TimberLok Heavy Duty Wood Screw by Fastenmaster

TimberLok Heavy Duty Wood Screw)

What Is TimberLOK 

Key Purpose / Use Cases

• TimberLOK is FastenMaster’s structural wood screw, designed to replace 3/8″ lag screws in many heavy-duty wood-to-wood applications.
• Typical applications: attaching rafters or trusses to a top plate, building headers, stair stringers, landscape timbers, fences, deck framing, and other structural wood connections.
• It is part of FastenMaster’s “LOK” line of structural fasteners.

Key Features & Specifications

Here are the main technical features and benefits:

1. No Pre-drilling Required

   • TimberLOK screws are designed to be driven in without pilot holes.
     

   • The sharp tip and aggressive threads help the screw “bite” into dense or treated lumber.
     

2. Corrosion Resistance

   • TimberLOK is “approved in ACQ pressure-treated lumber.”
     

   • Coated to resist corrosion; according to product guides, it is “guaranteed corrosion resistance for the life of the project.”
     

   • Meets code: designed for IBC/IRC compliance (ICC-ES ESR-1078).
     

3. Head Style

   • Unique tapered (“countersinking”) head allows the screw to sit flush in the wood.
     

   • Uses a hex drive (5/16″ hex) for good engagement when driving.
     

   • Every pack includes a driver bit.
     

4. Length Options

   • Available in several lengths to match different structural needs: 2-1/2″, 4″, 6″, 8″, and 10″. cdn.palmerdonavin.com+1

   • This allows use for everything from smaller framing to large timber connections.

5. Strength / Performance

   • Because it’s a heavy-duty screw, it can provide similar or better shear strength than a 3/8″ lag bolt, but with faster install.
     

   • FastenMaster guarantees performance via their ProjectLife™ Guarantee (for structural fasteners).
     

Example Products

Here are some real-world variants:

• FastenMaster TimberLOK 10″ Heavy‑Duty Screw — Long screw for deep or large timber connections.
• FastenMaster TimberLOK 8″ Hex‑Head Structural Screw — Great for medium timber framing or rafter attachments.
• FastenMaster TimberLOK 4″ Structural Screw — Shorter size, useful for more compact connections.

Pros (Why Use TimberLOK)

• Speed: Because no pre-drilling is required, installation is faster compared to lag screws.
• Structural Strength: Offers comparable strength to lag bolts but with a simpler install.
• Versatility: Wide range of lengths makes it usable for many structural wood applications.
• Durable Coating: Suitable for treated lumber (like ACQ) — good for outdoor builds.
• Clean Finish: Tapered head countersinks, giving a clean, finished look when driven properly.

About this product...

The 6" TimberLOK is a code-compliant way to attach rafters or trusses to a double top plate. 

DETAILS:

• TimberLOK replaces 3/8" lag screws and enables you to complete wood-to-wood projects faster, easier and stronger.
• TimberLOK is approved in ACQ Pressure Treated Lumber.
• There is no need to pre drill withTimberLOK, it’s sharp point and aggressive threads zip right into the densest woods.
• Unique tapered head countersinks easily into wood for flush appearance
• Variety of lengths, from 4" to 10", to match every application
• Free bit in every package
• Available in 5 Screw Sizes x 5/16"
• Available in 50 pc. Boxes
• Steel with 3 ~ layer epoxy coating.

SIZES:

• 2-1/2"
• 4"
• 6"
• 8:
• 10"

Click HERE for Technical Evaluation Report