T2 / T6 Impregnated Diamond Core Bit - Drilling Bits - Ch...

T2 / T6 Impregnated Diamond Core Bit

Product Type: Impregnated Diamond Core Bit
System: T2 / T6 Metric
Core Barrel: Conventional Double Tube
Cutting Material: Impregnated Diamond Matrix
Utilisation : Geological / Geotechnical / Core Sampling
Matrix Hardness: Selected according to formation
Waterways: Customizable
Crown Profile: Customizable

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Description

Product Snapshot

T2 / T6 Impregnated Diamond Core Bit for Conventional Double-Tube Core Drilling

The T2 / T6 Impregnated Diamond Core Bit is designed for conventional double-tube core drilling in geological exploration, geotechnical investigation and rock sampling applications.

Industrial diamonds are distributed throughout a sintered or infiltrated metal matrix at the cutting crown. As the matrix gradually wears during drilling, new diamond particles are exposed, allowing the bit to maintain cutting capability over its service life. T2 and T6 systems are available in several metric sizes and are used with matching conventional double-tube core barrels.

Product Type Impregnated Diamond Core Bit	System T2 / T6 Metric	Core Barrel Conventional Double Tube
Cutting Material Impregnated Diamond Matrix	Application Geological / Geotechnical / Core Sampling	Matrix Hardness Selected according to formation

Customization

Matrix Hardness / Diamond Grade & Concentration / Crown Height / Crown Profile / Waterway Design / Coreliner Configuration / OEM Marking

Key Features

Self-renewing diamond cutting for double-tube core drilling

Six design advantages behind the T2 / T6 Impregnated Diamond Core Bit.

01 / 06

Impregnated Diamond Matrix

Diamond particles are embedded throughout the metal matrix rather than placed only on the surface. As the crown wears, fresh diamonds are exposed, helping maintain continuous cutting action.

02 / 06

Designed for Double-Tube Core Drilling

T2 and T6 bits are designed to work with matching conventional double-tube core barrel systems.

03 / 06

Multiple Metric Sizes

T2 and T6 systems cover a range of hole and core diameters for different geological and geotechnical projects.

04 / 06

Matrix Hardness Options

Different matrix formulations can be selected according to rock hardness and abrasiveness.

05 / 06

Custom Crown & Waterways

Waterway design, crown profile and matrix configuration can be customized according to drilling conditions.

06 / 06

Self-Renewing Cutting Principle

Controlled matrix wear continuously exposes new diamond particles, maintaining cutting capability throughout the useful crown depth.

Applications & Formations

Used across geological, geotechnical and mineral core drilling

T2 / T6 impregnated diamond core bits are suitable for geological exploration, geotechnical investigation, mineral exploration, rock core sampling, engineering geological drilling, foundation investigation, environmental investigation and conventional core drilling.

01 Geological & Mineral Exploration Core sampling for geological mapping, mineral exploration and deposit evaluation.	02 Geotechnical & Foundation Investigation Geotechnical investigation, foundation investigation and engineering geological drilling.
03 Rock Core Sampling Continuous core recovery for laboratory testing and formation analysis.	04 Environmental & Conventional Core Drilling Environmental investigation and conventional core drilling with matching double-tube core barrels.

Suitable Rock Formations

Formation Type	Recommended
Sedimentary & Metamorphic	Sandstone, limestone, dolomite, shale, slate, marble, gneiss, quartz-bearing formations.
Formation Hardness	Medium-hard to hard rock, depending on the selected matrix hardness and crown design.
Important Note	Final matrix selection should be based on rock hardness, abrasiveness, fracture condition and drilling parameters. One matrix formulation is not suitable for all formations.

⚠️ Note: For harder and more abrasive formations, a matched matrix formulation and diamond exposure are usually required.

Working Principle

How an impregnated diamond bit works

The cutting crown contains fine synthetic diamond particles distributed throughout a metal matrix. The controlled wear mechanism helps maintain the cutting capability of the bit throughout its useful crown depth.

Diamond particles contact and grind the rock.

The matrix gradually wears.

Worn or rounded diamond particles are released.

New sharp diamonds become exposed.

Note: This self-renewing cutting principle is a defining feature of impregnated diamond core bits. The matrix should wear at a controlled rate so that new diamonds are exposed continuously.

