They hold together everything from the most delicate watch to the largest bridge. The world is literally kept from coming apart by screws and bolts, and yet we don’t often give a thought to these ...

Bolts can be frustrating. After taking the trouble to measure a bolt's thread size and making sure you have the right nut, it's still possible to end up with a bolt that's too long for its job.

Taps and dies are great for cutting new threads or repairing old threads on metals, plastics and other hard materials. Taps cut threads on the inside of holes and dies cut threads on the outside of ...

Cutting threads is a necessary task in the home shop. Fortunately, most of the time, your thread taps and tap wrench cut threads into your workpiece without a hitch, but occasionally, you'll hear a ...

Twist drills do not make accurately sized or good finish holes; a reamer of some type is often used to cut the final size and finish. A reamer will not make the original hole; it will only enlarge a ...

The strength of some internal threads is more sensitive to tap diameter than previously thought. • Cold-formed threads are no stronger than cut threads when holes are correctly sized. • Cut threads ...