The Best Places to Buy threading in lathe machine Online and In-Store
Apr. 28, 2025
Double End Internal External Threading HSS Tool Set for Lathe ...
Double End Internal External Threading HSS Tool Set for Lathe Machine (6 x 6 MM SHANK)
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Learn more how customers reviews work on AmazonWhat's your favorite threading/grooving tools | The Hobby-Machinist
I have used a number of different threading holders and also inserts, threading some fairly course deep threads. My experience with the vertical style carbide types using a Dorian tool holder was disappointing, and using a cheaper carbide brand (Cobra) threading inserts was far worse. I rarely would get a single thread out of them w/o getting a broken insert and as an overall cost was higher due to breaking, and not mention having to redo parts. I switched to lay down carbide inserts, and the difference was truly amazing. The quality of the thread was much better and I am still using the same Carmex insert for years. I only had to switch cutting points is because I banged a point a broke the tip. So from a cost point of view, $12 for an insert that lasts a long time is a no brainier. The other advantage is that should a point break, you can rotate to a new one and maintain the same geometry. Holder wise, it is a long term investment to buy a quality holder with the proper seat/angle, the cheap models omit this and also use one geometry fits all including for the inserts. It may work, haven't done direct comparison but I get excellent thread finish. I am using Carmex/Iscar holders and also there inserts. If you mess up one part or barrel, well the insert/tool cost can be inconsequential.
So a few things about lay down inserts/holders that make them more costly, technically there are separate holders and inserts for R/L and also internal and external threading. The inserts are labeled ER/EL and IR/IL. I primarily use the 16 AG60 type because they offer the widest range of threading from 48-8 TPI. Fine threading may be better dealt with using HSS. These are partial profile inserts, they have full profile but it can then add up, but may be worthwhile if you frequently do certain pitches. At the extremes of the TPI range, they usually recommend a different anvil under the insert to change the pitch angle.
As far as holders, I purchased the Carmex (Isacar) ones and at the time one was branded under a different name at 1/2 the list price. They work well and I do not see the need for using anything else. I originally bought 2 each carmex ER and IR inserts about 4 or 5 years ago and still using them. I also have a box of Mitsubishi ones, that I haven't tried yet. I have used these inserts on a wide range of metals and really surprised how well they have held up and perform. Down side with carbide is it is brittle if banged, and requires higher SFM. I typically am threading at 250-300 RPM in steel up to 1", 500-600 RPM in softer metals. A number of other people I know also use laydown inserts and have had a similar experience to me. Carmex inserts are often cheapest purchased directly through Carmex, but you need to look around at pricing.
This site has both threading holders ER and IR at very reasonable prices and also for the associated Carmex inserts is the lowest I have seen, would be my starting point without spending more. Carmex/Iscar holders are about 2X more, and there are a number of other mainstream holder manufactures that are similarly priced.
Unless I'm missing something I don't think carbide inserts are a good choice for use on "welded shafts". Things may have changed over the years, but my experience is that carbide doesn't like interrupted cuts. They have a tendency to chip, and essentially become useless. I would think threading or cutting through weldments would expose the tooling to a number of interruptions.
In your case I would think HSS inserts would be a better alternative. There are several brands and styles of insert tooling on the market, but like all insert tooling they're not cheap. Little Machine Shop offers a number of profiles for HSS inserts including internal and external threading tools.
Indexable Inserts - LittleMachineShop.com
As benmychree noted Aloris makes an HSS threading tool that only requires a light grinding on the top to restore the edge. I have an AXA model for my 10" lathe. I've used it going on 10 years, and there's still enough material to last at least as long again.
Aloris AXA # 8 Quick Change Threading Holder (ajaxtoolsupply.com)
If sharpening is a problem you might want to look into an Accu Finish Tool Sharpener. They made both a Series I machine and a Series II machine. Both are expensive if purchased new, but more reasonably priced when they do appear on eBay. It appears at least the Series II machine has been discontinued, so buying remaining new stock from dealers, or used from eBay, Craigslist, or other similar sources is about the only alternative. These machines take 99.9% of the guess work out of sharpening HSS tooling for threading. It's a simple matter of setting the scale to the proper angle, putting the tool in the fixture and making a couple passes across the wheel.
