Large Diameter DTH Drill Bits for Piling&Foundation

Rock Drilling Tools

Large Diameter DTH Drill Bits

Applicable hole diameter range: 305-1200mm
Face designs: flat face, convex face, concave face, double-row button face, center-drop face
Button types: domed button, semi-ballistic button, ballistic button, pointed button, flat button

Request a Quote

Typical Applications

Embedded installation methods for precast piles, CFA (continuous flight auger) rock-socketed piles, bored piles drilled into rock formations

CFA (continuous flight auger) rock-socketed piles

Bored piles drilled into rock formations

Technical Specifications

Model	12''	14''	18''	24''	28''
Length, L	260mm	258mm	324mm	321mm	355.8mm
Diameter,Ø	67mm	82.5mm	102mm	118mm	164.5mm
Length, L1	54mm	54.5mm	53mm	57mm	60.3mm
Diameter, Ø1	26mm	32mm	36.4mm	41mm	56mm
No. of splines	8	8	8	8	8
Recommended hole size	105-130mm	135-152mm	155-190mm	203-254mm	245-305mm
Shank model	DHD112 NUMA120 SD12 QL120	NUMA125 M140	NUMA180	NUMA240	NUMA280

Key Advantages

High-strength bit body: The large-diameter bit body is manufactured from high-strength alloy steel, providing excellent resistance to cracking and body breakage under high-impact drilling conditions.
Non-destructive inspection (NDT): Ultrasonic testing and magnetic particle inspection are applied to the bit body to eliminate material and forging defects, significantly reducing the risk of in-service failures.
Oversized carbide buttons: Enlarged carbide buttons are used to extend wear life and enhance rock-breaking efficiency, improving overall drilling performance.
Precision CNC machining: CNC machining of the bit body ensures high dimensional accuracy, reliable assembly, and consistent product quality.
Reinforced skirt design: A specially engineered high-strength, high-toughness skirt enhances structural integrity and ensures stable performance under severe impact and torque loads.
Spline shock-absorption design: The spline interface is integrated with damping buffer elements, reducing impact fatigue and significantly extending spline service life.

Related Products
Other Products

Drill Rigs Comprehensive mining equipment covering surface drill rigs and underground drill rigs for mining, tunneling and construction. Designed for high efficiency, safety and adaptability across diverse geological conditions and mining environments.

Air Compressors Air compressors designed for drilling, mining, and construction applications. Including portable diesel compressors, portable electric compressors, and stationary electric screw compressors, providing stable, efficient, and reliable air supply for various working conditions.

Is carbide button breakage covered by warranty?

Carbide button breakage alone is not covered by warranty. Carbide buttons are designed to fracture rock with extremely high hardness and normally do not fail under standard drilling conditions. Breakage typically occurs when carbide buttons collide with materials of similar hardness, such as alloy steel objects left in the borehole. Prior to drilling, the bore area should be checked and cleared of metallic obstructions.

During drilling, abnormal noise may indicate button fracture. In such cases, drilling should be stopped immediately and the borehole cleaned to prevent secondary damage or cascading button failure.

Is customization available?

Customization is supported, including color options, logo marking, and build-to-drawing or build-to-sample production. Customization can be provided for structural design, materials, and dimensions according to project requirements.