Simpson Strong-Tie SDWS22400DBMB 4" Length 0.750" Head Diameter 0.220" Shank Diameter T40 6-Lobe Drive Washer Head 2-3/8" Thread Length SawTooth™ Point Double-Barrier Coating Strong-Drive® SDWS TIMBER Screw (Exterior Grade) (250 ct)

Designed to provide an easy-to-install, high-strength alternative to through-bolting and traditional lag screws. The Strong-Drive SDWS Timber screw 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.

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.

Applications

Structural wood-to-wood and engineered-wood connections including ledgers.

Product Includes

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