DTH Bits

General Introduction

Qstone DTH button bits are designed for high-performance drilling in hard and abrasive rock. Manufactured from heat-treated alloy steel and fitted with wear-resistant tungsten carbide buttons, they deliver efficient rock breaking, reliable cuttings removal and long service life.

A wide range of bit diameters, shank types, face designs and button configurations is available to match different DTH hammers, rock formations and operating conditions.

Product Range

DTH bits are available in 3–12 inch sizes, with DHD, QL, Mission, SD, COP and BR shanks. Multiple face designs and carbide button shapes are available for different rock formations and drilling conditions.

Application

Qstone DTH bits are used for straight and efficient drilling in demanding rock conditions, including:

· Blast-hole drilling in mining and quarrying

· Water-well and geothermal drilling

· Foundation, piling and construction drilling

· Tunnelling and rock excavation

· Micropiling, anchoring and rock reinforcement

They are particularly suitable for applications requiring deep holes, high penetration rates and reliable performance in hard rock.

Drill Bit Face Design Selection

Face Design		Suitable Rock Formation	Features
Drop-Center Face		Soft to medium-hard, fractured rock formations	Fast penetration and minimal hole deviation
Concave Face		Wide range of formations, especially medium-hard and homogeneous rock	Minimal hole deviation and efficient cuttings removal
Convex Face		Soft to medium-hard rock formations	Excellent wear resistance and fast penetration
Flat Face		Hard and highly abrasive rock formations; suitable for high-pressure drilling	Fast penetration and low bit body wear
Double-Gauge Face		Medium-hard to hard rock formations	Fast penetration and uniform wear

Carbide Button Selection

Button Shape		Position on Bit Face	Suitable Rock Formation
Spherical Button		Mainly used as gauge buttons around the outer edge	Abrasive and very hard rock
Parabolic Button（Semi-Ballistic ）		Used as both gauge and face buttons	Medium-hard to hard, abrasive rock
Ballistic Button		Mainly used as face buttons; may also be used as gauge buttons in softer rock	Medium-hard rock with moderate abrasiveness
Sharp Button		Mainly used as face buttons	Soft, non-fractured rock requiring high penetration rates
Flat-Top Button		Mainly positioned around the gauge to protect the bit body	Highly abrasive rock formations

Technical parameter：

· Low-Pressure DTH Button Bits

· High-Pressure DTH Button Bits

Other shank types, bit diameters and customized designs are available upon request.

Features

· High-Strength Alloy Steel Body: Manufactured from premium alloy steel with optimized heat treatment for excellent impact strength, fatigue resistance and durability in demanding DTH drilling operations.

· Wear-Resistant Carbide Buttons: Selected tungsten carbide grades and button profiles deliver reliable penetration and extended bit life in hard and abrasive rock formations.

· Multiple Face Designs: Flat, concave, convex, drop-center and double-gauge designs are available to optimize penetration rate, hole straightness and wear performance.

· Optimized Air Flushing: Precisely positioned flushing holes and grooves efficiently remove rock cuttings, reduce re-crushing and overheating, and maintain stable drilling speed.

· Precision-Machined Shanks: Accurate shank dimensions ensure reliable compatibility with DHD, QL, Mission, SD, COP and NUMA DTH hammers, improving impact-energy transfer.

· Application-Specific Configuration: Bit diameter, shank type, face design, carbide shape and flushing layout can be selected according to rock conditions and drilling requirements.

· Reliable Drilling Performance: Qstone DTH button bits provide fast penetration, uniform wear and long service life for mining, quarrying, construction and water-well drilling.

Related Products

DTH-Drill-Pipe	DTH-Hammer

Inquiry

Need help selecting the right DTH bit?
Send us your hammer model, required bit diameter and rock conditions.