Tap and Die question

[Kenskip1]

About a month ago I received my Astro tap and die set. (Metric) My question is, does the metric tap and die have a course and fine thread? I find this perplexing as I am now looking for a standard and most sets have a fine and course set of both taps and dies.

Can anyone explain to me why Astro standard tap and die sets only have the taps? How about it Chris?Thanks, Ken

 

[PartsGuy27]

Yes a complete set of metric taps contains both coarse and fine threads.

 

[DFB]

Yes metric also has different thread pitch per inch on the same size fastener, normally two but there are also some others but not so common to most end users,.

Why your kit was configured the way it was...well some trades or specific aplications only need/want the taps for threading holes.

If you needed dies too...oh well should had thought of that sooner

 

[Kenskip1]

Well the Astro set 7582 is the set that I purchased. I am sure that there are some happy owners however, I am not one of them. This was my mistake and I will not bite on this again.HF has the set that I should have purchased.It has like 20 taps and 20 dies. 10 course and 10 fine thread.Same for the dies.Anyway like I said, this was my screw up.Live and learn. Ken

 

[DFB]

Well the Astro set 7582 is the set that I purchased. I am sure that there are some happy owners however, I am not one of them. This was my mistake and I will not bite on this again.HF has the set that I should have purchased.It has like 20 taps and 20 dies. 10 course and 10 fine thread.Same for the dies.Anyway like I said, this was my screw up.Live and learn. Ken

Well don't consider it a screw up (more so maybe just a learning curve) but even if you buy a complete set never hurts to have duplicate taps on hand especially in the most common sizes...

 

[M6erfan]

You bought an Automotive set. The taps and dies sizes are fine for that purpose.

 

[mbshop]

Yea, not really set up as rough or fine in the description. Doesn't work that way. What you get are common thread pitches. So as mentioned, you got a common automotive metric set. I doubt you will find much of anything not in the kit. Same thing applies to standard sizes and kits. If you want more size options then I suggest buying them individually. I had a big set that had two dies and three taps for each size and had sizes I never heard of. But I needed it for working on Mercedes buses. So what sizes are you actually looking for ? Again, the terms rough and fine do not apply.

 

[matt_i]

One has to consider the utility of fine threads in either system. To get the proper use out of it the base material (internal thread) typically needs to be hardened in some way. Otherwise the small/short thread crests just strip out before the potentially higher clampload can be achieved.

A metric thread is already finer than its SAE counterpart. Consider 1/4-20 and M6 x 1.0...the -20 tpi is .050" pitch while the 1.0mm pitch equates roughly to .040". It seems infintessimal being only .010" difference but its a 20% change...

What does it mean for me? I'd buy metric fines 1 at a time because they are so rare.

 

[6PTsocket]

Well the Astro set 7582 is the set that I purchased. I am sure that there are some happy owners however, I am not one of them. This was my mistake and I will not bite on this again.HF has the set that I should have purchased.It has like 20 taps and 20 dies. 10 course and 10 fine thread.Same for the dies.Anyway like I said, this was my screw up.Live and learn. Ken

The astro set may not have every size you want but it is good quality. Fill in if necessary. The HF sets are garbage unless you are tapping plastic. The handles are junk, too. If you don't see the difference, by all means buy the HF set and find out the hard way.

Sent from my SM-G900V using Tapatalk

 

[bobcatdan]

I have found that unless you work on Asian equipment like small diesel engines, forklifts or compact tractors. I have yet to find the finer thread metric eleswhere.

 

[plinker]

I have found that unless you work on Asian equipment like small diesel engines, forklifts or compact tractors. I have yet to find the finer thread metric eleswhere.

This has been my experience with automotive repair. 10-1.00 & 12-1.25 are common on Toyota, Honda, Subaru, ete....

 

[CJM8515]

you really dont need much when it comes to metric. There are only so many common sizes.



FWIW my HF cheapo set doest just fine, havent ever had an issue.

 

[larry_g]

https://www.mscdirect.com/browse/tn/Threading/Tap-Sets?searchterm=metric+tap&navid=4287923552

Above is the first of 4 pages of hand taps in metric. What sizes do you need. Do you expect all these in a kit?

lg
no neat sig line

 

[notlob]

Is this the kit you bought?

https://www.amazon.com/Astro-Pneumatic-Tool-7582-Automotive/dp/B01JBNGZM8

If so, did you not know what the kit contained before you ordered it? BTW, IMO, HF taps and dies are never a good choice.

Astro Pneumatic Tool 7582 Metric Automotive Tap & Die Set

 

[6PTsocket]

Then again if you are tapping new holes and not using them as a poor substitution for a chaser tap, you should have the taper plug and bottoming taps for each size. The 3 taps are often sold as a package. There are even complete sets with case, pilot drills and handles but usually without dies.

Sent from my SM-G900V using Tapatalk

 

[Astro_Pneumatic_Tools]

The sizes in the set were determined by GJ
It's strickly automotive sizes

https://www.garagejournal.com/forum/showthread.php?t=336475&page=4


Contractually, we can't make huge sets with all sizes as we already do so exclusively for other brands - and this was a way to keep quality high without it costing a lot.

 

[Steve_P]

Deleted....

Edit- ok, I looked and that kit is fine for 99% I'm not sure what the issue is

 

[d.mcfarland]

I'm curious what Ken is so disgruntled about?

I was considering getting this set and it seems like a lot of people have not had any issues with it.

 

[theoldwizard1]

Contractually, we can't make huge sets with all sizes as we already do so exclusively for other brands ...

Any hints on brand ?

 

[Kenskip1]

I was expecting the metric set but with both fine and coarse taps and dies. What I ended up with was a metric automotive set.Nine taps and dies.I should have done more homework prior to my purchase.Ken

 

[Dave455]

Ken - ISO metric standards do have coarse and fine threads, but they are very different to their imperial equivalents.

A metric coarse thread would be, for example, 5mm x .8. This is a much finer pitch than a unified coarse of similar size. In fact it’s comparable to a UNF, and designed for a similar purpose (steel bolt and steel nut).

Metric fine threads are much finer than their unified equivalents, and tend to be for specialist applications. I do have a set that includes both metric coarse and fine, but don’t think I have ever used the fine, and certainly not on a vehicle!