Simpson Strong-Drive SDWH Timber-Hex Screw with Double-Barrier Coating delivers reliable structural and general-purpose wood fastening performance with the speed and convenience of a hex-drive design. Built for contractors and do-it-yourselfers who need a proven fastener for wood-to-wood connections and crating work, this 0.195 in. shank x 3 in. screw features a large hex washer head, a SawTooth point for clean entry, and a Double-Barrier Coating that provides corrosion resistance equivalent to hot-dip galvanization - making it a dependable choice for applications where durability matters. Code listed under IAPMO-UES ER-192 and meeting 2015 and 2018 IRC and IBC requirements for common wood framing, this hex timber screw removes guesswork from compliance on the job site.

Key Features

• 5/16 in. Hex Drive (Large Hex Washer Head) - works with standard hex drivers and sockets, making installation fast and compatible with tools most contractors already own
• SawTooth Point - cuts cleanly into wood fibers on entry, reducing splitting and eliminating the time-consuming step of pre-drilling pilot holes
• Double-Barrier Coating - provides corrosion protection equivalent to hot-dip galvanization, supporting use in exterior environments and with certain preservative-treated lumber
• 0.650 in. Head Diameter - the wide bearing surface distributes load effectively across the wood, reducing pull-through risk in structural connections
• 1-1/2 in. Thread Length at 6 TPI - aggressive threading bites firmly into wood for strong, secure pull-down and load transfer in structural applications
• 0.195 in. Shank Diameter - a robust shank size provides the shear and tensile strength needed for demanding wood-to-wood fastening tasks
• Code Listed - IAPMO-UES ER-192 - meets 2015 and 2018 IRC and IBC requirements, so inspections and permit approvals go more smoothly

Why This Product

• The SawTooth point eliminates pre-drilling compared to traditional lag bolts, saving measurable time on structural framing and crating jobs where dozens or hundreds of fasteners are driven in a single session
• The Double-Barrier Coating matches hot-dip galvanization performance, making these screws suitable for exterior and preservative-treated wood applications where standard uncoated fasteners would corrode prematurely
• IAPMO-UES ER-192 code listing for common wood framing under 2015 and 2018 IRC and IBC means you can specify these fasteners with confidence on permitted residential and commercial projects
• The hex-head drive design offers a practical alternative to star or square drive patterns, allowing crews to use hex sockets and nut drivers they already carry - reducing tool changeovers and improving workflow efficiency

Specifications

• Brand: Simpson Strong-Tie
• Shank Diameter (in.): 0.195
• Length (in.): 3
• Head Diameter (in.): 0.650
• Head Type: Large Hex Washer Head
• Drive Type: 5/16 in. Hex
• Thread Length (in.): 1 1/2
• TPI: 6
• Point Type: SawTooth Point
• Coating/Finish: Double-Barrier Coating
• Country of Origin: Taiwan

Available Pack Options

• SDWH19300DB-RP1: 2 Pk
• SDWH19300DB-R12: 12 Pk - includes one 5/16-in. hex driver bit
• SDWH19300DB-R50: 50 Pk - includes one 5/16-in. hex driver bit
• SDWH19300DBMB: 250 Pk - includes one 5/16-in. hex driver bit
• SDWH19300DB: 1000 Pk - includes two 5/16-in. hex driver bits

Approved Applications

• Fastening Wood-to-Wood
• Crating

Frequently Asked Questions

Do these screws require pre-drilling before installation?

No. The SawTooth point is designed to cut through wood on contact, eliminating the need for pre-drilling a pilot hole. This makes installation faster and more efficient compared to traditional lag bolts, particularly on high-volume framing and crating work.

Are these screws suitable for use with pressure-treated lumber?

Yes. The Double-Barrier Coating provides corrosion resistance equivalent to hot-dip galvanization, making the Strong-Drive SDWH Timber-Hex screw suitable for some exterior and preservative-treated wood applications where enhanced corrosion protection is required.

What code standards does this screw meet?

This screw is code listed under IAPMO-UES ER-192 and meets both 2015 and 2018 IRC (International Residential Code) and IBC (International Building Code) requirements for several common wood framing applications, supporting use on permitted residential and commercial construction projects.

What size driver bit or socket is needed to drive this screw?

These screws use a 5/16 in. hex drive, so they can be installed with a standard 5/16 in. hex bit, nut driver, or socket - tools commonly found in most contractor and DIY tool sets without any specialty driver required.