to compensate for wood shrinkage and building settlement that cause connections to loosen over time. The Cinch Nut uses a self-ratcheting action that permits the cinch nut to move (the rod doesn’t move) or “travel” perpetually in one direction only down the rod. Available for installation with threaded rods that are 3/8 inch through 1-1/2 inch diameter in 1/8 inch increments, the CNX Cinch Nut has been code evaluated and published in ESR-2190.

• Place the specified Bearing Plate Washer onto the bottom plate of a wood framed wall.
• With the “wings” oriented downward, place Cinch Nut over the threaded rod extending from below and push down until it seats firmly on the Bearing Plate Washer.
• Install 1/4 inch diameter USP WS-Series screws through the wings, penetrating 1 -1/2 inches (minimum) into the wood bottom plate.
• Model numbers BPW5 and BPW6 fit in-between the screws fastening the wings.
• Model numbers BPW7 (3-1/4 x 4-3/8) and larger are provided with two screw holes. Align the wing and the Bearing Plate Washer screw holes to allow installation of 1/4 inch diameter WS-Series screws.

For resisting roof uplift loads resulting from wind the Z4 Cinch Nut is installed over a Bearing Plate Washer above the top plates with roof framing above to create a tie-down system. Uplift forces are transferred into a continuous system of All Thread Rods / ATRs and Couplers that form a load path to the foundation.

Accurate Placement and Installation

Step 1: Use the two 3/16″ holes provided to nail CT or T2 at desired location on wood member

Step 2: use the CT or T2 as a template to accurately drill holes for bolting

Step 3: Make bolted connections to the wood member per plans and specifications

Step 4: Make threaded rod connection per plans and specifications.

Accurate Placement and Installation

Step 1: Use the two 3/16″ holes provided to nail CT or T2 at desired location on wood member.

Step 2: Use the CT or T2 as a template to accurately drill holes for bolting.

Step 3: Make bolted connection to the wood member per plans and specifications.

Step 4: Make threaded rod connection per plans and specifications.

To resist tension loads due to overturning moments in multi-story buildings the CNX Cinch Nut is installed over a Bearing Plate Washer at each level in a fast and easy application. At the upper-most level a Cinch Nut is installed over a Bearing Plate Washer above the top plates. At walls below that bear on wood floor systems, the Cinch Nut and Bearing Plate Washer are installed over the bottom plate. Tension loads are gathered at each level and transferred into the foundation through a continuous system of Cinch Nuts, Bearing Plate Washers, All Thread Rods/ATRs and Couplers all available from MiTek® Builder Products.