138mm DHD3.5-138 Concave DTH Drill Bit Reinforced with Embedded PDC Cutters for Quarrying & Mining

138mm DHD3.5-138 Concave DTH Drill Bit Reinforced with Embedded PDC Cutters for Quarrying & Mining :

Product Specification

·    Bit Type: DTH Hammer Bit

·    Code No.: DHD3.5-138

·    Diameter: 138 mm

·    Shank Type: DHD3.5

·    Air Holes: 2

·    Gauge Buttons: 8 × φ17mm

·    Face Buttons: 7 × φ14mm

·    PDC cutter Type: Dome / Hemispherical PDC Cutters

·    PDC Cutter Function: Improve Wear Resistance & Improved Hole Quality

·    Face Design: Concave

·    Application: Quarrying, Mining

The DHD3.5-138 is widely used in quarrying, open-pit mining, blast hole drilling, and infrastructure rock excavation. Its embedded PDC cutter reinforcement helps maintain hole quality while extending drill bit life in abrasive and high-impact drilling environments.

Product Description

The 138mm DHD3.5-138 DTH drill bit is developed for quarrying and mining applications where drilling stability and impact resistance are essential. Reinforced with embedded premium PDC cutters, it combines a concave face profile with dome and hemispherical carbide buttons to improve gauge protection, reduce wear, and maintain reliable drilling performance in abrasive rock formations.

Embedded PDC Cutters for Small-Diameter Precision Drilling

The DHD3.5-138 DTH drill bit features a hybrid cutting structure that combines premium tungsten carbide buttons with strategically embedded PDC cutters. The embedded PDC cutters reinforce the gauge area, minimizing peripheral wear while maintaining consistent hole diameter throughout extended drilling operations.

Designed with a concave face profile, the bit provides smooth cuttings evacuation and improved drilling stability. The combination of dome and hemispherical carbide buttons offers outstanding impact resistance and balanced rock-breaking performance, making it suitable for repeated heavy-duty drilling in quarrying and mining environments.

This optimized design enhances drilling efficiency, extends service life, and reduces maintenance requirements, helping contractors achieve lower drilling costs and more consistent production.

Key Features

·    Reinforced with embedded premium PDC cutters

·    Hybrid carbide button and PDC cutter design

·    Concave face for improved drilling stability

·    Dome and hemispherical carbide buttons for high impact resistance

·    Enhanced gauge protection and reduced wear

·    Stable penetration in abrasive rock formations

·    Long service life with lower operating costs

·    Ideal for quarrying and mining applications