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Do you have to use a special drill in orderto tap threads?
I am new to this so I am not totally sure what I am talking about. But I am supposed to be cutting internal threads in a rod that are 5/16 x 18 UNC. I know that I am supposed to drill a hole first and than use a tap to cut the threads. But is there a specific type of drill bit that you are supposed to use? I know that you have to use a specific size. But are there different kinds? The chart says to use a size F .2570 drill. So as long as the bit says F, I should be okay right? Or is there specific type to use? This may sound stupid, but I just want to know
- spaceace1122Lv 48 years agoFavorite Answer
F or 1/4" bit should be fine to tap 5/16'' threads. You can use a cordless drill, corded drill, drill press or hand tap to tap the threads.
If you're new to it I would suggest the hand tap as it would be the safest, and cheapest. It is basically a handle that holds the tap.
Get a tap, and a little bit of wax and you be good to go.
Remember though, safety first.Source(s): years of fabrication experience
- Born YesterdayLv 78 years ago
I'm glad you were able to interpret the need for a .2570 bit.
Selecting the bit depends on the material you wish to drill into.
Cutting threads into a rod (co-axially?) will depend on the
rod's hardness and composition (wood?,brass?, mild steel?, tool steel?)
You cannot use a drill bit to make a hole in another drill bit.
At a minimum, you will need a bit rated HHS. Possibly HHSco
Either identify the rod material, or bring it with you when
purchasing the drill bit from a knowledgeable supplier.
- RogerLv 78 years ago
Use a good quality size F (0.2570) drill bit, make sure the hole is drilled perpendicular to the rod. Then run the tap through the drilled hole. Use machine oil on the tap