On a bolt, you can sometimes clean out the thread with a knife or hacksaw blade enough to start the nut and tighten it to reform the thread past the damage. In a hole, they make thread chasers that will recut the the thread. You can just run a tap in the hole and it will usually find the old grooves.
Eyelet
when a spiral groove is cut over a hole, then it is nut thread. when a spiral groove is cut over a shaft, then it is screw thread.
The difference between internal flush and full hole thread is that the roots of the full-hole tool joints are rounded, and the roots for the internal-flush joints are flat.
That is hole that has been drilled, then had a thread 'tapped' into it so you can insert a machine screw or bolt.
The hole in a needle is called an eye. The eye of the needle is where you pull the thread through.a hole
It has got to be tapered to get in a fresh hole. Then you can finish it up with a square one to tap out the bottom of the hole.
It has got to be tapered to get in a fresh hole. Then you can finish it up with a square one to tap out the bottom of the hole.
That matters. Are you a boy or a girl. If a boy lets hope you don't wear My Little Ponie underwear.
A thread chaser is used to clean the thread marks in a drilled hole or bolt cavity. It should be used with a lubricant to make sure the threads are smooth and clean, before restoring the rest of the pieces.
a helical groove in a cylindrical hole (female thread), formed by a tap or lathe tool, or a helical ridge on a cylindrical bar, rod, shank, etc
Taps and dies are used in threading. To make an internal thread, you drill a hole smaller than the thread width, then slowly screw a 'tap' into it cutting a thread very slowly. -For an external thread, you choose a rod or bolt larger than the final thread, then screw a hard, threaded disc down onto it.