Core Bits
Your Professional Core Bits Supplier
Our goal is to become your true partner in the field of core barrels in China. Guizhou Gold Drills Equipment Co., Ltd (GDRILLS) was established in China. The key management, sales team and professional technical engineers have been served in rock drilling industry for more than 20 years. We have a skilled engineering team dedicated to refining every stage, from product development and process improvement to production oversight, ensuring every product delivered meets rigorous quality and performance standards. The price is competitive and the product is quality-assured, which is a good choice for your long-term cooperation.
Why Choose Us
Our certificates
We have established a complete quality management system and passed ISO9001 quality management system certification and ISO14001 environmental protection management system certification.
Production market
Our products have been used in many large-scale mines and tunnel projects, and our business scope covers Africa, the Middle East, Central Asia, South America, Australia and other regions.
Our services
In the pre-sales stage, our team of experts will recommend the most suitable products according to the needs of customers and provide detailed technical consultation. During the sales period, we ensure timely delivery and provide installation guidance. For after-sales, we provide long-term technical support, warranty services and spare parts to help customers maximize the use of products and get reliable maintenance during use.
What is a Core bit
A hollow cylindrical drilling tool with industrial diamonds implanted in its cutting edge is called a diamond core bit. It is crucial for geological investigation because, in contrast to conventional drill bits, it only extracts a ring of material while leaving a cylindrical core sample intact.
This design avoids damage to adjacent material, increases drilling accuracy, and uses less energy.
Specialized Cutting Technologies for Every Formation
- Impregnated Diamond Core Bits
For hard to ultra-hard formations, this is our most popular option. The diamonds are evenly dispersed throughout the metal matrix. New diamonds are revealed when the matrix deteriorates, keeping the cutting edge sharp.
- Surface Set Diamond Core Bits
Perfect for formations that are mild to medium-hard. Large natural diamonds are set in a single layer on the bit face. When high fluid bypass is needed, it works well for non-consolidated formations and sedimentary rocks.
Advantages of Core Bits
Cut through tough materials
Diamond core drill bits are capable of cutting through the toughest tiles, including ceramic, porcelain, and even natural stone. Their diamond-impregnated tips provide exceptional cutting power.
Less debris and dust
Compared to traditional drilling methods, diamond core drill bits produce less debris and dust. This is particularly important for indoor applications where minimizing mess is desirable.
High-speed drilling
Diamond drill bits can be used with incredible speed tearing through everything from concrete to marble. This saves time and effort, especially in large projects.
Low noise levels
Diamond core drill bits produce less noise compared to other drilling methods, making them more suitable for use in residential and commercial areas where noise pollution is a concern.
Cost-effective
While diamond core drill bits may have a higher initial cost compared to other drill bits, they are more durable and have a longer lifespan. This makes them cost-effective in the long run as they require fewer replacements.
Specification of Core Bits
|
Size |
Outside Set Diameter |
Inside Set Diameter |
||
|
Inch |
Mm |
Inch |
Mm |
|
|
EWG, EWM |
1.475 /1.465 |
37.46/37.21 |
0.850 / 0.840 |
21.59 / 21.34 |
|
TEW |
1.475 /1.465 |
37.46/37.21 |
0.903/0.893 |
22.94 / 22.68 |
|
EWT (EXT) |
1.475 / 1.465 |
37.46 / 37.21 |
0.910/0.900 |
23.11 / 22.86 |
|
IEW, IEWS |
1.475 / 1.465 |
37.46 / 37.21 |
1.000 / 0.990 |
25.40 / 25.15 |
|
AQ |
1.880 / 1.870 |
47.75 / 47.50 |
1.067 / 1.057 |
27.10 / 26.85 |
|
AQ-RSG |
1.895 / 1.885 |
48.13/47.88 |
1.067 / 1.057 |
27.10 / 26.85 |
|
AXC (AWC3) |
1.895 / 1.885 |
48.13 / 47.88 |
1.067 / 1.057 |
27.10 / 26.85 |
|
ATW |
1.880 / 1.870 |
47.75 / 47.50 |
1.190 / 1.180 |
30.22 / 29.97 |
|
AGM |
1.880 / 1.870 |
47.75 / 47.50 |
1.198 / 1.188 |
30.43 / 30.18 |
|
AQTK |
1.880 / 1.870 |
47.75 / 47.50 |
1.206 / 1.196 |
30.63 / 30.38 |
|
AWT (AXT) |
1.880 / 1.870 |
47.75 / 47.50 |
1.286 / 1.276 |
32.66 / 32.41 |
|
TAW |
1.880 / 1.870 |
47.75 / 47.50 |
1.312 / 1.302 |
33.32 / 33.07 |
|
ATK-34 (AW34) |
1.880 / 1.870 |
47.75 / 47.50 |
1.325 / 1.315 |
33.65 / 33.40 |
|
IAW, IAWS |
1.880 / 1.870 |
47.75 / 47.50 |
