In the past, if you wanted to firmly connect two wood pieces, such as multi-ply beams or deck posts, you needed to use a through bolt. Through bolts have been the go-to standard for decades, but, thanks to innovations in design, engineering, and technology, there are now other options.
The ThruLOK system, which combines the strength of a through bolt with the efficiency of a LOK fastener, can be used to attach structural components while still complying with building codes.
The Previous Process: Through Bolts
Previously, if you were installing a carriage bolt or through bolt, you had to pre-drill a hole and install the through bolt with washers and a nut. Often, the bolt needed to be hammered through the hole, and a socket or wrench set was needed to tighten the connection.
While this created a strong grip between the connected boards, posts, beams, and whatever else was being fastened, the process was time-consuming and had numerous steps that required a variety of tools. Not only would you need a drill with the proper bit, you would also need a hammer and a socket set to firmly place the bolt.
The ThruLOK: A Solution to Time-Consuming Through Bolts
ThruLOK screws perform all of these steps with less time, less effort, and fewer tools. It’s a multi-use fastener that can replace through bolts and carriage bolts for many applications.
The ThruLOK system consists of three parts: the screw, the washer, and the nut.
Screw: The screw features a hex-head that creates a strong grip while driving the screw into wood. At the end of the screw, there is a special paddle-point that clears a path for the screw in even the toughest wood.
Washer: A galvanized washer helps to evenly distribute the load and keeps the screw from digging into the wood.
Nut: The ThruLOK nut, which is placed opposite the hex head and washer, has specially-designed teeth to grip the wood and hold firm. It also has wings that allow an installer to screw the nut down without the need for a wrench or socket.
This product is available in various sizes ranging from 6.25 inches to 9.5 inches. Here are the general uses for each size:
6.25”: Best for connecting 4×4 posts to 2x joists
7.0”: Best for connecting two 2x beams to a notched 6×6 post
8.0”: Used for connecting a 4×4 post to a double-rim joist or a single-rim joist and 2x blocking
9.5”: Ideal for attaching a 6×6 post with two 2x beams
These fasteners meet code requirements for treated wood and are approved by the ACQ.
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