Simpson Strong-Tie SWD22812DBB-R30 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 SWD22812DBB-R30 Includes

• (30) 0.235 in. x 8-1/2 in. Double-Threaded Wood Screw

Simpson Strong-Tie SWD22812DBB-R30 Features

• Double-threaded design for superior withdrawal resistance
• Unthreaded mid-shank for tight wood connections
• Black double-barrier coating for corrosion resistance
• Flush head design for a clean finish
• Precision engineered for consistent performance

Simpson Strong-Tie SWD22812DBB-R30 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 SWD22812DBB-R30 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 SWD22812DBB-R30 Specifications

Diameter 0.235 in. Length 8-1/2 in. Material Carbon Steel Finish Double-Barrier Coating Color Black Drive Type T40 6-Lobe Head Diameter 0.394 in. Head Type Cylinder Head Point Type Screw Chisel Point Thread Length 3-3/4 in. Thread Type Double Thread Shank Style Unthreaded Mid-Shank Quantity 30