Sada vrtákov Bosch HSS kovový špirálový 7,6 mm, celková dĺžka 117 mm, brúsený, DIN 338, valcová stopka, 10 kusov

Set of 10 Bosch HSS spiral drill bits for metal, 7.6 mm diameter and 117 mm overall length, ground to DIN 338 standard with a cylindrical shank. These high-speed steel (HSS) bits are designed for machining steel and various other metals. The ground spiral flutes ensure accurate cutting geometry and improved concentricity, while the cylinder shank provides secure mounting in standard drill chucks and straightforward tool changes in workshop and construction environments.

Advantages

Ground to DIN 338 tolerances, these drills deliver consistent hole quality and repeatable diameters, reducing the need for rework. The HSS material offers a balance of hardness and toughness for reliable performance when drilling metal. The spiral flute design efficiently evacuates chips, decreasing heat buildup and helping to extend tool life. A straight cylindrical shank allows use in a wide range of hand drills and drill presses without special adapters.

Suitable for

Key specifications

How to use

Select the appropriate drill speed and feed rate for the metal being drilled; lower speeds are recommended for harder steels. Secure the workpiece and clamp it to prevent movement. Mount the cylindrical shank firmly in the drill chuck and ensure concentric running before starting. Apply steady, even pressure during drilling and periodically retract to clear chips if necessary. Use cutting lubricant or cooling fluid when drilling thicker sections or harder materials to reduce heat and prolong tool life.

Recommendations

For best results, match drill speed and lubricant to the material type: moderate speeds and cutting oil for mild steel, slower speeds and increased cooling for hardened or alloyed steels. Inspect drill tips for wear and replace when edge rounding or excessive chipping appears to maintain hole quality.