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Home > Drilling Tools > High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
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High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools
High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools

High-Speed Tungsten Carbide Internal Cooling CNC Metal Drilling Tools Solid Carbide Deep Hole Drill Bits for Machine Tools

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Product Description

Deep Hole Drill Banner
Deep Hole Drill Parameter Table
Parameter Specification Diagram
Product View 1
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Product View 6
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Product View 8
Product Parameters
Product Parameters Schema
⚙️ Product Name
Deep Hole Drill MDH Series
🛡️ Product Coating
Uses a special high lubricity and high wear resistance coating
⚡ Product Features
It can further improve the efficiency of deep hole processing, thus becoming a new deep hole processing drill that can improve stable chip discharge and drill strength.
Detailed Parameters Spec
Work Material Mild Steel / Low Carbon Steel
SS400 · S10C ~ 150HB ~ 500N/mm²		 Carbon Steel
S35C · S50C ~ 210HB ~ 710N/mm²		 Alloy Steel
SCM · SCr · SNCM 16 ~ 28HRC 710 ~ 900N/mm²		 Alloy Steel · Prehardened Steel
(C ≤ 0.3%) SCM440 28-34HRC 900 ~ 1060N/mm²
Cutting Speed 60-125 m/min 60-125 m/min 60-125 m/min 50-70 m/min
Drill Dia. (mm) Speed (min⁻¹) Feed (mm/r) Speed (min⁻¹) Feed (mm/r) Speed (min⁻¹) Feed (mm/r) Speed (min⁻¹) Feed (mm/r)
~ 3 7500 0.06 ~ 0.12 7500 0.06 ~ 0.12 7500 0.06 ~ 0.12 6300 0.08 ~ 0.11
~ 4 6400 0.08 ~ 0.16 6400 0.08 ~ 0.16 6400 0.08 ~ 0.16 4700 0.1 ~ 0.15
~ 5 5800 0.1 ~ 0.2 5800 0.1 ~ 0.2 5800 0.1 ~ 0.2 3800 0.12 ~ 0.18
~ 6 4800 0.12 ~ 0.24 4800 0.12 ~ 0.24 4800 0.12 ~ 0.24 3100 0.14 ~ 0.02
~ 8 3600 0.16 ~ 0.28 3600 0.16 ~ 0.28 3600 0.16 ~ 0.28 2300 0.16 ~ 0.24
~ 10 2900 0.2 ~ 0.35 2900 0.2 ~ 0.35 2900 0.2 ~ 0.35 1900 0.18 ~ 0.27
~ 12 2400 0.24 ~ 0.42 2400 0.24 ~ 0.42 2400 0.24 ~ 0.42 1500 0.24 ~ 0.3
Work Material Mild Steel / Low Carbon Steel
SS400 · S10C ~ 150HB ~ 500N/mm²		 Carbon Steel
S35C · S50C ~ 210HB ~ 710N/mm²		 Alloy Steel
SCM · SCr · SNCM 16 ~ 28HRC 710 ~ 900N/mm²		 Alloy Steel · Prehardened Steel
(C ≤ 0.3%) SCM440 28-34HRC 900 ~ 1060N/mm²
Cutting Speed 60-125 m/min 60-125 m/min 60-125 m/min 50-70 m/min
Drill Dia. (mm) Speed (min⁻¹) Feed (mm/r) Speed (min⁻¹) Feed (mm/r) Speed (min⁻¹) Feed (mm/r) Speed (min⁻¹) Feed (mm/r)
~ 3 7500 0.06 ~ 0.12 7500 0.06 ~ 0.12 5300 0.06 ~ 0.12 4200 0.08 ~ 0.11
~ 4 6400 0.08 ~ 0.16 5600 0.08 ~ 0.16 4400 0.08 ~ 0.16 3100 0.1 ~ 0.15
~ 5 5800 0.1 ~ 0.2 4500 0.1 ~ 0.2 3800 0.1 ~ 0.2 2500 0.12 ~ 0.18
~ 6 4800 0.12 ~ 0.24 3800 0.12 ~ 0.24 3200 0.12 ~ 0.24 2100 0.14 ~ 0.02
~ 8 3600 0.16 ~ 0.28 2800 0.16 ~ 0.28 2400 0.16 ~ 0.28 1500 0.16 ~ 0.24
~ 10 2900 0.2 ~ 0.35 2300 0.2 ~ 0.35 1900 0.2 ~ 0.35 1200 0.18 ~ 0.27
~ 12 2400 0.24 ~ 0.42 1900 0.24 ~ 0.42 1600 0.24 ~ 0.42 1000 0.24 ~ 0.3
1. This cutting parameter reference table is applicable to water-soluble cutting oil or oil mist cooling processing.
2. Please use high-quality water-soluble cutting oil with a dilution ratio of 20~30 times.
3. When using non-water-soluble cutting oil, please adjust the cutting parameters to between the minimum speed in the table and 70%.
4. Oil blockage will cause the product to break, so please be sure to install a filter on the oil supply equipment.
5. When processing high-hardness materials, please use 1D~2D pecking drilling.
Product Advantages
Core Advantages
🛠️
Non-standard customization: When our standard stock cannot meet your requirements, we provide more professional and precise non-standard customization. You only need to select the series you need.
Processing Steps Diagram
1
Use a dedicated pilot drill or DK280 series 3D standard stock for pilot hole processing
For pilot hole processing tools, please select a drill with a blade diameter Dc 0.02-0.05mm larger than that of the MDH type deep hole drill. It is recommended to deepen the pilot hole as much as possible during processing.
Step 1 Diagram
2
Insert the MDH deep hole drill into the guide hole at a low speed
Speed: 500min⁻¹ | Feed speed: 1000~2000mm/min
