HM OR HSS CUTTER? A SELECTION GUIDE FOR PROFESSIONAL METAL DRILLING.
HM or HSS cutter? A guide to choosing for professional metal drilling.
In the world of professional drilling, choosing the right tool can make the difference between a precise job and one that needs to be redone.
HSS (high-speed steel) core drills are economical, versatile, and ideal for soft to medium-grade materials. But when it comes to alloy steel, stainless steel, or thick structures , carbide (HM) comes into play.
HM or HSS: what really makes a difference?
Here's a quick comparison of the two options to help you make an informed choice.
1. Material and structure
| Characteristic | HSS (High Speed Steel) | HM (Tungsten Carbide) |
|---|---|---|
| Composition | Steel alloys with molybdenum, vanadium, chromium | Sintered carbide powders with metal binders |
| Hardness | Up to 64 HRC | Over 90 HRC |
| Tenacity | High (shock resistant) | Lower (more fragile, but very hard) |
| Heat resistance | Up to 600°C | Up to 1000°C |
Summary: HM is harder and more heat-resistant, but less tough. HSS is more flexible and more tolerant of setting errors.
2. Cutting performance
| I wait | HSS | HM |
|---|---|---|
| Cutting speed | Average | High |
| Tool life | Average | Very long |
| Surface finish | Good | Excellent |
| Resharpenability | Easy | Difficult or unexpected |
Technical note: HM cutters maintain their cutting edge even on alloyed steels and stainless steels; HSS cutters require constant lubrication and cooling.
3. Recommended applications
| Type of processing | HSS | HM ULTRA 35 FEIN |
|---|---|---|
| Soft metals (aluminum) | ✅ | ✅ (minor advantage) |
| Mild steel | ✅ | ✅ |
| Alloy steel / stainless steel | ⚠️ (only with lubrication) | ✅ (constant performance) |
| Structural carpentry | ⚠️ | ✅ |
| Intensive production | ❌ | ✅ |
Discover the complete HM ULTRA 35 FEIN range and choose the perfect size for your job:
4. Practical tips for use
- Always use cutting lubricant appropriate for the material.
- Set the rotation speed according to the manufacturer's tables.
- Check the compatibility of the attachment (QuickIN or Weldon).
- Apply constant pressure and let the tool do the work.
5. Cost and performance
| Factor | HSS | HM ULTRA 35 FEIN |
|---|---|---|
| Unit price | Bass | Medium/High |
| Cost per hole | High (rapid wear) | Low (high duration) |
| ROI (return on investment) | Good for light work | Excellent for industrial production |
Economic analysis: If you drill a few holes in soft materials, HSS is sufficient. If you work on steel every day, HM reduces time, downtime, and tool wear.
Why choose HM ULTRA 35 FEIN
FEIN HM ULTRA 35 cutters are made of tungsten carbide, an extremely hard and wear-resistant material. This results in:
- Faster cutting.
- Longer life.
- Less overheating.
- Consistent performance even on difficult materials.
When is it best to use HM ULTRA 35 FEIN?
Choose them if you work with:
- Structural steel.
- Stainless steel.
- Alloyed or tempered materials.
- Thicknesses greater than 10 mm.
The range is available in diameters from 14 to 60 mm , cutting depth of 35 mm , QuickIN attachment for quick tool changes and compatibility with FEIN KBM/KBU/AKBU machines.
Discover the complete HM ULTRA 35 FEIN range:
Ready to improve your speed and accuracy?
Do you want to reduce drilling times and increase precision?
Switch to the FEIN HM ULTRA 35 range. Available now on Dinamitek, with all the technical advice you need.
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