The Simpson Strong-Drive SDWS Timber Screw - 0.220" shank diameter x 10" length with Double-Barrier Coating in tan - is a heavy-duty structural fastener engineered to deliver a high-strength, easy-to-install alternative to traditional lag screws and through-bolting in wood framing applications. Designed for both professional contractors and do-it-yourselfers, this timber screw meets IRC and IBC code requirements for most common wood framing tasks and carries a code listing in IAPMO UES ER-192. Whether you are tackling wood-to-wood fastening, crating, or other structural connections, this screw combines fast installation with reliable holding power in a corrosion-resistant package suitable for certain exterior and preservative-treated wood applications.

Key Features

• SawTooth Point - starts fast and reduces installation torque, eliminating the need for predrilling in most applications so you can work faster with fewer steps on the job site.
• T40 6-Lobe Drive - provides positive bit engagement that reduces cam-out, makes the screw easier to drive, and extends driver bit life compared to conventional drive styles.
• Washer Head with 0.760" head diameter - delivers a large bearing area that distributes load effectively across the wood surface, reducing the risk of pull-through in structural connections.
• Double-Barrier Coating - provides corrosion resistance equivalent to hot-dip galvanization, making this screw suitable for certain exterior environments and preservative-treated lumber as described in the evaluation report.
• Bold thread design with 5 TPI and 3" thread length - maximizes holding power and pull-out resistance in timber and heavy framing applications.
• Code listed in IAPMO UES ER-192 - meets 2018 and 2021 IRC and IBC requirements for most common wood framing applications, giving inspectors and contractors confidence in the connection.
• Tan color finish - blends with treated lumber for a cleaner, professional appearance on exterior and structural installations.

Why This Product

• Replaces lag screws and through-bolting without sacrificing strength - the SDWS Timber Screw is engineered as a direct high-strength substitute, saving time and hardware on structural wood framing projects.
• The Double-Barrier Coating delivers corrosion resistance equivalent to hot-dip galvanization, making it a dependable choice for exterior applications and connections in preservative-treated wood where standard fasteners may corrode prematurely.
• The SawTooth point and 6-lobe T40 drive work together to minimize installation effort - fast starts, low torque, and reduced cam-out mean this screw installs efficiently even in dense timber without predrilling in most situations.
• IAPMO UES ER-192 code listing and compliance with IRC and IBC requirements means this fastener is ready for permitted structural wood framing work, reducing the risk of inspection delays or rejected connections.

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter (in.): 0.220
• Length (in.): 10
• Head Diameter (in.): 0.760
• Head Type: Washer Head
• Drive Type: T40 6-Lobe
• Point Type: SawTooth Point
• Thread Length (in.): 3
• TPI: 5
• Coating: Double-Barrier Coating
• Finish: Double-Barrier Coating
• Color: Tan

Available Pack Options

• SDWS221000DB-R12: 12 Pk - includes one 6-lobe, T40 driver bit
• SDWS221000DB-R50: 50 Pk - includes one 6-lobe, T40 driver bit
• SDWS221000DB: 250 Pk - includes two 6-lobe, T40 driver bits

Approved Applications

• Fastening Wood-to-Wood
• Crating

Install With

• SDWS screws install best with a low-speed 1/2-in. drill and 6-lobe, T40 driver bit (included)

Frequently Asked Questions

Does this screw require predrilling before installation?

In most applications, predrilling is not required. The SawTooth point is specifically designed to ensure fast starts and reduce installation torque, allowing the screw to seat without a pilot hole in the majority of wood framing scenarios.

Is this screw suitable for use with preservative-treated lumber or exterior applications?

Yes. The Double-Barrier Coating provides corrosion resistance equivalent to hot-dip galvanization, making this screw suitable for certain exterior and preservative-treated wood applications as described in the IAPMO UES ER-192 evaluation report.

What code standards does this timber screw meet?

This screw is code listed in IAPMO UES ER-192 and meets IRC and IBC code requirements for most common wood framing applications, making it appropriate for permitted structural construction work.

What driver bit is needed to install this screw?

The SDWS Timber Screw uses a T40 6-Lobe drive. It installs best with a low-speed 1/2-in. drill and a 6-lobe T40 driver bit. A T40 driver bit is included with the screws.