SD Series DTH drill bits are widely used in medium to large-diameter rock drilling applications.
Compared with smaller DTH drill bits, SD series bits are engineered for higher impact energy transfer, improved drilling stability, and stronger performance in hard rock formations.
They are commonly applied in mining, quarrying, water well drilling, and large-scale infrastructure projects, where drilling efficiency and reliability are critical.
SD Series bits are designed to deliver balanced performance between penetration speed, durability, and drilling stability in demanding rock conditions.
Optimized structure ensures efficient energy transfer from DTH hammer to rock, improving penetration rate in hard formations.
Premium alloy steel and tungsten carbide buttons provide strong resistance to abrasion and impact fatigue.
Balanced design reduces vibration and improves hole straightness in deep drilling applications.
Built for continuous drilling in mining, quarrying, and infrastructure projects with high workload requirements.
| SD Series | ||||||||
| Size Series (inch) |
Outer Dia (mm) |
Length (mm) |
Drilling Dia. (mm) |
Working Pressure (MPa) |
Connection with Drill Pipe |
Bit Shank | Weight (kg) |
Specihication |
| 4'' | φ99 | 998.0 | φ115-φ130 | 1.6-2.5 | 2 3/8 REG PIN | SD4 No Tail Pipe | 40.0 | KQCG115-SD4 |
| 998.0 | SD4 with Tail Pipe | 38.8 | KQCG115-SD4v | |||||
| 5'' | φ126 | 1092.0 | φ140~φ152 | 1.6-2.8 | 2 3/8 REG PIN/ 3 1/2 REG PIN |
SD5 No Tail Pipe | 69.8 | KQCG140-SD5 |
| 1044.0 | SD5 with Tail Pipe | 69.4 | KQCG140-SD5v | |||||
| 6'' | φ148 | 1250.0 | φ165-φ190 | 1.6-3.0 | 3 1/2 REG PIN | SD6 No Tail Pipe | 108.0 | KQCG165-SD6 |
| 1218.0 | SD6 with Tail Pipe | 107.0 | KQCG165-SD6v | |||||
| 8" | φ185 | 1333.0 | φ203-φ245 | 1.6-3.0 | 4 1/2 REG PIN | SD8 No Tail Pipe | 195.0 | KQCG203-SD8 |
| 1273.0 | SD8 with Tail Pipe | 173.0 | KOCG203-SDBV | |||||
| 10'' | φ225 | 1492.0 | φ254-φ305 | 1.6-3.5 | 5 1/2 REG PIN/ 6 5/8 REG PIN |
SD10 No Tail Pipe | 295.0 | KQCG254SD10 |
| 1452.0 | SD10 with Tail Pipe | 290.0 | KQCG254-SD10v | |||||
| 12'' | φ275 | 1793.5 | φ305~φ350 | 16~3.5 | 6 5/8 REG PIN | SD12 No Tail Pipe | 555.0 | KQCG305-SD12 |
| 1728.5 | SD12 with Tail Pipe | 548.0 | KQCG305-SD12v | |||||
|
Item |
Specification |
|
Shank Series |
SD Series |
|
Drilling Diameter Range |
115-350mm |
|
Button Material |
Premium Tungsten Carbide |
|
Bit Body Material |
Heat-treated Alloy Steel |
|
Suitable Rock |
Medium to Hard Rock |
|
Application Depth |
Shallow to Deep Drilling |
Can't find the parameters you want? Please get in touch with us!
Download BrochureSD Series bits are widely used in high-demand drilling environments requiring efficiency and stability.
Used for large-scale blast hole drilling with consistent penetration performance.
Suitable for granite, limestone, and basalt quarry extraction drilling.
Used in medium- to deep-water well-drilling projects with stable geological conditions.
Applied in foundation piling, slope support, and tunnel-related drilling works.
As a professional supplier of rock drilling tools, we are committed to providing reliable SD Series DTH drill bits for mining, quarrying, water well drilling, and infrastructure projects worldwide. With years of industry experience and continuous investment in production technology, we focus on delivering products that combine stable quality, drilling efficiency, and long-term operational reliability.
Our production system integrates:
These processes help ensure consistent product quality and stable drilling performance.
Each SD Series DTH drill bit undergoes strict quality inspection before shipment to ensure:
We maintain strong manufacturing capacity to support:
Our global supply capability helps customers maintain stable drilling operations with reduced downtime.
Our engineering team provides professional support for:
This helps customers improve penetration rate, extend bit service life, and reduce drilling costs.
We believe reliable products and responsive service are the foundation of long-term partnerships.
Our goal is to become a trusted supplier of drilling tools for customers seeking consistent quality, professional support, and dependable global supply.
Through rigorous quality control at every stage, Kelleg guarantees that our drill bits and other rock drilling tools meet the highest industry standards, delivering exceptional performance, reliability, and durability to our customers.
