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.
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.
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.
| 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 |
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
Q: Why is the Q7 7-button bit better for project speed than Q8?
A: The Q7 asymmetric layout provides slightly less resistance than 8-button models. This allows for higher impact transmission into hard rock, resulting in a faster penetration rate while still maintaining high durability.
Q: How does Q7 perform in abrasive rock like granite?
A: It excels. Our special heat-treatment process ensures the forged steel body and carbide tips resist the intense thermal and mechanical stress of drilling abrasive formations (f=15+).
Q: Which taper degree is best for heavy air-leg drills?
A: For high-power machines like YT28 or YT29A, we recommend 11-degree or 12-degree tapered bits to ensure the most secure connection under massive impact.
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