EFFICERE 40-Piece Premium Tap and Die Set - SAE Inch Size 1/2, 7/16, 3/8, 5/16, 1/4, 12, 10, 8, 6, 4, Coarse and Fine Teeth | Essential Threading Tool Kit with Complete Handles, Accessories, and Case

I needed to cut some 6-32 threads in some stainless steel rods used to secure engine baffles underneath the engine for a Vans RV-9 Home-built Aircraft. I tried to make the threads with my Harbor Freight die that is made of carbon steel but it would not even scratch the surface of the stainless rods. I needed a much harder die that could cut stainless steel. I did some research and found that high quality dies that are made of Cobalt Steel, Titanium Steel, or High Speed Steel (HHS) could cut stainless. I happened to find this set and the product description said it is made of GCr15 Bearing Steel hardened to Rockwell 60 and could cut stainless. I didn't know what GCr15 steel was but I found the following definition online: GCr15 steel is one of the most commonly used Chinese bearing steels, it’s a high carbon chromium bearing steel with high hardenability, high & uniform hardness after heat treatment. I also looked up the rockwell 60 number which is based on a standard hardness scale that goes up to 62 so 60 is at the top of the range when it comes to hard steel. I was still a little skeptical since the price of this set was very low compared to other sets or individual dies I could find for cutting stainless. I decided to take a chance and try this set out since it had lots of good reviews saying the taps and dies in this set seemed to work well for most everyone who bought them and also several good comments about the customer service willing to refund customers who had any dissatisfaction with the product. My set arrived from Amazon in 2 days from ordering. I tried them out over the weekend and they cut very nice accurate threads in my stainless steel rods very easily while using a couple drops of tap magic oil. This set performs as advertised, it is made of industrial quality steel that can cut stainless steel. The other reviews also said the handles the set comes with are lower quality but I would say the handles are comparable to the ones that come in a Harbor Freight set. I also found on Amazon a very handy 5 piece set of GearWrench ratcheting handles for taps and dies that fit perfectly with this set and made the job easy. For the money, I don't think there is anything out there that compares to the quality of the steel in this set for cutting hard material.

Fast delivery Good quality Reliable

箱は各ピースがはまり込む構造ではなく、閉めても傾けると中身がバラバラになる。 タップを健康なネジ穴に通すとソコソコの抵抗があり、切り粉も出てきた。ダイスも切れ味がイマイチ。不具合にまでは至らないのでまあ良しとする

This is amazing - great quality

Great kit