The Simpson Strong-Drive SDWC TRUSS Structural Screw (Model SDWC15450B-KT) is a high-strength structural wood screw engineered specifically for fastening trusses and rafters to wall top plates - delivering a time-saving, reliable alternative to traditional fastening methods. Measuring 0.155 in. in shank diameter x 4-1/2 in. in length, this screw features a fully-threaded shank that engages the entire length of the fastener, creating a secure, engineered connection between roof and wall framing members. Its shorter thread length is purposefully designed for multi-ply applications including plated trusses, engineered-lumber products, and solid-sawn lumber. Finished in a durable black E-coat electrocoating and driven with a T-30 6-Lobe drive, each kit includes 500 screws, two matched-tolerance driver bits, and two metal installation guide tools for precision installation every time.

Key Features

• Cap-style head countersinks fully into the double top plate to avoid interference with drywall or finish trades
• Wide installation angle tolerance makes it easy to install the SDWC correctly, reducing installer error
• Interior installation capability - can be installed from inside the structure, eliminating exterior work on upper stories and enhancing job safety
• Flexible fastening sequence - fastening can be performed before or after exterior sheathing is applied for added flexibility
• Type-17 point for faster starts and easier driving without pre-drilling
• Fully-threaded shank engages the entire length of the fastener for a secure connection between roof and wall framing members
• Matched-tolerance driver bit (included) engages fastener head securely to allow one-handed driving (replacement bit part no. BIT30T-2-R2)
• E-coat electrocoating black finish for corrosion resistance and a clean, professional appearance
• Metal installation guide tool included to help ensure proper installation

Specifications

• Model No.: SDWC15450B-KT
• Shank Diameter: 0.155 in.
• Length: 4-1/2 in.
• Thread Length: 4-1/4 in.
• Head Type: Cap Head
• Head Diameter: 0.335 in.
• Drive Type: T-30 6-Lobe
• Point Type: Type-17 Point
• Coating / Finish: E-coat Electrocoating
• Color: Black
• Packaging Quantity: 500
• Country of Origin: Taiwan

Approved Applications

• Fastening Truss/Rafter-to-Plate
• Multi-ply plated truss connections
• Engineered-lumber product fastening
• Solid-sawn lumber connections

What's Included

• (500) Strong-Drive SDWC screws
• (2) Matched-tolerance

Frequently Asked Questions

What is included in the SDWC15450B-KT kit?

Each kit includes 500 Strong-Drive SDWC screws (0.155 in. x 4-1/2 in.), two matched-tolerance T-30 6-Lobe driver bits (part no. BIT30T-2-R2, also sold separately), and two metal installation guide tools (SDWC-GUIDE, also sold separately) to help ensure proper installation.

What applications is the SDWC TRUSS screw designed for?

This screw is engineered specifically for fastening trusses and rafters to wall top plates. Its shorter thread length makes it well suited for multi-ply applications including plated trusses, engineered-lumber products, and solid-sawn lumber.

Can these screws be installed from inside the structure, and does the installation sequence matter?

Yes. The SDWC TRUSS screw is designed to be installed from inside the structure, which eliminates the need for exterior work on upper stories and enhances job safety. Installation can also be performed either before or after exterior sheathing is applied, providing added flexibility in the construction sequence.

What drive type and head style does the SDWC15450B-KT use, and how does the head affect surrounding finish work?

The screw uses a T-30 6-Lobe drive with a cap-style head. The cap head countersinks fully into the double top plate, avoiding interference with drywall or other finish trades. The included matched-tolerance driver bits engage the fastener head securely to allow one-handed driving.