The Simpson Strong-Tie Strong-Drive SDHR Combo-Head Screw is made for serious wood projects like cross-laminated timber (CLT), mass timber, and other big framing jobs.
The unique combo-head design gives you flexibility, with a choice to drive it with either a hex bit or a T40 6-lobe bit. A knurled shank helps lock the screw in place, and the sharp Type-17 point starts fast, reduces driving torque, and often eliminates the need for predrilling. Finished with a blue zinc coating, these screws are perfect for tough interior jobs where strength and reliability matter most.
Key Features
- Made for Big Projects – Ideal for CLT, mass timber, and other engineered wood connections.
- Dual Drive Options – Drive with either a hex bit or T40 6-lobe bit, whichever works best for you and your project.
- Strong Hold – Partially threaded shank with knurl pulls members together and resists pull-out.
- Secure Drive – Deep T40 6-lobe recess for consistent engagement (replacement bit: BIT40T-134-R2).
- Interior Ready – Blue zinc coating offers corrosion resistance for dry, indoor applications.
