Solid Carbide Long Drill Bits
ZLY produces extra-long solid carbide drills to support high-precision deep hole machining.
By using internal coolant technology in long drills, chips can be flushed out, the working condition of the drill tip can be maintained, and the machining temperature can be controlled.
Therefore, ZLY solid carbide extra-long drill bits are suitable for high-precision deep hole machining of difficult-to-machine materials.

Custom Solid Carbide Long Drill Bits for Your Project
ZLY has more than 20 years of experience in the field of custom solid carbide cutting tools and adheres to strict quality control (QC). All ZLY long drills are designed and manufactured based on the ISO 9001 quality standard.
ZLY long drills are made of solid carbide and are widely favored for their high hardness, wear resistance, and excellent high-temperature resistance.
- More than 20 years of experience in non-standard drill manufacturing
- We can provide any type of solid carbide drill
- Competitive prices and short delivery time
- 24/7 online support for your business
Custom Long Drills Size Range Available from ZLY
ZLY’s strong manufacturing capability can meet all machining applications that require solid carbide cutting tools. Our CNC drilling tools are best for machining metals such as aluminum, copper, steel, stainless steel, titanium alloys, and hard metals. Below is the size range of long drills we can produce.
|
Cutting Diameter |
3mm – 35mm |
|
Cutting Length |
0.2mm – 250mm |
|
Shank Diameter |
3mm – 32mm |
|
Overall Length |
20mm – 330mm |
|
Helix Angle |
15° – 75° |
|
Coating Services |
TiN, TiCN, TiAIN, ALTiN, DLC, etc. |
Send Your Inquiry On ZLY Carbide Long Drill Bits
Over the years, ZLY has continued to invest in developing long drills with higher precision and smaller diameters. We have invested in high-quality material testing equipment and machining machines to produce stable, consistent, and high-level extra-long drills.
With ZLY’s engineering and design expertise, we have thousands of solid carbide cutting tool design solutions for you to choose from. We are committed to providing high-quality cutting tools in your machining process to reduce your average tooling cost while helping you maintain market competitiveness.
Additional Services
Beyond supplying high-quality cutting tools, we also offer the following services:
- Competitive pricing
- Free tool design based on your workpiece drawings
- Free dimensional inspection based on your tool samples
- Laser marking according to your requirements
- Free local delivery within Thailand
Recent Walk in Long Drill Bits Order
ZLY: Your Professional Solid Carbide Long Drill Bits Manufacturer
In fact, with the development of today’s manufacturing industry, the importance of solid carbide long drills in various application fields has become increasingly prominent.
In automobile manufacturing, aerospace, and precision mold and equipment manufacturing, through holes from top to bottom are required for assembly. Conventional drills cannot reach such lengths, while solid carbide drills can meet this requirement.
This type of tool plays a critical role in producing deep holes while ensuring hole accuracy and machining efficiency.
If you are looking for a way to customize carbide extra-long drilling tools, then this guide is exactly right for you.
Here, I would like to introduce all aspects of carbide drills.
After reading this guide, I am sure you will be able to make informed decisions when customizing carbide drills.
What is a carbide long drill Bits?
Solid carbide long drills are drills with an extended cutting edge structure. Their cutting length is usually greater than 150 mm, and they are made of solid carbide, featuring high hardness and high wear resistance.
We recommend using long drills with internal coolant. This design enables cooling and chip evacuation, ensuring drilling accuracy and tool life.
What materials are solid carbide long drills suitable for?
Solid carbide long drills are suitable for machining aluminum alloys, copper alloys, iron, cast iron, steel, hardened steel, stainless steel, titanium alloys, hard plastics, and more.
We use high-quality coatings to increase tool hardness and reduce friction, improving drilling tool life when machining high-hardness materials.
What are the applications of solid carbide long drills?
This type of long drill is suitable for many industries, such as:
Automotive industry
Aerospace industry
Medical industry
Mold manufacturing industry
Machinery manufacturing industry
How to ensure smooth deep hole drilling?
First, you can use a spot drill or center drill for pre-drilling before formal drilling to ensure the starting position of the long drill is accurate.
Second, during drilling, be sure to ensure sufficient coolant supply. The coolant not only reduces temperature but also flushes chips out of the hole, preventing drill breakage due to chip accumulation.
In addition, when machining high-hardness materials, avoid excessive feed rates.
How can hole deviation be avoided?
Ensure the workpiece is stable and the machine has sufficient rigidity. Use carbide drills instead of high-speed steel drills, and ensure the drill is clamped securely.
Pre-drilling to create a reference can also ensure correct hole positioning.
Why is the tip of my long drill easy to get damaged?
It may be because the feed rate or spindle speed is too high, or the material is too hard while the tool coating selection is not appropriate.
It may also be that the coolant does not reach the bottom of the hole, resulting in dry cutting.
We recommend using an internally cooled long drill with better cooling.
If you have any further questions, please feel free to contact our engineers, and we will be happy to assist you.















