Extra-Long Machine Reamer in HSSE Art. 231 with Custom Decimal Diameter – Cylindrical Shank h8, Left-Hand Helical Flutes 6°, for H7 Tolerance Holes

The extra-long machine reamer with cylindrical shank, made of high-quality HSSE (High-Speed Steel Extra), is specifically designed for producing H7 tolerance holes in ferrous materials, alloyed and mild steels, and light alloys. It is available with a custom decimal diameter, to meet the precise needs of high-accuracy machining and ensure full compliance with the most stringent dimensional specifications.

This precision tool features left-hand helical flutes with a 6° angle, a geometry that promotes controlled chip evacuation outward from the hole, minimizing vibration and ensuring excellent surface finish. The cylindrical shank ground to h8 tolerance guarantees a secure and precise grip in standard chucks and tool holders, improving concentricity and reducing the risk of misalignment during reaming.

Available in diameters ranging from 1.2 mm to 20.1 mm, this reamer can be supplied in extra-long lengths upon request, with custom production based on technical drawings also available.

Particularly suitable for use on CNC machines, machining centers, boring machines, and automatic lathes, this extra-long reamer is successfully employed in sectors such as automotive, aerospace, general precision engineering, mold making, and the manufacture of high-precision metal components. Its use enables the production of calibrated H7 tolerance holes with controlled roughness, even under demanding cutting conditions.

The extra-long reamer with custom decimal diameter represents a professional solution for all companies operating in the field of precision machining, who require reliable, durable, and high-performance tools