T2 Series Technical Specifications

T2 metric sizes and dimensions

The following dimensions are cross-checked against common public T2 technical data. Actual manufacturing tolerances should be confirmed before ordering.

Model	Outside Diameter	Inside Diameter
T2-56	56.13–55.88 mm	41.83–41.58 mm
T2-66	66.12–65.87 mm	51.81–51.56 mm
T2-76	76.12–75.87 mm	61.82–61.57 mm
T2-86	86.13–85.88 mm	71.83–71.58 mm
T2-101	101.12–100.87 mm	83.82–83.57 mm

Coreliner Options: Some T2 specifications are also available in Coreliner versions, such as T2-76 Coreliner, T2-86 Coreliner and T2-101 Coreliner. Coreliner models have different inside diameters and must not be interchanged with standard T2 models.

T6 Series Technical Specifications

T6 metric sizes and dimensions

The following dimensions are cross-checked against multiple public T6 technical sources. A known erroneous T6-146 outside diameter value has been excluded.

Model	Outside Diameter	Inside Diameter
T6-76	76.12–75.87 mm	57.12–56.87 mm
T6-86	86.13–85.88 mm	67.13–66.88 mm
T6-101	101.12–100.87 mm	79.12–78.87 mm
T6-116	116.20–115.82 mm	93.14–92.89 mm
T6-131	131.19–130.81 mm	108.13–107.88 mm
T6-146	146.18–145.80 mm	123.11–122.86 mm

Note: T6-146 dimensions are approximately 146.18–145.80 mm outside diameter. A value of 479.18 mm appearing in some sources is clearly a data entry error and has not been used.

T2 vs T6

T2 vs. T6 Diamond Core Bit

T2 and T6 cannot be treated as identical simply because they share a nominal size number. Their core diameters differ at the same nominal outside diameter.

Feature	T2 Series	T6 Series
Core Barrel Type	Conventional Double Tube	Conventional Double Tube
Size Range	Smaller to medium	Medium to larger
Typical Models	56 / 66 / 76 / 86 / 101	76 / 86 / 101 / 116 / 131 / 146
Core Diameter	Generally larger relative to hole size	Smaller relative core diameter at same nominal size
Application	Geological & geotechnical coring	Geological & geotechnical coring
Crown Type	Impregnated / other options depending on system	Impregnated / other options depending on system

Example: At approximately 76 mm outside diameter, T2-76 inside diameter is about 61.8 mm, while T6-76 inside diameter is about 57.1 mm. T2 and T6 cannot be treated as identical simply because both are labelled “76”.

Matrix Selection

Diamond matrix hardness selection

Different matrix hardness levels can be selected according to formation hardness and abrasiveness. The purpose of matrix selection is to let the matrix wear at an appropriate rate so that new diamond particles are continuously exposed.

Low Hardness

Low Matrix Hardness

Selected for softer or less abrasive formations where the matrix needs to wear faster to expose new diamonds.

Medium Hardness

Medium Matrix Hardness

A general-purpose option for a range of medium-hard formations and mixed drilling conditions.

High Hardness

High Matrix Hardness

Selected for harder or more abrasive formations where slower matrix wear is required.

💡 Selection Principle:
A harder formation does not automatically mean a harder matrix. Matrix selection should consider rock hardness, abrasiveness and the rate of cutting wear together. The goal is to make the matrix wear at an appropriate speed so that new diamond particles are continuously exposed — not simply to make the matrix as hard as possible.

Crown Profiles & Waterways

Available crown profiles and flushing design

Crown profile and waterway design affect cuttings removal, crown cooling and drilling efficiency. Both can be customized according to formation characteristics and drilling method.

Flat Profile A general crown profile for conventional double-tube core drilling.	Semi-Round Profile A rounded crown shape for different formation engagement characteristics.	Stepped Profile A stepped crown design for specific formation and drilling conditions.
Turbo / Segmented Profiles Segmented crown designs for specific penetration and flushing requirements.	Reinforced Crown Reinforced crown configurations for more demanding drilling conditions.	Customized Crown Shape Crown shape can be customized according to project requirements.

Waterways & Flushing: Proper flushing is critical in diamond core drilling. Optimized waterways help cool the diamond crown, remove drilling cuttings, reduce clogging, carry fines away from the cutting face and maintain drilling efficiency. Waterway width, number and shape can be customized according to bit diameter and drilling conditions.

