Threaded Drill Bits

Threaded Drill Bits for Top Hammer Drilling

Qstone threaded top hammer drill bits are designed for mining, quarrying, tunneling and construction drilling applications. Available in a wide range of thread systems, including R25, R28, R32, R35, R38, T38, T45, T51 and ST58, the range covers different bit diameters, face designs and button configurations for various rock conditions.

Manufactured from alloy steel and tungsten carbide buttons, the bits are designed to provide stable impact transmission, wear resistance and consistent drilling performance. Different carbide grades and bit designs can be selected according to rock hardness, abrasiveness and drilling conditions.

For hard and highly abrasive rock, selecting the correct face design, button shape and carbide configuration is often more important than simply comparing bit price.

Technical Specifications & Product Selection

1. Bit Face Selection

Button bit design: Flat face, drop centre, Semi-dome bits 

2. Tungsten Carbide Button Selection

Hemispherical button	Parabolic button(Semi ballistic)	Ballistic button

Hemispherical Button
Recommended for hard to very hard and highly abrasive rock formations. The rounded profile provides good wear resistance and carbide strength, making it suitable for demanding drilling conditions.

Parabolic Button (Semi-Ballistic)
Suitable for medium-hard to hard rock formations. It provides a balance between penetration rate and wear resistance and can be used across a relatively wide range of drilling conditions.

Ballistic Button
Suitable for soft to medium-hard and relatively low-abrasive rock formations. The sharper profile helps improve penetration rate, but it is generally less suitable for highly abrasive or very hard rock.

Selection Note: Rock UCS can be used as a reference, but button shape should not be selected by compressive strength alone. Rock abrasiveness, formation integrity, drilling parameters and required penetration rate should also be considered.

3. Skirt Design: Normal Skirt vs. Retract Skirt

Application: 

Suitable for a wide range of rock drilling applications, including open-pit and underground mining, tunneling, quarrying, roadway excavation, anchoring engineering, hydropower projects, and construction works.

Features:

Hot-Inserted Carbide Buttons: Carbide buttons are installed using a hot-insertion process to provide secure retention in the bit body under repeated impact loading and demanding drilling conditions.

Carburized Alloy Steel Body: The alloy steel bit body undergoes carburizing heat treatment to provide a wear-resistant surface while maintaining the toughness required to withstand repeated impact loads.

Efficient Flushing: Flushing holes are designed to remove rock cuttings efficiently and reduce secondary crushing during drilling.

Stable Drilling Performance: Face design, button configuration and skirt design can be selected according to rock conditions to support stable drilling and help control hole deviation.

Product Overview

The main thread forms are R25, R28, SR28, R32, R35, R38, T38, T45, T51, ST58, ST68, GT60 thread drill bit products, commonly used models are as follows.

Need Help Selecting the Right Threaded Drill Bit?

Choosing the right bit depends on the thread system, bit diameter, rock hardness, abrasiveness and drilling conditions.

Send us your required specifications or current drilling information, including:

• Thread size and bit diameter
  
• Rock type or drilling application
• Drill rig or drifter model, if available
  
• Photos of your current or used drill bits, if available

Qstone can review your drilling requirements and recommend a suitable face design, button shape, carbide configuration and bit specification for testing.

Email: info@q-stones.com
WhatsApp: +86-15538565281

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