Best Metalworking & Multipurpose Drill Bits AI pick
Chosen by an AI model from its trained knowledge, with its reasoning.
AI pick (line): Chicago-Latrobe 150 Series
These are US-made HSS jobber drills with consistent geometry and true sizing, and they are the standard individual replacement bit for general metalworking.
Not for: People drilling mostly stainless or hardened steel, who need cobalt or carbide instead of plain HSS.
AI picks by need
For stainless and tough alloys
Guhring (brand)
Guhring's cobalt and coated jobbers hold an edge in work-hardening alloys where plain HSS dulls fast.
Not for: Casual hand-drill users in mild steel, for whom this is overkill.
What the AI looks for in Metalworking & Multipurpose Drill Bits
- Material
- HSS for mild steel, aluminum and wood; M35/M42 cobalt for stainless and tough alloys; solid carbide only in rigid machines Matching the substrate to the workpiece matters more than the coating.
- Point angle
- 118° for general and soft materials; 135° split point for hard materials and hand drilling A split point self-centers without a center punch and cuts with less thrust.
- Length
- Use the shortest length that reaches: stub (screw machine), then jobber, then taper or aircraft length A shorter bit flexes less and wanders less, which gives truer holes and fewer breaks.
- Coating
- Black oxide or bright finish is fine for general use; TiN and TiAlN help mostly at machine feeds and speeds Coatings wear off on resharpening and do not rescue a poor substrate.
Brands that matter
- Chicago-Latrobe: Reliable US-made industrial HSS and cobalt drills.
- Guhring: German premium drills, strong in cobalt and carbide.
- Precision Twist Drill: Industrial HSS drills across many lengths.
- Cleveland Twist Drill: Long-standing industrial drill brand.
- Drill America: Value-oriented industrial drill bits and sets.
What to avoid
- Unbranded titanium-coated bits sold as titanium drills
- Bits without a stated substrate (HSS or cobalt)
- Running at wood speeds in steel, which burns the edge
Questions
Is titanium coating better than cobalt?
No. Titanium bits are usually HSS with a thin coating, while cobalt is alloyed through the steel and survives sharpening.