The Simpson Strong-Drive SDWS Timber Screw in 0.220" diameter by 6" length with Double-Barrier Coating is engineered to deliver a fast, high-strength alternative to through-bolting and traditional lag screws in wood-to-wood framing applications. Designed for both professional contractors and do-it-yourselfers, this structural wood screw combines a bold thread profile, SawTooth point, and corrosion-resistant tan finish to handle demanding exterior and preservative-treated wood installations. Code listed in IAPMO UES ER-192, it meets IRC and IBC requirements for the most common wood framing tasks - offering verified performance and peace of mind on every job site.

Key Features

• Bold thread design with 5 TPI and 3" thread length - delivers superior holding power in wood-to-wood connections, reducing the number of fasteners needed to achieve structural strength.
• SawTooth point - ensures fast starts and reduces installation torque, eliminating the need for predrilling in most applications and saving significant time on the job.
• Large 0.760" diameter washer head - provides a wide bearing surface that distributes load across the wood, minimizing pull-through and surface damage.
• Underhead nibs - allow the head to seat flush to the wood surface with reduced splintering, resulting in cleaner, more professional-looking installations.
• Double-Barrier Coating finish in tan - provides corrosion resistance equivalent to hot-dip galvanization, making this screw suitable for certain exterior environments and preservative-treated lumber applications.
• T40 6-Lobe drive system - delivers positive bit engagement that makes driving easier, reduces cam-out, and extends driver bit life compared to standard drive types.
• Size identification marked on the screw head - allows quick on-site identification without sorting through packaging, reducing confusion when multiple screw sizes are in use.
• Code listed in IAPMO UES ER-192 and meets IRC and IBC requirements - confirms suitability for most common wood framing applications without additional engineering sign-off in many jurisdictions.

Why This Product

• Replaces through-bolts and lag screws without predrilling - the SawTooth point and bold 5 TPI thread allow direct installation into timber, cutting labor time and eliminating the need for a separate drill bit in most wood-to-wood framing scenarios.
• Rated for exterior and preservative-treated wood - the Double-Barrier Coating delivers corrosion resistance equivalent to hot-dip galvanization, making this screw a dependable choice for outdoor structures, decking framing, and treated lumber connections where standard screws would fail prematurely.
• Code compliance built in - IAPMO UES ER-192 listing and IRC/IBC compliance means inspectors can verify installation without custom engineering documentation, streamlining project approvals.
• Engineered for one-tool installation - the T40 6-Lobe drive system works with a standard low-speed 1/2-in. drill and included driver bit, keeping the workflow simple and the tool requirement minimal for both professionals and DIYers.

Specifications

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

Available Pack Options

• SDWS22600DB-R12: 12 Pk - includes one 6-lobe, T40 driver bit
• SDWS22600DB-R50: 50 Pk - includes one 6-lobe, T40 driver bit
• SDWS22600DBMB: 250 Pk - includes one 6-lobe, T40 driver bit
• SDWS22600DB: 500 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, no predrilling is required. The SawTooth point is specifically designed to ensure fast starts and reduce installation torque, allowing the screw to self-start in wood without a pilot hole in the majority of wood-to-wood framing situations.

Is this screw rated for use with pressure-treated lumber and 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 driver bit is needed to install this screw?

This screw uses a T40 6-Lobe drive. A low-speed 1/2-in. drill paired with a 6-lobe T40 driver bit is recommended for best results. A T40 driver bit is included with the screws.

Is this screw code listed for structural wood framing applications?

Yes. The Simpson Strong-Drive SDWS Timber Screw is code listed in IAPMO UES ER-192 and meets IRC and IBC code requirements for most common wood framing applications, making it a compliant choice for structural connections on permitted projects.