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What is the special tap for thread sheath? What is the special tap for thread sheath? The special tap for thread sheath is a non-standard tap. Generally, it can only be used to process the internal thread bottom hole when installing the thread sheath. The special bottom hole tap for thread sheath is used to process the special internal thread of the screw sleeve installation hole. The structural size is consistent with the national general tap standard. The working size is specially designed and