Simpson Strong-Tie SWD18312DBB-R50 Description

The Strong-Drive SWD Double-Threaded Screw is a high-performance structural fastener engineered for exterior wood-to-wood applications, featuring a corrosion-resistant double-barrier coating and a low-profile head for a clean finish.

Simpson Strong-Tie SWD18312DBB-R50 Includes

• (50) Double-Threaded Wood Screw

Simpson Strong-Tie SWD18312DBB-R50 Features

• Double-thread design for superior withdrawal resistance
• Unthreaded mid-shank for tight wood connections
• Corrosion-resistant double-barrier coating
• Low-profile head for a clean, flush finish
• Precision engineered for consistent performance

Simpson Strong-Tie SWD18312DBB-R50 Applications

• Deck ledger attachments to rim joists
• General exterior wood framing
• Pergolas, porches, and outdoor structural assemblies
• Wood-to-wood connections requiring high withdrawal strength

Simpson Strong-Tie SWD18312DBB-R50 Installation Overview

1. No pre-drilling required in most applications
2. Use with a standard driver or impact driver
3. Drive the screw until the head is flush with the wood surface
4. Compatible with treated lumber following coating guidelines

Simpson Strong-Tie SWD18312DBB-R50 Specifications

Diameter 0.180″ Finish Double-Barrier Coating Length 3-1/2″ Material Carbon Steel Color Black Drive type T30 6-Lobe Head diameter 0.315″ Head type Cylinder Head Point type Screw Chisel Point Quantity 50 Shank style Unthreaded Mid-Shank Thread length 1-5/8″ Thread type Double Thread

NOTE: Ensure screws are installed straight into the side grain of the wood main member with the screw axis at a 90 Degree angle to the wood fibers.