Note: Final crown profile should be selected according to formation characteristics and drilling method.

Double-Tube Core Drilling

Designed for conventional double-tube core barrels

T2 and T6 systems are conventional double-tube core drilling systems. The outer tube transmits rotation and drilling load, while the inner tube receives the recovered rock core.

Outer Tube

Outer Tube Function

The outer tube transmits rotation and drilling load to the bit during core drilling.

Inner Tube

Inner Tube Function

The inner tube receives the recovered rock core. This arrangement helps protect the core from direct contact with the rotating outer barrel compared with single-tube drilling.

Recommended for: Geological core sampling, geotechnical investigation and formation analysis, where reliable core recovery and representative samples are required.

Customized Manufacturing

Customized T2 / T6 diamond core bits

Every core drilling project is different. We can customize the T2 / T6 diamond core bit according to your core barrel system, formation and drilling requirements.

From T2 / T6 model and matrix hardness to crown profile and waterway design, core bits can be configured according to specific project conditions. Our engineering team works with your technical data to recommend the most suitable matrix and crown configuration.

— T2 / T6 Model	— Matrix Hardness
— Diamond Grade & Concentration	— Crown Height
— Crown Profile	— Waterway Design
— Coreliner Configuration	— OEM Marking

CNC machining of diamond core bit components

Note: Crown height is available as a customized option. Specific crown height availability should be confirmed according to the T2 / T6 model and product design.

How to Select

How to select the correct T2 / T6 bit

For an accurate recommendation, please provide the following information. If the exact model is uncertain, send us your current core barrel or drill bit dimensions and our team can help identify the correct size.

01 Core Barrel System T2 or T6.	02 Bit Model T2-76 / T6-101 etc.	03 Rock Formation & Hardness Rock type, formation hardness and abrasiveness.
04 Drilling Depth Planned drilling depth and drilling conditions.	05 Current Bit Matrix If known.	06 Core Barrel Photos or Drawings If the exact model is uncertain.

💡 Not sure whether your core barrel uses T2 or T6 dimensions?
Send us the current drill bit dimensions or a photo of the core barrel connection. Our team can help match the correct core bit configuration.

About Chenghui Drilling

Professional drilling tools manufacturer in China

Chenghui Drilling supplies diamond core drilling tools for geological exploration, geotechnical investigation, mining and engineering drilling.

Our product range includes T2 / T6 Diamond Core Bits, BQ / NQ / HQ / PQ Core Bits, PDC Core Bits, Reaming Shells, Tricone Bits and DTH Drilling Tools. Different bit sizes, matrix formulations, crown profiles and waterways can be manufactured according to drilling requirements.

Supply Mode Factory Direct	Fabrication In-House
Service OEM / ODM	Market Global Export

Chenghui Drilling Tools production workshop

Get In Touch

Need a T2 or T6 Diamond Core Bit?

Send us your T2 / T6 model, formation, rock hardness and drilling depth. If the exact model is unknown, send us the outside diameter, inside diameter and a core barrel photo. Our team can help match the correct core bit configuration.

1. T2 / T6 Model	2. Rock Formation & Hardness
3. Drilling Depth	4. Core Barrel Photo / Dimensions (if model unknown)

📩 Request a Quote
Send Core Barrel Dimensions

FAQ

1
What is a T2 / T6 impregnated diamond core bit?
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It is a diamond core bit designed for conventional metric double-tube core drilling systems. Diamond particles are distributed throughout a metal matrix that gradually wears to expose new cutting diamonds.

2
What is the difference between T2 and T6 core bits?
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T2 and T6 use different dimensional systems and core diameters. For example, T2-76 and T6-76 have similar outside diameters but different inside diameters and therefore recover different core diameters.

3
What sizes are available?
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Common T2 sizes include 56, 66, 76, 86 and 101, while common T6 sizes include 76, 86, 101, 116, 131 and 146.

4
How do I select the correct matrix hardness?
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Matrix selection depends on rock hardness, abrasiveness and drilling conditions. Please provide geological information so the matrix can be matched to the formation.

5
Can crown profile and waterways be customized?
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Yes. Crown shape, matrix configuration and waterway design can be customized according to formation and drilling requirements.