Regal Cutting Tools 0813N71S Metric Plug Tap 4 Flute

Regal Cutting Tools’ metric plug tap for internal threads is sized M12 x 1.75 and features a 4‑flute design. The tool is made from high-speed steel with a bright/uncoated finish and is suitable for both hand tapping with a tap wrench or machine tapping when used with the appropriate holder. Regal’s metric data lists this size with a D6 thread limit and a six‑inch overall length, including a 1‑21/32‑inch thread length. The shank diameter is about 0.367 inches, aligning with Regal’s metric tapping standards. In plug‑tap configurations, the cutting action begins with a tapered lead to start the thread and then cuts with the remaining flutes to complete the profile.