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Self-tapping pocket screws are used for pocket hole joints. Pocket screws are generally more expensive, but they are needed for a tight, strong joint. Pocket screws have a wide washer head to spread the load for a firm bond, and prevent screwing too far into the joint and cracking the wood.
The pocket holes require two drilling operations to be completed. The first is to counterbore the pocket hole itself, which houses the screw head within the member. This hole is stopped 1 ⁄ 4 in (6.4 mm) or so from the edge of the frame member. The second step is to drill a pilot hole concentric with the pocket hole which extends through the ...
Pocket-hole joinery: A countersunk screw is driven into the joint at an angle. Biscuit: A wooden oval is glued into two corresponding crescent-shaped slots. Floating tenon joint Also known as a loose tenon joint, a type of mortise and tenon joint where both work pieces are mortised to receive a double-ended tenon. Stitch and glue
Typically an installer uses a hammer drill to make a pilot hole for each concrete screw and a powered impact driver to drive the screw. The drill hole should be 1/2" longer than the depth penetration of the screw. The screw itself should be drilled a minimum of 1" into the concrete to hold effectively and a maximum of 1-3/4" or the threads will ...
A common use for a boss is to locate one object within a pocket or hole of another object. For instance, some motors use a precisely machined boss on the front face to locate it on the mating part. Like a process on a bone, bosses on castings can provide attachment points or bearing surfaces. [2]
Example (inch, coarse): For size 7 ⁄ 16 (this is the diameter of the intended screw in fraction form)-14 (this is the number of threads per inch; 14 is considered coarse), 0.437 in × 0.85 = 0.371 in. Therefore, a size 7 ⁄ 16 screw (7 ⁄ 16 ≈ 0.437) with 14 threads per inch (coarse) needs a tap drill with a diameter of about 0.371 inches.