4″ SDWS Timber Screw SDWS22400DBMB (250)
0.220 X 4″ with 2-3/8″ of thread length Strong-Drive SDWS Timber Screw, 250 pack.
Designed to provide an easy-to-install, high-strength alternative to through-bolting and traditional lag screws. The SDWS structural wood screws are ideal for the contractor and do-it-yourselfer alike.
Bold thread design that provides superior holding power
Patented 4CUT™ tip that ensures fast starts, reduces installation torque and eliminates the need for pre-drilling in most applications
Under-head nibs that offer greater control when seating the head
Large washer head provides maximum bearing area (0.75″ head dia.)
Size identification on all SDWS screw heads
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 Connections Including Ledgers