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The Ultimate Guide to Different Drill Bit Types: How to Choose the Right Tool for the Job

Dezhou Drillstar Cutting Tool Co., Ltd. officially resumed production amidst a festive and auspicious atmosphere.

Dezhou Drillstar Cutting Tool Co., Ltd. 2026 Year of the Horse Gala: A Resounding Success – Forging Precision, Riding the Wind of Progress

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Deep Hole Boring Tube

The Deep Hole Boring Tube is the core component of BTA (Boring and Trepanning Association) deep hole drilling systems. Designed for high-efficiency machining of deep holes with a depth-to-diameter ratio (D:d) ≥ 10:1, it is widely used in aerospace, energy, and automotive industries. It is compatible with both Single Tube (STS) and Double Tube (DTS/Ejector) systems, utilizing high-pressure coolant and rigid design to ensure stable chip evacuation.

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Description

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Core Positioning & Working Principle

Essence: A hollow tubular structure that works with specialized drill/boring heads to transmit cutting force, deliver high-pressure coolant, and evacuate chips.
Single Tube (STS/BTA): Coolant enters the cutting zone through the annulus between the tube OD and the hole wall; chips are evacuated through the tube’s inner bore. Requires workpiece sealing and a pressure head. Ideal for hole diameters 12–850 mm and depth ratios ≥ 100:1. Efficiency is 3–5 times that of gun drilling.
Double Tube (DTS/Ejector): Coolant flows through the annulus between the inner and outer tubes; chips are evacuated through the inner tube. No pressure head is required, making it adaptable to standard machine tools. Recommended max depth is 1000 mm (up to 2000 mm with special adapters), suitable for hole diameters 18–250 mm.

Key Structure & Materials

Component	Function	Typical Specifications
Tube Body	Transmits torque, delivers coolant, evacuates chips	OD: 16–300 mm, Wall Thickness: 3–20 mm, Length: 1–6 m
Connecting Thread	Connects to boring head/toolholder	Single/Multi-start thread (e.g., 4ST/1ST), Class 6g precision, compatible with ISCAR/UNISIG standards
Guide Pads	Ensures straightness and surface finish	Tungsten carbide inserts, Width: 5–15 mm, Clearance with hole: 0.01–0.03 mm
Material	Ensures rigidity and wear resistance	Alloy Steel (4140/4340), Nitrided/Chrome-plated surface, Hardness: HRC 30–45

Technical Parameters (General Reference)

Parameter Category	Single Tube (STS)	Double Tube (Ejector)	Remarks
Suitable Hole Diameter	12–850 mm	18–250 mm	Industry common range
Recommended Depth Ratio	≤ 200:1	≤ 100:1	Adjust based on machine rigidity & coolant system
Coolant Pressure	5–20 MPa	3–10 MPa	Ensures chip suspension during evacuation
Coolant Flow Rate	50–800 L/min	30–500 L/min	Increases with hole diameter and depth
Tube Straightness	≤ 0.02 mm/m	≤ 0.03 mm/m	Critical for hole straightness and cylindricity
Surface Roughness	ID Ra ≤ 1.6 μm	ID Ra ≤ 3.2 μm	Reduces risk of chip clogging
Connection Accuracy	Thread Runout ≤ 0.01 mm	Same as Left	Ensures concentricity and dynamic balance

Application Scenarios & Selection Guide

Suitable Materials: Carbon steel, alloy steel, stainless steel, titanium alloy, high-temperature alloys. Especially effective for materials that produce long, stringy chips.
Selection Criteria:
- Diameter/Depth: For holes < 18 mm, prioritize Single Tube. For depths > 1000 mm, prioritize Single Tube + Pressure Head.
- Machine Type: Use Double Tube for standard lathes/vertical machining centers; use Single Tube for dedicated deep hole machines.
- Efficiency: Single Tube offers higher efficiency; Double Tube offers greater flexibility.

Advantages & Operational Notes

Core Advantages: High depth-to-diameter ratio capability, high machining precision (Hole Tolerance IT7–IT9, Surface Ra ≤ 1.6 μm), smooth chip evacuation, and wide material adaptability.
Operational Notes:
- Coolant filtration precision should be ≤ 10 μm to prevent clogging.
- A pilot hole is required (Diameter = Boring Tube ID – 0.5 mm, Length ≥ 2x hole diameter).
- Control cutting parameters: Speed v = 30–100 m/min, Feed f = 0.1–0.3 mm/rev (adjust based on material).

Typical Specifications Example (UNISIG Standard)

Suitable Hole Diameter (mm)	Boring Tube OD (mm)	Boring Tube ID (mm)	Recommended Length (m)
20–30	19.05	15.00	1.5
31–40	28.58	22.00	2.0
41–50	38.10	30.00	3.0
51–65	50.80	42.00	4.0

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Products

The Ultimate Guide to Different Drill Bit Types: How to Choose the Right Tool for the Job

Dezhou Drillstar Cutting Tool Co., Ltd. officially resumed production amidst a festive and auspicious atmosphere.

Dezhou Drillstar Cutting Tool Co., Ltd. 2026 Year of the Horse Gala: A Resounding Success – Forging Precision, Riding the Wind of Progress

Deep Hole Boring Tube

Description

marker

Core Positioning & Working Principle

Key Structure & Materials

Technical Parameters (General Reference)

Application Scenarios & Selection Guide

Advantages & Operational Notes

Typical Specifications Example (UNISIG Standard)

Contact us

* Name

*Email

Phone / WhatsAPP / WeChat

* What I have to say.

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