High Performance 3.5" Rock Drilling Solution

DHD 3.5 DTH Drill Bit

Ideal for water wells, construction, civil engineering & medium-hard rock. Long life & stable drilling.

Product Overview

The DHD 3.5 DTH drill bit is a widely used 3.5" rock drilling tool compatible with DHD series hammers. It is ideal for water well drilling, geological exploration, and medium-hard rock drilling. With optimized button design and durable alloy, it delivers higher penetration rates and longer service life.

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Key Features & Benefits

The DHD 3.5 drill bit consistent results across a wide range of drilling applications.

High Drilling Efficiency

The optimized button layout improves rock fragmentation, increasing penetration rate in soft to medium-hard rock.

Longer Service Life

Premium alloy and advanced heat treatment reduce wear and extend bit life, lowering drilling costs.

Stable Hole Quality

Balanced structure and accurate machining reduce deviation and improve hole straightness.

Strong Compatibility

Designed to fit standard DHD 3.5 hammers and common drilling rigs.

Application Scenarios

Water Well Drilling

Ideal for water well projects in soft, mixed, and moderately compact formations.

Construction

Used for foundation drilling, pile hole drilling, and geotechnical investigations.

How to Choose the Right DHD 3.5 Drill Bit

Selecting the correct DHD 3.5 DTH drill bit is key to maximizing drilling efficiency, extending bit life, and achieving stable hole quality. The right choice depends on hammer compatibility, button type, bit face design, and operating parameters.

Step 1 — Check Your DTH Hammer Compatibility

Before anything else, confirm that your DTH hammer is part of the DHD 3.5 series or fully compatible. Using a mismatched hammer and bit can cause premature wear, reduced penetration, and potential tool failure.

Step 2 — Choose the Right Button Type

The button type determines how efficiently the bit breaks rock. Selecting the proper button type based on rock hardness, abrasiveness, and fracturing is critical.

Spherical Buttons

Best for: Medium-hard rock with high abrasiveness

Advantages:

Excellent wear resistance
Longer service life
Lower risk of button breakage

Ballistic (Semi-Ballistic) Buttons

Best for: Medium-hard rock that is relatively brittle but not highly abrasive

Advantages:

Higher penetration rate
Faster drilling speed
Lower energy consumption

Step 3 — Choose the Right Bit Face Design

The bit face design affects hole stability, drilling speed, and overall efficiency. Choose based on rock formation and project depth.

Flat Face

Best for: All rock conditions, especially fractured, fissured, and mixed formations
Benefit: Maintains penetration in uneven rock layers

Concave Face

Best for: Deep hole drilling
Benefit: Improves hole alignment through inverted pilot design

Convex Face

Best for: Hard, abrasive rocks
Benefit: Strong design provides a balance of fast drilling and long bit life

Step 4 — Match Air Pressure & RPM

For optimal drilling performance, ensure your rig matches the recommended air pressure and RPM for the DHD 3.5 bit.

Low air pressure: insufficient impact energy, poor penetration
Excessive pressure: increased wear, shortened bit life
Proper matching ensures maximum energy transfer, stable hole quality, and longer service life.

Quality Assurance & Manufacturing

Precision machining for accurate dimensions and balance
Advanced heat treatment for strength and toughness
Wear-resistant alloy for longer life
Strict quality inspection: hardness testing, dimension check, and balance test

Frequently Asked Questions

Do you offer customized tooth design?

Yes, we can customize tooth layout, material, and connection based on your project.

How do I know if my DTH hammer is compatible?

Check the model of your DTH hammer. If it belongs to the DHD 3.5 series, it is compatible.
Note: Pay attention to whether your DTH drill bit has a tail tube. Bits with tail tubes require specially designed DTH hammers for proper fit.

Why Are Hemispherical Buttons Better for Highly Abrasive Rock?

Highly abrasive rock often has a high quartz content, which causes rapid wear on alloy materials. In such formations, conical buttons tend to:
1. Dull very quickly
2. Experience tip chipping
3. Lose drilling efficiency sharply as their shape changes
4. Sometimes leads to premature drill bit failure
Hemispherical buttons, on the other hand:
1. