ThruLok screw bolt fastening system
What Is ThruLOK
FastenMaster ThruLOK 6 ¼″ Screw Bolt System
FastenMaster ThruLOK 7″ Through‑Bolt Replacement
FastenMaster ThruLOK 9 ½″ Post Connector
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ThruLOK is part of FastenMaster’s LOK line of structural fasteners.
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It’s engineered to replace traditional ½″ carriage bolts or through-bolts in many structural wood-to-wood connections.
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Instead of a simple bolt, ThruLOK is a three-part system:
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According to FastenMaster, no pre-drilling is required; you can drive it with an 18 V cordless drill.
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The fasteners have a galvanized coating that meets ACQ (preservative-treated wood) corrosion standards.
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It’s code-compliant (per FastenMaster) for IBC / IRC applications.
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FastenMaster offers a lifetime performance guarantee on ThruLOK (for structural / corrosion performance) when installed properly.
Key Specs & Sizes
Lengths: Available in at least 3 common lengths for deck / structural applications:
- ~6 ¼″ — typically for a 4×4 post to a 2× joist.
- ~7″ — for notched 6×6 bearing beams.
- ~8″ — for double 2× to single 4× post / rim-joist connections.
- Drive: Uses a hex head on the screw; the LOK-Nut has wings so you don’t need a wrench to tighten.
- Corrosion / Material: The parts are galvanized, “meets IRC ACQ requirement.”
- Load / Application: Designed for structural connections like posts to beams, multi-ply beams, girder trusses.
Advantages / Why Use ThruLOK
- Speed: Because it’s a self-drilling / self-tapping system, you don’t need to pre-drill, which saves labor.
- Strength: Offers similar (or better) strength than traditional through-bolts, while being easier to install.
- No Wrenches Needed: The LOK-Nut is designed so you can thread it on by hand and tighten with a drill, no socket or ratchet required.
- Corrosion Resistant: Galvanized finish means it’s suitable for treated lumber.
- Versatile Use: Good for common deck / structural scenarios: deck posts, multi-ply beams, notched posts, etc.
- Lifetime Guarantee: FastenMaster backs the ThruLOK system for the life of the project (for structural + corrosion when used / installed correctly).
About this product...
The ThruLok fastening system is used by professional contractors nationwide to meet code and lower costs when attaching deck posts. The 8" Thru Lok has been tested and proven to meet 2012 IRC requirements for joist connections and guardrail post to rim connections. It is a fact that by using the ThruLok system you will save money and time.
DETAILS:
- No pre drilling required
- Installs with an 18-volt cordless drill
- No drill bits or wrenches required
- Galvanized coating meets IRC ACQ corrosion requirement
- Lifetime performance guarantee
- Sold in packs of 24
- Hex Head
SIZES:
- 6-1/4"
- 7"
- 8"
ThruLOK is a code-compliant way to attach deck posts and to secure carrying beams.
Click HERE for Technical Evaluation Report
