Introduction
High-Speed Steel (HSS) DIN338 drill bits are widely used across metalworking, woodworking, and construction industries due to their balance of toughness and versatility. However, like any cutting tool, they wear down over time — especially if misused or pushed beyond their limits.
This article provides practical and proven techniques to extend the lifespan of your HSS DIN338 drill bits, helping you reduce tool replacement costs, improve drilling efficiency, and ensure cleaner, more precise holes in every application.
Whether you're a distributor, fabricator, or end user, these insights will help you get more out of your tooling investment.
Not all materials are the same, and using a general-purpose bit on hardened steel or stainless can lead to premature wear or even tool breakage.
Recommendation:
Use TiN-coated DIN338 drill bits for hard metals like stainless steel.
Opt for black oxide-coated bits for mild steel and wood.
Uncoated bits are better suited for soft materials like plastics and aluminum.
Explore our full range of coated and uncoated HSS DIN338 drill bits →
Heat buildup is the main enemy of drill bits. Excessive temperature softens the cutting edge and accelerates wear. Using the appropriate cutting fluid or lubricant can significantly extend tool life.
Tips:
For metals like steel or iron, use cutting oil or coolant.
For aluminum, use specialized aluminum-compatible lubricants to prevent chip welding.
Avoid dry drilling unless the bit is designed for it.
According to Machinery's Handbook, appropriate lubrication can extend bit life by 30-100%, depending on material and drilling speed.
Over-speeding or applying too much pressure can dull or even snap HSS drill bits. Manufacturers typically provide speed and feed charts — following these helps protect your tools.
General Guide:
| Material | Recommended RPM (Ø6mm) |
|---|---|
| Mild Steel | 1,200 – 1,500 |
| Stainless Steel | 500 – 800 |
| Aluminum | 2,000 – 3,000 |
| Plastic | 1,500 – 2,000 |
Always reduce speed when using larger diameter bits. Use a drill press or CNC for more consistent results.
Even high-quality HSS bits lose their edge over time. Dull bits generate heat and require more pressure, increasing the chance of damage.
Best Practices:
Regularly inspect bits for wear.
Use a dedicated drill bit sharpener or send to a professional sharpening service.
Replace bits if chips, cracks, or heavy wear is visible.
Tip: Sharpening is especially cost-effective for uncoated HSS bits that can be reused multiple times.
Chip clogging in the flute can cause overheating and bit breakage. This is especially common when drilling deep holes.
Solutions:
Use peck drilling: drill a short depth, retract to clear chips, and continue.
Use a compressed air blast or coolant-through system (if available).
Avoid forcing the drill; let it cut naturally.
Wobble or misalignment increases runout and stresses the drill bit unevenly, causing premature wear.
Tips:
Use high-quality drill chucks or collets.
Check for spindle runout before machining.
Use a center punch to help the bit start accurately on metal surfaces.
Proper storage prevents corrosion and accidental tip damage.
Storage Tips:
Use individual bit holders or index boxes.
Keep away from moisture and humidity.
Wipe down with a light oil coating if storing long-term.
Coatings like TiN (Titanium Nitride) or TiAlN provide thermal stability and surface hardness, making them ideal for heavy-duty operations.
Browse TiN-Coated HSS DIN338 Drill Bits →
Extending the life of HSS DIN338 drill bits is about more than just using them carefully — it's about choosing the right bit, pairing it with the right speed, and maintaining it properly.
By applying the techniques above, you can:
Cut operational costs
Improve drilling quality
Reduce downtime due to tool failure
For wholesale inquiries, bulk orders, or custom packaging, contact our team — we’ll help you select the best HSS DIN338 solution for your application.
Contact our experts today for a free quote or technical consultation.