1/2" Lathe Threading Tool External/Internal Threading Holder SER 1212H11+ SNL 0008K11 Threading Holder with 11ER AG60 11IR AG60 Threading Inserts (SER1212H11+SNL0008K11+11ER AG60)

Rugged and Solidly Constructed so they will hold the rigidity that is so important to good machining.

GREAT THREADERS

Use these to cut threads in barrels, usually a 4140 steel, and they work well.

The tool works well, but small cuts (five thou or less) are needed to avoid chipping the carbide insert tip.

I purchased these items for a friend that is a machinist and admitted that this definitely will make things a lot easier

The square tool holder is a solid 1/2in square using an 8mm threading insert. A little odd but ok for my use case. The internal threading bar is crazy small though. It can't be over 5/16in (8mm) in diameter. I'll have to make an adapter to hold it in my boring bar tool holder. Due to its length, it's unusable for anything other than shallow holes in soft metals; holes best suited for threading with a tap.

Like the title says, works as it should. Cuts lean threads.

Bought these as a test to see if they were at least the quality level of the Accusize cutting tools since they were less expensive, and looked identical in every way. In fact you could have thought they came off the same assembly line and packaged with two different labels. WELL, I can say with every bit of confidence, while the Accusize are, for a low cost cutting tool, good.... these Zouzmin cutting tools are not even worth their price. I use these 60 degree cutting tools to thread barrels. I have used the Zouzmin cutting tools on the last two barrels and it took two cutting tools each (using all 6 blades on the first and 5 on the second). They chip easily under the same pressures that Accusize would easily withstand. Lesson learned. Hope you are wise enough to heed these words.