Every thread is honestly the same
half the people say buy a set it’s good to have if you need it you can tap something right then and there
half the people say buy one tap at a time from a machinist supplier like McMaster Carr since the sets **** and will brake and dont work good.
then the first half respond saying they aren’t machinists and they cant wait a week for a tap to show up if they need one in a emergency because something broke
then a handful of reasonable people come in and say bro why you need taps as a mechanic anyway just get thread restore kits that’s prob what you need. And why you need dies just buy threaded rod.
so from those threads I got the idea to buy a few high quality taps from McMaster to have on hand in common sizes like m6 and m8 but then which thread? Okay I guess the most common one offhand I think it’s m6x1 and m8x1.25
okay great but which tap? Oh turns out there’s at least 4 types of tap designs. Since some taps can tap threads all the way to the bottom of a blind hole and some can’t and some taps are better for A or B but not C. Then some taps got drill bits built in for a single pass and some require drill bits. On and do you got the right drill bit for the tap? Since each one require a very exact size hole drilled and if your off by more than maybe 0.1mm it won’t work. maybe the metric ones require metric drill bits and maybe a 1/64 sae increment is good enough maybe it isn’t.
so here I am with no taps and no dies and a thread restore kit that I use every time I work on a car and I never had any issues. I’d like to eventually get some helicoils to keep on hand since that would be the most likely needed situation for a tap and could be resolved with those instead.
hope that helps save somebody $100+ on a Chinese tap and die set they will never need.
^ nailed it, buddy.
To the OP: What are you really needing to do?
Do you really need to TAP new threads on objects?
Or just clean up old cruddy threads that are full of gick and possibly a bit buggered up?
(Speaking of which... I gave my buddy my thread restoring kit a couple weeks ago, and now I'm going to have to drive over to his place so I can use it to fix a thread on a widget!)
If "thread chaser" is all you need, then that's all you need. Don't run a cutting tap into an existing threaded hole - you'll screw it up.
The one in the photo below I scored off a CL ad for $20 bucks. Chinese (PRC) made. Does the job: cleans threads. No more, no less.
Metric and SAE.
Looks like Harbor Freight only carries tap and die sets.
Here's a low-end "VEVOR" thread chaser set for $56 at Home Depot
Just a wild guess, but if you plug that into Amazon.com, put it in your "cart" and wait 30 minutes, you'll have all kinds of cheaper ones pop up in your feed ... happens to me every time.
Amazon.com $50 bucks. (Can't wait to see what else comes up... maybe I'll just buy another one... )