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Deep Hole Drilling Tube – Types, Properties, and Applications

Introduction to Deep Hole Drilling Tubes

Deep hole drilling tubes are specialized components used in machining processes where deep, precise, and straight holes are required. Unlike conventional drilling, deep hole drilling is designed to achieve extreme depths (often greater than 10 times the diameter of the hole) while maintaining accuracy and surface finish.

These tubes are critical for industries such as oil & gas, automotive, aerospace, heavy machinery, and defense, where precision bores are essential for hydraulic cylinders, drive shafts, and firearm barrels.

What is a Deep Hole Drilling Tube?

A deep hole drilling tube is a hollow cylindrical component used to remove chips and cool the drill during long and deep drilling operations. It is an integral part of deep hole drilling tools like BTA (Boring and Trepanning Association) drills and gun drills, which require efficient chip evacuation and cooling.

Key Features of Deep Hole Drilling Tubes:

  • High wear resistance to withstand extreme conditions.

  • Designed for precise chip removal and lubrication flow.

  • Suitable for deep holes with high surface finish requirements.

  • Available in various diameters and lengths based on the drilling tool.

Types of Deep Hole Drilling Tubes

Deep hole drilling tubes are designed based on the type of drilling system:

1. BTA Drilling Tubes

  • Used with BTA drilling systems for holes larger than 20 mm.

  • Provides efficient chip removal through internal tubes.

  • Ideal for large-scale industrial drilling.

2. Gun Drilling Tubes

  • Used for smaller diameter holes (1–25 mm).

  • Ensures straight bores and fine surface finishes.

  • Common in precision engineering and firearms manufacturing.

3. Ejector Drilling Tubes

  • Suitable for CNC machines or conventional lathes.

  • Uses a two-tube system for coolant flow and chip removal.

  • Popular in the automotive and heavy equipment industries.

Materials Used for Deep Hole Drilling Tubes

The choice of material for deep hole drilling tubes is crucial due to the high stress and heat during drilling. Common materials include:

  • Alloy Steel (4140, 4340): Provides high strength and durability.

  • Tool Steels (H13, D2): Suitable for heavy-duty drilling operations.

  • Carbide-Lined Tubes: Used for extreme wear resistance.

  • Stainless Steel (304, 316): Ideal for corrosion-resistant applications.

Properties of Deep Hole Drilling Tubes

  • Hardness: Heat-treated to handle high-speed drilling.

  • Straightness: Precision manufacturing ensures minimal deflection.

  • Thermal Stability: Withstands heat generated during drilling.

  • Smooth Internal Surface: Enhances coolant flow and chip evacuation.

  • Custom Sizes: Available in diameters ranging from 10 mm to 400 mm.

Manufacturing Process of Deep Hole Drilling Tubes

  1. Material Selection: High-strength steel alloys are chosen.

  2. Tube Boring or Gun Drilling: The tube is drilled using deep hole techniques.

  3. Heat Treatment: Increases hardness and wear resistance.

  4. Honing: Improves internal surface finish and roundness.

  5. Quality Control: Tubes are tested for straightness and dimensional accuracy.

Applications of Deep Hole Drilling Tubes

1. Automotive Industry

  • Manufacturing engine blocks, crankshafts, and fuel injectors.

2. Oil & Gas Sector

  • Drilling tubes for hydraulic cylinders, valves, and drill pipes.

3. Aerospace

  • Aircraft landing gear, struts, and precision shafts.

4. Defense and Firearms

  • Gun barrels and weapon components requiring long, straight bores.

5. Industrial Equipment

  • Heat exchanger tubes, hydraulic pistons, and heavy machinery components.

Advantages of Using Deep Hole Drilling Tubes

  • High Precision: Achieves tolerance levels as low as ±0.05 mm.

  • Improved Surface Finish: Reduces need for secondary finishing operations.

  • Efficient Chip Removal: Prevents clogging in deep bores.

  • Cost-Effective Production: Reduces machining time and tool wear.

  • Versatility: Compatible with multiple deep hole drilling systems.

Deep Hole Drilling Tube vs. Standard Tubes

Feature Deep Hole Drilling Tube Standard Tube
Precision Extremely high Standard tolerance
Internal Finish Honed and polished Rough or semi-finished
Applications Specialized drilling systems General fluid or gas transport
Material Strength Hardened alloy steels Regular mild steel

Why Choose Titan Steel for Deep Hole Drilling Tubes?

At Titan Steel, we specialize in high-performance deep hole drilling tubes that meet stringent industrial requirements.

Our Advantages:

  • Supply of BTA, gun drilling, and ejector tubes in various grades.

  • Custom sizes, heat treatment, and machining options.

  • ISO-certified quality control for precision and reliability.

  • Competitive pricing with on-time deliveries across India.

Contact Us

Looking for deep hole drilling tubes for your projects?
👉 Get a Quote or call +91 7385863226.
Email: sales@titansteel.in
Visit: Plot No. 15, Khan Compound, Taloja M.I.D.C., Navi-Mumbai 410208, Maharashtra, INDIA.

Final Thoughts

Deep hole drilling tubes are indispensable in industries where precision, depth, and performance matter. With the ability to handle challenging drilling operations while maintaining accuracy, these tubes are a cornerstone of modern manufacturing and engineering.

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