Metal Drill Bits – How to Choose the Right Bit for Every Task

Drill bit material types

HSS drill bits (High Speed Steel) are the standard for drilling steel and aluminum, while cobalt bits withstand extreme temperatures when working with stainless steel. Carbide bits like TESTERA ZA BUŠENJE OTVORA O30mm offer the highest hardness and longevity on hard alloys, but require more precise control of speed and pressure.

BOSCH and HARDEN – reliability and precision

BOSCH drill bits feature precise tip geometry that reduces slipping at the start of drilling. HARDEN series offer excellent price-to-quality ratio, with TiN coating that extends tool life and reduces friction when working with harder metals.

Metal burrs – specialized machining

Burrs like GLODALO ZA METAL CILINDRICNO and GLODALO ZA METAL KUGLASTO enable precise machining of grooves, profiles and contours. Ball-shaped burrs are ideal for rounded surfaces and engraving, while straight and cylindrical burrs serve for enlarging holes and machining slots.

Choosing the right bit for the material

For mild steel use HSS bits with a 118° tip angle, while stainless steel requires cobalt bits with a 135° angle and slower speeds. Aluminum requires sharp bits with large spiral flutes for efficient removal of chips that tend to stick to the tool.

Hole saws for large diameter drilling

Carbide hole saws like TESTERA ZA BUŠENJE OTVORA O102mm are used for drilling large-diameter holes in thin-walled metal structures. Unlike regular drill bits, they allow drilling without pre-cutting or using a pilot bit, saving time on installation work.

What to check before buying

Verify the shank thread – standard is 6mm for hand drills, while professional tools often use 10mm or SDS system. KLINGSPOR and other quality manufacturers specify recommended speeds and material types on the packaging. Using excessive speed overheats the bit and accelerates wear, while too low RPM causes vibrations and imprecise drilling.

Selection and Pricing

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