Note: Inserting the deep hole drill into the guide hole at the set cutting speed will cause damage to the shoulder of the deep hole drill due to the radial runout of the drill outer circle.
Step 2 Diagram
3
Increase the speed to the set cutting speed, and then perform cutting feed
Some CNC machine tools will issue a cutting feed instruction before reaching the set speed, so it is recommended to enter a pause instruction before the cutting feed instruction.
Step 3 Diagram
4
After processing, reduce the speed and pull the drill out of the material being cut
Speed: 500min⁻¹ | Feed speed: 1000~2000mm/min
Note: Pulling the deep hole drill out of the material being cut at a high speed may cause the drill to break due to vibration, which is very dangerous!
Step 4 Diagram
5
Other precautions
When the guide hole tool has a bevel entrance, the flat bottom surface needs to be processed first.
Step 5 Diagram
Cooling Method Diagram
Cooling and Lubrication Precautions
💧 1. When cooling internally
  • Please use an oil equivalent to JISA Class 1 No. 1 (emulsion).
  • Pump original pressure - Steel: 1.5~2.0MPa (Cooling effect is stronger under high pressure, but it will affect chips and damage).
  • Pump original pressure - Castings, aluminum alloys: 4.0-6.0MPa (focus on cooling).
🌀 2. When MQL is internally
  • Air pressure: 0.5MPa or more.
  • Discharge volume: It is recommended to set the maximum discharge volume of the device used. When used for aluminum alloys, please adjust appropriately.
🧪 3. When spraying two liquids internally
  • Air pressure: 0.5MPa or more.
  • Discharge volume: It is recommended to set the device used to the optimal state before processing.
Process Demonstration
Details Images
Deep Hole Processing
Deep Hole Processing
The new groove shape - J-type chip removal groove that can maintain stable chip handling during deep hole processing. Can process deep holes 20 times the drill diameter at high efficiency (5 in the blade diameter is equivalent to S48C) at Vf-1000mm/min or more. The special chisel shape RX chisel reduces cutting resistance during efficient processing.
Long Life Performance
Long Life
Using a special high lubricity and high wear resistance coating, it can achieve long life in processing various cut materials. By improving chip removal performance and reducing spindle load fluctuations, a stable and long life is achieved.
Environmental Protection
Environmental Protection
Supports MQL (Minimal Quantity Lubrication) and dual-liquid spray (oil and water are discharged simultaneously) for reduced environmental footprint and cleaner operations.
Final Product Overview
Frequently Asked Questions
What are the main applications and workpiece materials for the MDH series deep hole drill?
The MDH series deep hole drill is designed for processing materials such as Mild Steel/Low Carbon Steel (SS400, S10C), Carbon Steel (S35C, S50C), Alloy Steel (SCM, SCr, SNCM), and Prehardened Steel (SCM440).
What makes the MDH series coating special?
It features a specialized coating that offers exceptionally high lubricity and high wear resistance, significantly extending the service life when processing various tough materials.
What types of cooling systems does this drill support?
This drill supports internal liquid cooling (water-soluble emulsion oil recommended), Minimal Quantity Lubrication (MQL) internal oil mist cooling, and dual-liquid spray cooling.
Why must the MDH drill enter the pilot hole at low speed?
Entering the pilot hole at the set high cutting speed can cause damage to the outer edge/shoulder of the deep hole drill due to radial runout. Inserting at a low speed (approx. 500 min⁻¹) protects the tool.
What is the advantage of the J-type chip removal groove?
The J-type groove shape keeps chip removal stable and consistent during deep hole processing, allowing efficient drilling depth up to 20 times the drill diameter while reducing spindle load fluctuations.
Can I customize non-standard sizes for this deep hole drill?
Yes, we provide professional and precise non-standard customization when our standard stock sizes do not match your exact specifications. You can easily specify and select the series you need.

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