The Simpson Strong-Drive SDWS TIMBER Screw (0.220 in. x 8 in., E-coat) is a heavy-duty structural wood screw engineered for cross-laminated timber construction, mass timber assemblies, log-home construction, and general interior wood-to-wood fastening applications. Finished in a black E-coat electrocoating for a clean, low-profile appearance suited to interior use, this 8-inch structural fastener combines a SawTooth point, serrated threads, and a T40 6-lobe drive system to deliver faster, easier installation than comparable lag screws - with less torque required and no extra washers needed.

Key Features

• SawTooth Point - enables fast starts and significantly reduces installation torque, eliminating the need for predrilling in most applications so work moves faster with less effort
• Serrated Thread Design at 5-1/4 TPI - reduces splitting and wood damage during installation, protecting the structural integrity of timber members
• Low Profile Washer Head (0.760 in. diameter) - the large bearing surface pulls wood members together firmly without requiring additional washers, saving time and materials
• T40 6-Lobe Drive - provides a positive, secure bit engagement that makes the screw easier to drive and extends bit life, reducing operator fatigue on large timber projects
• 0.220 in. Shank Diameter with 3 in. Thread Length - the full-shank construction and threaded engagement zone deliver the structural load capacity needed for mass timber and cross-laminated timber connections
• E-coat Electrocoating Finish - a durable black electrocoated surface designed for interior applications, providing a uniform, corrosion-resistant finish appropriate for interior wood construction environments
• Code Listed under IAPMO-UES ER-192 - meets IRC and IBC code requirements for common wood framing applications, giving builders and inspectors confidence in structural compliance

Why This Product

• Designed specifically for mass timber and cross-laminated timber construction, this screw addresses the high-torque, high-splitting challenges of large-format structural wood connections - the SawTooth point and serrated threads work together to protect timber members during fastening
• The large-diameter low-profile washer head (0.760 in.) eliminates the need for separate washers, streamlining installation in log-home and heavy timber framing where dozens or hundreds of fasteners may be driven in a single project
• Code listing under IAPMO-UES ER-192 with compliance for both IRC and IBC means this fastener can be specified with confidence on permitted commercial and residential structural projects without custom engineering
• The included T40 6-lobe driver bit means installers can get to work immediately, and the positive-engagement drive system reduces cam-out, improving efficiency and bit longevity on high-volume timber framing jobs

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter (in.): 0.220
• Length (in.): 8
• Head Diameter (in.): 0.760
• Head Type: Low Profile Head
• Drive Type: T40 6-Lobe
• Thread Type: Serrated Threads
• Thread Length (in.): 3
• TPI: 5 1/4
• Point Type: SawTooth Point
• Coating: E-coat Electrocoating
• Finish: E-coat Electrocoating
• Color: Black
• Country of Origin: Taiwan

Available Pack Options

• SDWS22800-R50: 50 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)
• SDWS22800: 250 Pk - includes T40, 6-lobe driver bit (replacement bit: BIT40T-134-R2)

Approved Applications

• Fastening Wood-to-Wood
• Log-Home Construction

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 self-start in wood without a pilot hole in the majority of interior timber and wood-to-wood fastening scenarios.

What driver bit does this screw use, and is one included?

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

Is this screw code compliant for structural framing applications?

Yes. 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, making it suitable for permitted structural projects where code compliance is required.

What types of construction is this screw designed for?

This screw is designed for cross-laminated timber construction, mass timber construction, log-home construction, and general interior wood-to-wood fastening applications. It is an interior-grade fastener finished with E-coat electrocoating and is not intended for exterior or high-moisture environments.