1.394 / 1.384 |
35.40 / 35.15 |
|
LTK48, JTK48 |
1.880 / 1.870 |
47.75 / 47.50 |
1.394 / 1.384 |
35.40 / 35.15 |
Features of Core Bits
|
Core Bit Type |
Features |
Advantages |
|
E gauge core bits |
Smallest diameter, ideal for shallow exploration, lightweight |
Cost-effective, requires less drilling fluid and power, ideal for preliminary surveys |
|
B gauge diamond bits |
Standard size for lightweight exploration, balanced cutting structure, suitable for soft to medium-hard rock |
Good core recovery in softer formations, less wear on equipment, faster penetration rate |
|
N gauge coring bits |
Most commonly used in mineral exploration, balanced between core size and drilling efficiency, reinforced gauge section |
Ideal for deep drilling in medium-to-hard formations, higher core recovery, minimal borehole deviation |
|
H gauge wireline core bits |
Larger diameter, designed for hard and fractured formations, thicker gauge protection |
Maintains hole stability, longer bit life, reduces core loss in fractured zones |
|
P gauge wireline bits |
Largest standard gauge core bit, high-yield drilling, best for geotechnical and environmental drilling |
Maximum core size for detailed analysis, efficient for bulk sampling, ensures hole stability in soft formations |
|
S gauge core bits |
Heavy-duty for extreme conditions, deep drilling, highly abrasive formations |
Exceptional wear resistance, suitable for high-stress applications, minimizes reaming needs |
Application of Core Bits
Construction and infrastructure
In the construction realm, diamond core bits reign supreme. They effortlessly pierce through cured and reinforced concrete, pre-stressed structures, and asphalt. These bits facilitate the creation of precise holes for various utilities like air-conditioning ducts, water pipes, gas conduits, and electrical fixtures in walls and floors.
Masonry and architecture
When dealing with brick, block, and stone, diamond core bits offer unmatched accuracy. They’re instrumental in architectural projects, swiftly drilling holes for plumbing, electrical installations, and intricate designs.
Renewable energy and utilities
In the renewable energy sector, these bits aid in the installation of solar panels and wind turbines by efficiently penetrating the tough surfaces required for their foundations.
Packing and Shipping of Core Bits
|
Packing |
Cartonbox, plastic bag, wooden case. |
|
Shipping |
Shipped by road, sea, rail |
Q: What is a core bit?
A: A hollow cylindrical shaped cutting tool for core sample extraction drilling, that moves forward by rotation leaving inside it the sample of ground for retrieval and keeping it as a sample of the various depth layers or as a continuous shaft.
Q: Will core bits go through rebar?
A: Depending on how thick the rebar itself is, you'll have a number of options regarding which type of core bit to work with, but generally speaking you'll have to use either a diamond-tipped core bit or a carbide core drill bit.
Q: How long do coring bits last?
A: Generally, you can expect to drill between 150-250 holes with each bit.
Q: Do you use a hammer drill with a core bit?
A: The core bit is designed to work on hammer function. If you can access both sides of the wall safely to drill I would put a pilot hole the same size as the pilot bit all the way through the wall. I would then if possible drill from the reverse side for around 20mm depth.
Q: What size are concrete core bits?
A: Bits may be supplied either with Open Back-End (O.B.E.) or Solid Back-End (S.B.E.) with standard 1.1/4″ UNC female connection. Standard diameters are 102, 142, 152, 300 & 450mm but other sizes are available on request. Standard length is 450mm.
Q: How do you remove a core bit?
A: To remove a stuck core bit, start by loosening it from the drill or machine by turning the chuck counterclockwise. If the bit is deeply embedded, try using a tap extractor, chiseling off jagged edges, or creating a divot with a centerpunch. You can also try using a hammer and WD-40 to loosen the bit.
Q: How do I choose the right waterway shape (Discharge)?
A: For competent rock, standard canals work well. To avoid core washing and guarantee better flushing, we suggest "Pie-Shaped" or "Face Discharge" designs for fractured or soft formations.
Q: Are Gdrills bits compatible with my existing wireline system?
A: Yes, our core bits are manufactured to global ISO and DCDMA standards. They are 100% compatible with B, N, H, and P wireline core barrels.
Q: What is the benefit of a 16mm crown height?
A: In deep-hole applications, a 16mm crown offers substantially more "wearable" material than a typical 12mm crown, boosting total meters per bit and decreasing the frequency of rod pulls.