The HSSE machine reamers with parallel shank and centesimal diameter progression are precision tools designed for finishing pre-machined holes on machine tools. They are suitable when the hole must be brought to final size with dimensional control, good surface quality and repeatable machining results. The centesimal progression allows the most suitable diameter to be selected according to the required final size, making the tool ideal for applications where hole accuracy is essential.

Manufacture according to DIN 212 / UNI 6853 identifies this type of machine reamer with parallel shank as suitable for use on drills, milling machines, machining centres, lathes and compatible machine tools. The parallel shank allows clamping in suitable chucks or tool holders, providing practical mounting and good stability during machining, provided that the machine-tool holder-workpiece system is correctly aligned and rigid.

The HSSE material provides good wear resistance and stable cutting performance in professional machining operations. It is suitable for workshops, industrial production, mechanical maintenance and departments where the tool must maintain consistent performance over time. Correct use of the reamer improves hole geometry compared with preliminary drilling alone, producing a more accurate diameter and a more regular internal surface.

The left-hand helix 6° cutting edges, form B-D, support controlled machining and good chip evacuation depending on hole type and material being processed. The reamer must be used on an already prepared hole with suitable and uniform machining allowance. Correct pre-hole preparation is essential to avoid vibration, scoring, ovality, premature tool wear and inconsistent dimensional results.

During use, correct clamping of the parallel shank, tool alignment with the hole and workpiece stability should be checked. Suitable cutting parameters, regular feed and correct lubrication or coolant use help improve surface finish, reduce friction and maintain a stable machined diameter. The reamer should not be used for excessive material removal, but to complete the machining operation by bringing the hole to final size.

These reamers are suitable for finishing holes in mechanical components, fitting seats, assembly parts, precision elements, tooling and series-produced workpieces. They are useful in CNC and conventional machining where precise and repeatable holes are required, reducing dimensional errors and improving the internal quality of the machined surface.

For good results, it is advisable to select the correct centesimal diameter according to the required final size, prepare the hole with the proper allowance, avoid misalignment and regularly check the condition of the cutting edges. Progressive and well-lubricated machining helps improve tool life and maintain consistent hole quality.

The DIN 212 / UNI 6853 HSSE machine reamers with parallel shank are therefore a technical solution for precise and reliable finishing operations. The combination of centesimal diameter progression, parallel shank, HSSE material, left-hand helix 6° form B-D and machine tool application makes them suitable for mechanical workshops, production departments and industrial applications requiring dimensional control, stability and hole quality.