Simpson Strong-Tie SWD18312DBB-R50 Strong Drive® SWD Double-Threaded™ Screw — 0.180-in. x 3-1/2-in. T30, Black (50-Qty)

Designed for stealth, strength and speed, the Simpson Strong-Tie® Strong-Drive® SWD Double-Threaded™ screw is ideal for securing two wood members together on exterior or interior structural jobs. Available in an assortment of lengths, this innovative fastener can be used in a variety of applications such as knee bracing, fastening beams to posts, beams to joists, or guardrails to posts with ease. The screw features a chisel point for reduced splitting, a smooth, unthreaded mid-shank to secure wood members tight, and a compact head for low visibility. Code listed for structural applications, the SWD® screw has a black, exterior-grade, double-barrier coating for corrosion resistance.

This Simpson product is designed for construction, connector, fastening, anchoring, and structural applications where dependable performance, durability, and jobsite-ready installation matter.

Features

• Professional grade — engineered for strength, versatility and reliability
• Double-thread design and smooth mid-shank pull members together securely
• Black, exterior-grade, double-barrier coating for corrosion resistance
• Chisel point provides easy driving for angled installation and reduced splitting
• Compact cylinder head design for low visibility, concealed installations
• T30 6-lobe driver bit for secure driving
• Code listed and load rated for structural applications
• Length: 3-1/2 inches
• Quantity: 50

Application

• Decks — Joist Connections to Beam
• Fastening Wood-to-Wood
• Fastening Truss/Rafter-to-Plate
• Decks — Stair Stringer and Treads
• Heavy Timber
• Mass Timber / Cross-Laminated Timber
• Engineered Wood — Multi-Ply Fastening
• Engineered Wood
• Decks — Joist to Beam/Ledger Attachments
• Timber Framing
• Crating
• Decks — Guard Rail Post to Deck
• Decks — Beam Assemblies
• Framing — Wood
• Decks — Beam-to-Post
• Wood / Residential Construction

Specifications

• ERP Part Number: SWD18312DBB-R50
• UPC: 707392025108
• GTIN: 707392025108
• Feature 01: Professional grade — engineered for strength, versatility and reliability
• Feature 02: Double-thread design and smooth mid-shank pull members together securely
• Feature 03: Black, exterior-grade, double-barrier coating for corrosion resistance
• Feature 04: Chisel point provides easy driving for angled installation and reduced splitting
• Feature 05: Compact cylinder head design for low visibility, concealed installations
• Feature 06: T30 6-lobe driver bit for secure driving
• Feature 07: Code listed and load rated for structural applications
• Feature 08: Length: 3-1/2 inches
• Feature 09: Quantity: 50
• Applications List: Decks — Joist Connections to Beam
• Applications List.1: Fastening Wood-to-Wood
• Applications List.2: Fastening Truss/Rafter-to-Plate
• Applications List.3: Decks — Stair Stringer and Treads
• Applications List.4: Heavy Timber
• Applications List.5: Mass Timber / Cross-Laminated Timber
• Applications List.6: Engineered Wood — Multi-Ply Fastening
• Applications List.7: Engineered Wood
• Applications List.8: Decks — Joist to Beam/Ledger Attachments
• Applications List.9: Timber Framing
• Applications List.10: Crating
• Applications List.11: Decks — Guard Rail Post to Deck
• Applications List.12: Decks — Beam Assemblies
• Applications List.13: Framing — Wood
• Applications List.14: Decks — Beam-to-Post
• Applications List.15: Wood / Residential Construction
• Assembled Depth - Imperial: 0.315
• Assembled Depth UOM - Imperial: in.
• Assembled Height - Imperial: 3.50
• Assembled Height UOM - Imperial: in.
• Assembled Width - Imperial: 0.315
• Assembled Width UOM - Imperial: in.
• Base Product ID: SWD-DBB_Screw
• Base Product Name: Strong-Drive® SWD Double-Threaded™ Screw
• Brand Name: Simpson Strong-Tie®
• Category Tree (Computed): Fasteners > Exterior Wood Screws > Hand-Drive Screw
• Coating: Double-Barrier Coating
• Color: Black
• Country of Origin: TW
• Customer Unit: Yes
• Display Unit/Measure: EA
• Drive Type: T30 6-Lobe
• Finish: Double-Barrier Coating
• GUID: 166743590479565621931062467902976535531
• Head Diameter (in.): 0.315
• Head Type: Cylinder Head
• Length (in.): 3 1/2
• Logo Image: https://images.salsify.com/image/upload/s--Lkh4Jm6c--/vkrqlmpfxgflsa4yytuq.png
• Measurement Unit Text: each
• MFG Name: Simpson Strong-Tie®
• Number Category Description: UPC
• Package Depth - Imperial: 2.91
• Package Depth UOM - Imperial: in.
• Package Height - Imperial: 2.09
• Package Height UOM - Imperial: in.
• Package Width - Imperial: 7.05
• Package Width UOM - Imperial: in.
• Packaging Quantity: 50
• Packaging Type: Box
• Point Type: Screw Chisel Point
• Product Class: Hand-Drive Screw
• Product Includes: (1) T30 6-lobe driver bit (replacement bit BIT30T-2-R2)
• Prop 65 - Cancer: Wood Dust
• Prop 65 - Long Text: WARNING! This product can expose you to chemicals including wood dust which is known to the State of California to cause cancer. For more information go to www.P65Warnings.ca.gov
• Prop 65 - Short Text: WARNING! Cancer - www.P65Warnings.ca.gov
• Prop 65 Warning: Yes
• Quantity: 1
• Shank Diameter (in.): 0.180
• Shank Type: Unthreaded Mid-Shank
• Shipping Weight: 1.42
• Short Product Name: .180 x 3-1/2IN T30 DBL BARRIER BLK 50CT
• Strongtie.com URL: https://www.strongtie.com/strongdrive_exteriorwoodscrews/swd-dbb_screw/p/strong-drive-swd-double-threaded-screw
• Subcategory: Fasteners
• Subcategory 2: Exterior Wood Screws
• Thread Length (in.): 1 5/8
• Thread Type: Double Thread
• TPI: Variable
• Warranty PDF: https://images.salsify.com/image/upload/s--K_9ww28_--/bgqxyqo1uhaqsqcvudu7.pdf
• Brand Video: https://images.salsify.com/video/upload/s--N-SMFYx9--/wpz3sdgci9c512ppr9df.mp4
• CAR Reference: 10707392025105