1. About Tapered Drill Bits

Tapered Drill Bits are designed for use with tapered drill rods in shallow-hole rock drilling applications. Through a precision taper-fit connection, impact energy generated by the rock drill is efficiently transferred through the drill rod to the drill bit and ultimately to the rock surface.

Tapered drill bits are widely used with hand-held and air-leg pneumatic rock drills such as YT24, YT27, YT28, YO20, and YN27. They are commonly applied in mining, quarrying, tunneling, construction, and blasting operations where economical and reliable shallow-hole drilling solutions are required.

Available in Button Bit, Cross Bit, and Chisel Bit designs, tapered drill bits can be supplied with taper angles of 4°46′, 6°, 7°, 11°, and 12° to match different drilling systems and regional market requirements.

Manufactured from premium alloy steel and high-quality tungsten carbide inserts, Qstone tapered drill bits provide excellent wear resistance, impact strength, and drilling performance in medium-hard to hard rock formations.

2.  Product Types

· Tapered Button Bits

Tapered button bits are the most widely used type of tapered drill bit. Equipped with spherical or ballistic tungsten carbide buttons, they offer higher drilling speed, longer service life, and improved performance in medium-hard to hard rock formations.

· Tapered Cross Bits

Tapered cross bits feature a cross-shaped carbide insert design, providing excellent guidance and stability during drilling. They are particularly suitable for fractured rock formations and applications requiring precise hole alignment.

· Tapered Chisel Bits

Tapered chisel bits are the most economical option for shallow-hole drilling. They are widely used in soft to medium-hard rock formations and are commonly applied in small mining operations, quarrying, and construction projects.

3. Tapered Drill Bits – Technical Specifications

4.Key Features

· Efficient Impact Energy Transfer

Precision taper-fit connection ensures maximum transmission of impact energy from the rock drill to the rock.

· Premium Tungsten Carbide Inserts

Manufactured with high-grade carbide for superior wear resistance and drilling performance.

· High-Quality Alloy Steel Body

Forged from premium alloy steel to provide excellent toughness and impact resistance.

· Multiple Bit Designs Available

Button Bits, Cross Bits, and Chisel Bits are available to suit different rock formations and drilling conditions.

· Multiple Taper Angles

Available in 4°46′, 6°, 7°, 11°, and 12° taper configurations.

· Cost-Effective Drilling Solution

Ideal for shallow-hole drilling applications requiring low operating costs and easy maintenance.

5. Applications

· Quarrying

Suitable for shallow blast-hole drilling in limestone, granite, marble, and aggregate quarries.

· Small-Scale Mining

Widely used in underground and surface mining operations with pneumatic rock drills.

· Construction & Blasting

Applied in road construction, foundation excavation, slope stabilization, and controlled blasting projects.

· Tunnel Development

Used for shallow-hole drilling during tunnel excavation, drift development, and underground construction projects.

6. Compatible Drill Rods

· Compatible with

· Taper Angles

7. Related Products

Tapered Drill Rods	Pneumatic Rock Drills	YN27C Gasoline Rock Drill	Integral Drill Rods

8. FAQ

· What is the difference between button bits, cross bits, and chisel bits?

Button bits provide higher penetration rates and longer service life. Cross bits offer better guidance in fractured rock formations, while chisel bits are economical for softer rock conditions.

· What taper angles are available?

4°46′, 6°, 7°, 11°, and 12°.

· Which drill rods are compatible?

H19, H22, and H25 tapered drill rods.

· What rock formations are suitable for tapered drill bits?

Soft, medium-hard, and hard rock formations depending on the bit design selected.

· What is the typical drilling depth?

Generally suitable for shallow-hole drilling applications below 6 meters.