Pocket-Hole Joints are strong, as strong as mortise and tenon joints. Pocket-Hole Joinery is both fast and precise when using Kreg® Pocket-Hole Jigs.
When joining members with pocket hole screws, it is important that the screw's threads are embedded in the second piece only (piece A).
As seen, the screw's threads do not span between the two pieces to be joined. Selecting the correct screw length is essential. If the screw's threads bridge between the two pieces, then the joint will often fail to be pulled tightly together resulting in weak gluing. Use the following table as a guide for proper screw length:
|1/2 in. to 5/8 in.||1 in.|
|3/4 in.||1-1/4 in.|
|7/8 in. to 1-1/8 in.||1-1/2 in.|
|1-1/4 in. to 1-3/8 in.||2 in.|
|1-1/2 in & up||2-5/8 in.|
Setting the proper depth of the Stepped Drill Bit is also essential. The stepped drills have an adjustable depth stop collar that ensures proper depth. The smaller-diameter pilot-hole portion of the bit should completely drill through the first member (part B) and then drill a pilot hole in the second member (part A). The larger-diameter portion of the stepped drill bit will then cut the shoulder in the first part (Part B) at a depth that will allow all the threads to be embedded in the second part (Part A).
Selecting screws with the correct threads will provide maximum pull-out strength which will pull the joint tightly together. McFeely's branded screws come in four thread types for the following materials: