TimberLok Heavy Duty Wood Screws
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:
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.
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).
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.
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.
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