If you're really ambitious you can make your own tool or fixture for sharpening standard HSS blanks. I'm currently working on one for initial creation of, and resharpening threading and form tools. I used the original iteration to sharpen a number of threading tools ranging in size from 3/16" to 5/8". That version was only capable of threading tools, so it's being reworked to include form tools. I'm about 80% finished with the new model, but it's been moved to the back burner for lack of time, and the fact that it's more of a convenience than a necessity..
So a few things about lay down inserts/holders that make them more costly, technically there are separate holders and inserts for R/L and also internal and external threading. The inserts are labeled ER/EL and IR/IL. I primarily use the 16 AG60 type because they offer the widest range of threading from 48-8 TPI. Fine threading may be better dealt with using HSS. These are partial profile inserts, they have full profile but it can then add up, but may be worthwhile if you frequently do certain pitches. At the extremes of the TPI range, they usually recommend a different anvil under the insert to change the pitch angle.
As far as holders, I purchased the Carmex (Isacar) ones and at the time one was branded under a different name at 1/2 the list price. They work well and I do not see the need for using anything else. I originally bought 2 each carmex ER and IR inserts about 4 or 5 years ago and still using them. I also have a box of Mitsubishi ones, that I haven't tried yet. I have used these inserts on a wide range of metals and really surprised how well they have held up and perform. Down side with carbide is it is brittle if banged, and requires higher SFM. I typically am threading at 250-300 RPM in steel up to 1", 500-600 RPM in softer metals. A number of other people I know also use laydown inserts and have had a similar experience to me. Carmex inserts are often cheapest purchased directly through Carmex, but you need to look around at pricing.
This site has both threading holders ER and IR at very reasonable prices and also for the associated Carmex inserts is the lowest I have seen, would be my starting point without spending more. Carmex/Iscar holders are about 2X more, and there are a number of other mainstream holder manufactures that are similarly priced.
I’m going to get threading and grooving insert tooling for my recently acquired Clausing 15 lathe. Both external and a couple of internal bars as well. So far my tooling is what I’ve gleaned off the internet and what came with the machines as I bought them.
What style do y’all prefer? The lay down style or the edge type? What brands are preferred? Any decent foreign (China) made stuff? I don’t mind spending some bucks on quality, but certainly don't mind saving some bucks either!!!
I want carbide inserts ‘cause I can’t see good enough to grind HSS and,,,,, I frequently do rebuilding and am often dealing with welded up shafts.
Thanks
Tim
Unless I'm missing something I don't think carbide inserts are a good choice for use on "welded shafts". Things may have changed over the years, but my experience is that carbide doesn't like interrupted cuts. They have a tendency to chip, and essentially become useless. I would think threading or cutting through weldments would expose the tooling to a number of interruptions.
In your case I would think HSS inserts would be a better alternative. There are several brands and styles of insert tooling on the market, but like all insert tooling they're not cheap. Little Machine Shop offers a number of profiles for HSS inserts including internal and external threading tools.
Indexable Inserts - LittleMachineShop.com
As benmychree noted Aloris makes an HSS threading tool that only requires a light grinding on the top to restore the edge. I have an AXA model for my 10" lathe. I've used it going on 10 years, and there's still enough material to last at least as long again.
Aloris AXA # 8 Quick Change Threading Holder (ajaxtoolsupply.com)
If sharpening is a problem you might want to look into an Accu Finish Tool Sharpener. They made both a Series I machine and a Series II machine. Both are expensive if purchased new, but more reasonably priced when they do appear on eBay. It appears at least the Series II machine has been discontinued, so buying remaining new stock from dealers, or used from eBay, Craigslist, or other similar sources is about the only alternative. These machines take 99.9% of the guess work out of sharpening HSS tooling for threading. It's a simple matter of setting the scale to the proper angle, putting the tool in the fixture and making a couple passes across the wheel.
If you're really ambitious you can make your own tool or fixture for sharpening standard HSS blanks. I'm currently working on one for initial creation of, and resharpening threading and form tools. I used the original iteration to sharpen a number of threading tools ranging in size from 3/16" to 5/8". That version was only capable of threading tools, so it's being reworked to include form tools. I'm about 80% finished with the new model, but it's been moved to the back burner for lack of time, and the fact that it's more of a convenience than a necessity..