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Q7 Tapered Button Bit (7 Teeth) for Hard Rock Drilling
Feature: High Wear Resistance & Long Service Life.
Button Configuration: 7 Tungsten Carbide Buttons.
Bit Diameter: 32mm - 45mm.
Taper Degree: 7°, 11°, 12°.
Application: Hard rock mining (Granite/Basalt).
- Technical Specifications
Q7 Tapered Button Bit (7 Teeth): The Specialist for Hard & Abrasive Rock
The Q7 Tapered Button Bit (7 Teeth) is specifically designed for hard and abrasive rock formations. With 7 premium tungsten carbide buttons, it offers more contact points than standard 5 or 6-button bits, ensuring smoother operation and significantly longer service life in granite and basalt mining.
As a leading rock tools exporter, Topking uses special heat treatment technology to prevent button breakage. The Q7 model is your best choice when durability and penetration speed must be balanced.
💡 Hard Rock Solution: Drill & Crack
Expert Tip: After drilling with Q7 bits, use Topking Expansive Mortar (HSCA) to crack the hard rock silently. It's safer and more efficient than explosives in sensitive areas.
Advanced Technology: Optimized Asymmetric Layout
The Q7 bit utilizes an optimized asymmetric carbide placement. This technical design reduces the "anti-drilling" resistance in homogenous hard rock, ensuring the drill bit doesn't strike the same spot repeatedly. This leads to 10-15% higher advance rates in granite roadway drifting compared to standard layouts.
Selection Guide: Q7 vs. Q6 vs. Q8
| Feature | Q7 (High Advance) | Q6 (Balanced) | Q8 (Max Life) |
|---|---|---|---|
| Hard Rock Efficiency | Excellent | Good | Standard |
| Wear Resistance | High | Medium | Highest |
| Best Drill Match | YT28 / YT29A | YT27 / YT28 | High Pressure Rigs |
Product Specifications:
Button Configuration: 7 Buttons (High Wear Resistance)
Bit Diameter: 32mm - 48mm
Taper Degree: 4°46’, 6°, 7°, 11°, 12°
Connection Shank: Hex 19mm, Hex 22mm, Hex 25mm
Skirt Type: Normal Skirt / Long Skirt
TAPER DRILL BIT SIZES & CHARTS
Q7 Tapered Button Bit FAQs & Technical Support
Q1: Why is the Q7 7-button bit better for project speed than the Q8?
A: The Q7’s asymmetric layout provides slightly lower resistance than 8-button models. This allows for higher impact energy transmission directly into the rock face. You get a faster penetration rate in hard rock while maintaining much higher durability than standard 5 or 6-button bits.
Q2: How does the Q7 perform in highly abrasive rock like granite?
A: It excels in abrasive conditions. Our specialized forged alloy steel body combined with premium tungsten carbide buttons is heat-treated to resist the intense thermal stress of drilling granite (f=15+). This prevents premature button pop-outs and body wear.
Q3: Which taper degree is best for heavy air-leg drills like YT28 or YT29A?
A: For high-power machines delivering massive impact energy, we strongly recommend 11-degree or 12-degree tapered bits. These wider angles ensure the most secure connection between the drill bit and the rod, preventing slipping or jamming under heavy pneumatic loads.
Q4: What is the technical advantage of the Q7's asymmetric carbide placement?
A: The non-symmetrical layout ensures the carbide buttons do not strike the exact same spot in the rotation cycle. This effectively reduces "tracking" and allows the bit to constantly crush fresh rock, leading to 10-15% higher advance rates in hard rock tunneling and mining.
Q5: How can I extend the lifespan of my Q7 tapered button bits?
A: Regular maintenance is key. Once the "flat top" wear on the buttons reaches 1/3 of the original diameter, we recommend re-sharpening them using a diamond grinding cup. This restores the spherical profile and prevents excessive vibration that could snap the drill rods.
Q6: Are Expandag Q7 bits compatible with international drill rod brands?
A: Yes. Our Q7 bits are precision-manufactured to match global industrial standards. They are 100% compatible with tapered drill rods from brands like Atlas Copco, Sandvik, and other major manufacturers using standard 7°, 11°, and 12° taper configurations.
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