When the challenge is tapping of ultra-hard materials (hardness higher than 55 HRC), we recommend using the UH-CT carbide taps.

Chamfer length of EH-CT taps is 5 threads: set the depth of the bored hole deeper than the chamfer length of the tap.Pay attention: if the tap starts to reverse when the chips are accumulated at the bottom of the bored hole, the chamfered threads of EH-CT tap may be chipped.

We are a leading manufacturer of custom carbide cutting tools: carbide drilling inserts, carbide milling inserts, and carbide threading inserts.

The tip diameter of EH-CT taps is designed to be as close to the maximum minor diameter of the 6H internal threads as possible and it is larger than standard tips. Note that if the internal thread class is specified as “6H or class 2”, make sure to drill the bored hole as close to the maximum minor diameter of the thread tolerance as possible.To learn more about the importance of bored hole size, read this tech tip.

What constitutes a special insert or cutting tool? Geometry? Grade of material? Forms? Finish requirements? Tolerance? It could be any of these, generally speaking, and if a desired product is not found in a local suppliers catalog or even if it’s in the catalog, just not to your specifications then it’s a special, and we can help.

Yamawa taps for the mold & die industry are a reliable solution for obtaining high quality thread surfaces in a wide range of hard and ultra-hard materials typical of this market.The best choice in carbide hand taps for high hardness steel is EH-CT taps which are especially designed for tapping materials in the range 45 to 55 HRC such as high alloy steels (95 MnWCr 5 KU), hardened tool steels (X 155 CrVMo12 1 KU), and tool steels (X 40 CrMo 5 1 1 KU). They can be used with machining centers with synchronous feed systems.

Custom grinding and re-grinding and/or resizing of carbide, ceramic, cermet and some HSS indexable inserts. Inserts are ground to a “C” or “G” tolerance on both periphery and thickness. Services also include edge preparation such as t-landing and/or honing, re-coating to original specifications or custom requirements. Special geometry threading & grooving inserts also available.

Taps specifically designed for difficult-to-machine materials such as stainless steel and heat-resistant super-alloys occupy a…

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