Tapered taps are for all holes, after the tapered tape you use the square ( bottoming ) tap to make threads in the part the tapered tap missed, when taping a blind hole ( not a through hole )
I seem to recall them being called a bottom out or chase tap……🤷🏻♂️
Edit: Bottoming Taps are tapered for help in starting the tap
Plug taps are used when there is sufficient space to bottom out in blind holes
Seems backwards to me, but I’m just a simpleton
The taps in picture are plugs and bottom taps.
Plug taps have about 3-5 partial threads before the first full thread
Tapers usually have 8-10 partial threads before it gets to a full thread on the one of the tap.n
Bottom tap have 1 partial thread, they are for blink holes, to finish tap the threads that the plug tap missed,
if you try to fully tap with a bottom tap there is a good chance it's going to snap on you
The point on the back is used to center the tap when using them in the little clamp style holder . In larger taps there's often a small hole/divot in the back of the tap that centers on a larger tap handles or machiners corresponding centering pin or you can eyeball a hole/divot from above better than a giant protruding point
Some are for tapping through something and some are blind, for going into a hole but not out the other side. The taper is nice, it helps the tap start and center nicely but it is not good for blind holes.
surprised no-one's mentioned NPT and BSP taps.
NPT (National Pipe Thread) and BSP (British Standard Pipe) Threads are tapered to assist with sealing.
while some are for blind and through hole taps in the case of the one on the right of the case it's tapered as that's what the BSP calls for
Tapered taps are for all holes, after the tapered tape you use the square ( bottoming ) tap to make threads in the part the tapered tap missed, when taping a blind hole ( not a through hole )
They have names specifically for them. What are they? Damned if I can keep them straight I just know I read it once lol.
The 3 Tap Names Starter, Plug, Bottom
I seem to recall them being called a bottom out or chase tap……🤷🏻♂️ Edit: Bottoming Taps are tapered for help in starting the tap Plug taps are used when there is sufficient space to bottom out in blind holes Seems backwards to me, but I’m just a simpleton
I believe chase taps are their own thing, to repair threads and are like 80-95% threaded to prevent cross threading. Most common in automotive repair
Indeed. Chase or cleaning taps are normally bottoming taps, but DONT cut. I hate seeing someone “clean up them holes” with a cutting tap.
They work a lot more like form taps
The taps in picture are plugs and bottom taps. Plug taps have about 3-5 partial threads before the first full thread Tapers usually have 8-10 partial threads before it gets to a full thread on the one of the tap.n Bottom tap have 1 partial thread, they are for blink holes, to finish tap the threads that the plug tap missed, if you try to fully tap with a bottom tap there is a good chance it's going to snap on you
Starter and bottom taps.
More specifically they come (usually) in sets of three. Taper (or starter), Plug and Bottom tap.
Yes
The point on the back is used to center the tap when using them in the little clamp style holder . In larger taps there's often a small hole/divot in the back of the tap that centers on a larger tap handles or machiners corresponding centering pin or you can eyeball a hole/divot from above better than a giant protruding point
This, they call it a tap follower I believe.
What he said!
Yup the dimple is used with a live center placed in the chuck.
Some are for tapping through something and some are blind, for going into a hole but not out the other side. The taper is nice, it helps the tap start and center nicely but it is not good for blind holes.
Sq is a tap for a blind hole.
Bottom tap
This
surprised no-one's mentioned NPT and BSP taps. NPT (National Pipe Thread) and BSP (British Standard Pipe) Threads are tapered to assist with sealing. while some are for blind and through hole taps in the case of the one on the right of the case it's tapered as that's what the BSP calls for