The HSS fixed hand reamers with parallel shank are precision tools designed for manual finishing of pre-machined holes. They are suitable when a hole must be brought to final size with good dimensional control, improved internal surface quality and a more accurate fit between mechanical components. Manual use allows the operator to directly control feed, pressure and tool stability during machining.

Manufacture according to DIN 206 / UNI 6852 identifies this type of hand reamer with parallel shank as suitable for fitting, maintenance, assembly and finishing operations on already prepared holes. The parallel shank allows stable handling with suitable tap wrenches or compatible manual tools, enabling controlled machining even outside the machine or on already assembled parts.

The HSS material provides good toughness, wear resistance and reliability in manual machining on different metallic materials. It is suitable for workshop use, mechanical maintenance, repair, toolmaking and operations where accurate finishing is required without necessarily using a machine tool. Reaming improves the hole compared with preliminary drilling alone, producing a more regular diameter and a more uniform internal surface.

The left-hand helix 6° cutting edges, form B, support progressive and controlled hole finishing. The reamer must be used on an already drilled hole with suitable and uniform machining allowance. Correct pre-hole preparation is essential to avoid excessive force, scoring, ovality, tool jamming and inconsistent dimensional results.

During use, the reamer should be kept correctly aligned with the hole axis, with regular feed and suitable lubrication according to the material being machined. The operation should be performed without forcing the tool, avoiding lateral movements that could affect cylindricity and hole accuracy. To preserve cutting quality, it is advisable to clean the cutting edges frequently and remove chips produced during the operation.

These reamers are suitable for finishing holes in mechanical components, fitting seats, bushings, plates, supports, tooling, maintenance parts and workpieces intended for assembly. They are particularly useful when manual corrections, adjustments or local finishing operations are required while maintaining good control of the final size.

For good results, it is advisable to select the correct diameter according to the required final size, prepare the hole with the proper allowance, use suitable lubricant and regularly check the condition of the cutting edges. The hand reamer should not be used to remove large amounts of material or correct major positional errors, but to complete the machining operation by bringing the hole to final size with precision and controlled finish.

The DIN 206 / UNI 6852 HSS fixed hand reamers with parallel shank are therefore a practical and reliable solution for manual finishing operations. The combination of parallel shank, HSS steel, left-hand helix 6° form B cutting edges and manual use makes them suitable for mechanical workshops, maintenance, assembly and applications requiring dimensional control, precision and hole quality.