3 Carbide Bullet Teeth Quality Differences That Affect Your Drilling Cost per Meter

Two B47K carbide bullet teeth. Same shape, same size, both labeled “carbide tip.” You cannot tell them apart by looking. But one drills 80 meters of hard sandstone before it needs changing. The other chips and breaks at 10 meters.

The shape is not the problem. The problem is three things most suppliers never show you — things hidden inside the tooth, hidden in the factory, hidden behind the price tag. These three gaps decide if your project finishes on budget or bleeds money.

Gap 1 — Virgin Carbide vs. Recycled Carbide

The carbide tip does all the cutting. If the tip is bad, nothing else matters.

Virgin carbide is made from pure tungsten and cobalt powder, heated under tight control. The result: dense, hard, consistent. Hardness stays between 86–88 HRA, wear is predictable.

Recycled carbide is the opposite. It comes from melting down old scrap — used tips, worn tools, factory waste. Impurities sneak in, grain size is uneven, hardness swings from batch to batch. It looks fine on day one. Then you hit a hard layer and it chips, cracks, or falls off.

You cannot tell virgin from recycled by eye. The only way to verify is a hardness test and lab report. If your supplier cannot give you a report, assume they did not test.

Gap 2 — Brazing: Why Tips Fall Off Mid-Drill

A good carbide tip means nothing if it is not welded onto the steel body properly. The weld — called brazing — is what holds the tip under tons of pressure. This is where small workshops cut corners.

Cheap suppliers use a hand torch. One worker, one flame, one tooth at a time. The heat is never the same. Often you get a “false weld” — looks solid, but under drilling load the tip snaps off. Now you have a bare steel stub grinding against rock, damaging your auger and the carbide bullet teeth around it.

FES uses automatic welding. Every tooth gets the same heat, the same bond. Then every batch goes through flaw detection. Bad teeth never leave the factory.

Gap 3 — Wear Protection: 40 Meters vs. 80 Meters

Standard carbide auger teeth leave the steel body bare. In abrasive ground — sand, gravel, weathered rock — the steel wears down faster than the carbide tip. The tip loses support and drops out. Your tooth is done at 40 meters.

FES rock auger bullet teeth offer extra wear protection:

• Carbide strips on the body — suitable for sand-rich formations.
• Carbide beads + tungsten carbide tip — for hard rock up to 120 MPa
• Heavy wear-resistant coating — for sandy cobble layers

These protections shield the steel from direct contact with rock. Same ground, same tooth design — but 80+ meters instead of 40. Double the distance before you need auger teeth replacement.

How FES Checks Quality — What Others Skip

We did a comparison test of B47K teeth between FES and one international brand by a third party testing institute, and the test report is available upon request. The results show the quality of FES teeth is comparable with the teeth of the international brand— however our price and delivery time could be more competitive.

On a construction site drilling Ø1080 mm holes in rock, a customer compared FES replacement teeth against another famous company’s OEM teeth. His feedback was clear: “No difference in cutting performance and lifetime could be determined.” — Klaus

Every batch goes through three checks:

• Hardness test- verifying carbide tip hardness reaches 86–88 HRA, confirming virgin carbide quality
• XRD crystal phase analysis| verifying heat treatment quality and detecting internal material defects
• Dimensional inspection-measuring tip angle, tail diameter, and overall length to ensure proper fit in your auger

If your supplier cannot give you a test report, they are asking you to trust them with your timeline and budget. You do not need that risk.

Price Per Tooth vs. Cost Per Meter — The Real Math

A recycled-carbide tooth costs $3–5 less per piece. For 20 teeth, that looks like $60–100 saved. It feels smart at the time.

Now look at 500 meters of medium rock:

• • Cheap teeth: 30+ stops to change broken teeth. Each stop costs $120–180/hour in downtime.
• • FES virgin carbide teeth: 7–10 changes. Far fewer stops.

That $60–100 “saved” turns into $3,000–5,000 in real costs — downtime, extra labor, wasted teeth, even damage to your auger. You pay for quality once. You pay for cheap teeth every day you drill.

Frequently Asked Questions

Q: How do I know if it is virgin carbide?

A: You cannot tell by looking. Virgin and recycled carbide look the same. Ask your supplier for a batch hardness report. No report = no testing.

Q: What is the difference between B47K and C31HD?

A: B47K is heavy-duty with 17.5–30mm tips, for medium to hard rock up to 120 MPa. C31HD has a smaller 12mm tip, made for soft rock and faster drilling.

Q: How often should I replace carbide bullet teeth?

A: No fixed schedule — it depends on your ground. Check after every shift. Replace when the tip is flat, chipped, or penetration rate drops. Good virgin carbide teeth last 40–80+ meters in medium rock.

Q: Do FES teeth fit all auger brands?

A: B47K-style uses a standard 30mm tail. Fits SANY, Zoomlion, XCMG, Bauer, Soilmec, and most major brands. Custom sizes available.

Q: What is the lead time?

A: Stock items ship in 3–5 days. Custom or large orders take 15–30 days.

Looking for auger teeth for sale that actually last? FES uses automated production, and full batch testing. Request a quote →