Tungsten Carbide Air Core Drill Bit for Mineral Reconnaissance, Weathered Rock & Overburden Sampling

Our tungsten carbide air core drill bit is specially designed for air core drilling systems. Triple-blade structure delivers stable cutting in saprolite, sand, gravel and unconsolidated overburden. It works with dual-wall drill rods to achieve low-contamination cuttings sampling for mineral reconnaissance, geotechnical, and environmental exploration. Custom sizes and threads available.

>> Characteristics

The air core drill bit is the key downhole tool for air core drilling programmes. It adopts a rotary cutting design with tungsten carbide blades, developed specifically for weathered strata and unconsolidated overburden. When paired with dual-wall drill rods, compressed air flows down the outer annulus, and the cuttings generated by the bit are lifted through the inner tube back to surface, which effectively reduces cross-contamination and guarantees reliable geochemical chip samples.

Different from RC DTH hammer bits or diamond core bits, this air core bit relies on rotational shear cutting rather than percussion impact. It is widely used for large-area reconnaissance screening before detailed RC or diamond drilling work.

>>Structure & Design

Multi-blade carbide cutting structure

2-blade or 3-blade optional layout. Thick tungsten carbide inserts are brazed firmly on the bit body, offering strong shear capacity for abrasive regolith and weathered rock. The blade angle is optimized to improve penetration stability and reduce bit bounce.

Optimized internal air passage

The internal flow channel is professionally designed to match the air circulation of a dual-wall pipe system. It ensures smooth air delivery and continuous cuttings transport, avoiding blockage in loose gravel and clay layers.

High-precision thread connection

The bit body is processed with precise API threads, including 2 3/8" REG, 2 7/8" REG, 3 1/2" REG options. It can connect perfectly with bit subs and dual-wall drill rods. Stable connection avoids loosening during long-time rotary drilling.

Robust alloy steel bit body. 

High-strength alloy steel body with heat treatment, good impact resistance and anti-abrasion performance, suitable for continuous field exploration work.

>> Specification

>> Project