Threaded Drill Bit

General introduction

Our threaded top hammer drill bits are designed for efficient rock drilling with high penetration rates and extended service life. Manufactured from high-quality alloy steel and premium tungsten carbide inserts, they provide reliable impact energy transfer and excellent wear resistance.

Suitable for a wide range of rock conditions, from soft to extremely hard and abrasive formations, these bits deliver a balanced performance of drilling efficiency, durability, and cost effectiveness.

Technical Specifications & Product Selection

1. Bit Face Selection

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

2. Tungsten carbide (Buttons) Design

Tungsten carbide (Buttons): Hemispherical button      Parabolic button (Semi ballistic)      Ballistic button

Hemispherical button	Parabolic button(Semi ballistic)	Ballistic button

Hemispherical button：Suitable for very hard and highly abrasive rock formations with UCS above 250 MPa.

Parabolic button (Semi ballistic)：Designed for medium hard to hard and highly abrasive rock formations with UCS of 150–250 MPa.

Ballistic button： Designed for soft and non-abrasive rock formations with UCS below 150 MPa.

3. Skirt: normal and 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:

· Secure Carbide Retention: Advanced hot-insert technology ensures strong carbide fixation, reducing button loss and extending service life.

· High Impact Resistance: Premium alloy steel with optimized carburizing heat treatment provides superior fatigue strength and durability.

· Efficient Flushing Design: Optimized flushing holes improve chip removal, prevent regrinding, and enhance drilling efficiency.

· Enhanced Hole Accuracy: Optimized face and skirt design minimize hole deviation in fractured and challenging rock conditions.

Product Overview

The main thread forms are R22, R25, R28, R32, TR35, T38, T45, T51, ST58, ST68, EL60, EL68 and T60 thread drill bit products, commonly used models are as follows.

Related Rock Drilling Tools

Build a complete, high-performance drill string with our matching accessories:

Top Hammer Drill Rods Extension Drill Rods, Hexagonal Drifting Rods, Male-Female (MF) Rods	Shank Adapters Precise energy-transmitting adapters for all major rock drill models	Coupling Sleeves Reliable semi-bridge and full-bridge couplings	Tapered Rock Drilling Tools Tapered Bits and Rods for smaller handheld operations	DTH (Down-the-Hole) Equipment DTH Hammers, Drill Pipes, and Large Diameter DTH Bits