Simpson Strong Tie SDWS Timber Screw (Double Barrier Coating)

Designed to provide an easy-to-install, high-strength alternative to through-bolting and traditional lag screws. The Strong-Drive SDWS Timber Screw (Exterior Grade) is ideal for the contractor and do-it-yourselfer alike. It is code listed under IAPMO UES ER-192 and meets 2015 and 2018 IRC® and IBC® code requirements for several common wood framing applications.

Key Features

  • SawTooth™ point ensures fast starts, reduces installation torque and eliminates the need for predrilling in most applications
  • Bold thread design provides superior holding power
  • Underhead nibs offer greater control when seating the head
  • Large low-profile washer head provides maximum bearing area (0.75″ head dia.)
  • Size identification on all SDWS screw heads
  • 6-lobe T40 drive provides positive engagement that makes the screw easy to drive and improves bit life (replacement driver bit — BIT40T-134-RC)
  • U.S. Patent 9,523,383

Double-barrier coating provides corrosion resistance equivalent to hot-dip galvanization, making it suitable for certain exterior and preservative-treated wood applications, as described in the evaluation report.


  • Structural wood-to-wood/engineered including ledgers; mass timber connections including CLT wall-to-wall, floor-to-floor, surface splines and lap joints

Product Includes

  • Retail and mini-bulk packs include one 6-lobe, T40 driver bit; bulk packs include two driver bits

ImageFastener LengthPackage QtyPriceQuantityAdd to CartWishlist ***
Fastener Length: 10Package Qty: 12pcsPrice: $22.33
Fastener Length: 10Package Qty: 50pcsPrice: $69.83
Fastener Length: 10Package Qty: 250pcsPrice: $289.64
Fastener Length: 8Package Qty: 12pcsPrice: $19.00
Fastener Length: 8Package Qty: 50pcsPrice: $56.99
Fastener Length: 8Package Qty: 250pcsPrice: $257.81
Fastener Length: 8Package Qty: 400pcsPrice: $356.52
Fastener Length: 6Package Qty: 12pcsPrice: $14.86
Fastener Length: 6Package Qty: 50pcsPrice: $42.66
Fastener Length: 6Package Qty: 250pcsPrice: $200.15
Fastener Length: 6Package Qty: 500pcsPrice: $344.03
Fastener Length: 5Package Qty: 12pcsPrice: $12.76
Fastener Length: 5Package Qty: 50pcsPrice: $33.83
Fastener Length: 5Package Qty: 250pcsPrice: $158.65
Fastener Length: 5Package Qty: 600pcsPrice: $317.73
Fastener Length: 4Package Qty: 12pcsPrice: $11.15
Fastener Length: 4Package Qty: 50pcsPrice: $28.00
Fastener Length: 4Package Qty: 250pcsPrice: $125.65
Fastener Length: 4Package Qty: 600pcsPrice: $248.03
Fastener Length: 3Package Qty: 12pcsPrice: $9.38
Fastener Length: 3Package Qty: 50pcsPrice: $22.83
Fastener Length: 3Package Qty: 950pcsPrice: $322.93

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