The Simpson Strong-Drive SDWS TIMBER Screw is a structural wood screw engineered for cross-laminated timber construction, mass timber assemblies, log-home construction, and general interior wood-to-wood fastening applications. With a 0.195 in. shank diameter and 6 in. length, this black E-coat electrocoated fastener delivers reliable holding strength with less installation torque than comparable structural screws - making it a practical choice for demanding framing and timber panel work. Code listed under IAPMO-UES ER-192, it meets IRC and IBC requirements for a broad range of common wood framing applications.

Key Features

• SawTooth Point - ensures fast, clean starts in wood and reduces installation torque, eliminating the need for predrilling in most structural timber applications
• Serrated Thread Design - reduces material splitting and wood damage during installation, protecting the integrity of cross-laminated and mass timber assemblies
• Low Profile Washer Head (0.650 in. diameter) - large bearing area pulls mating members together firmly without requiring additional washers, speeding up installation
• T40 6-Lobe Drive - provides positive bit engagement that makes the screw easier to drive and extends driver bit life compared to standard drive types
• 3 in. Thread Length with 5 TPI Serrated Threads - optimized thread geometry delivers strong pull-through resistance in structural wood connections
• E-coat Electrocoating Finish - black electrocoated surface provides corrosion protection suitable for interior structural applications
• Code Listed - IAPMO-UES ER-192 - meets 2018 and 2021 IRC and IBC requirements for common wood framing applications, supporting inspections and permit approvals

Why This Product

• Requires less torque to install than comparable structural lag screws - reducing installer fatigue and speeding up production in high-volume timber framing or SIP panel projects
• The large-diameter washer head eliminates the need to use extra washers when pulling members together, cutting down on hardware costs and installation steps
• The SawTooth point enables direct driving without predrilling in most applications, making it especially efficient for log-home construction and mass timber work where drilling setup time adds up
• Code listed under IAPMO-UES ER-192 and compliant with IRC and IBC requirements - providing the documentation needed for permitted structural wood framing jobs

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter (in.): 0.195
• Length (in.): 6
• Head Diameter (in.): 0.650
• Head Type: Low Profile Head
• Drive Type: T40 6-Lobe
• Thread Type: Serrated Threads
• Thread Length (in.): 3
• TPI: 5
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black
• Country of Origin: Taiwan

Available Pack Options

• SDWS19600-R50: 50 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
• SDWS19600: 250 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)

Approved Applications

• Fastening Wood-to-Wood
• Log-Home Construction
• Structural Insulated Panels (SIPs)

Frequently Asked Questions

Does this screw require predrilling before installation?

The SawTooth point is specifically designed to ensure fast starts and reduce installation torque, eliminating the need for predrilling in most applications. This makes it well suited for cross-laminated timber, mass timber, and log-home construction where predrilling would slow down the workflow.

What drive bit is needed to install this screw?

This screw uses a T40 6-lobe drive. A T40 6-lobe driver bit is included with the product. If a replacement bit is needed, the compatible replacement bit is BIT40T-134-R2.

Is this screw suitable for outdoor or exposed applications?

This screw features an E-coat electrocoating finish and is designed for interior structural applications. It is not rated for exterior or high-moisture exposure environments - it is intended for cross-laminated timber construction, mass timber, and general interior wood-to-wood fastening.

What building codes does this screw meet?

The Strong-Drive SDWS TIMBER Screw is code listed under IAPMO-UES ER-192 and meets IRC and IBC code requirements for several common wood framing applications, including cross-laminated timber assemblies and Structural Insulated Panel (SIP) connections.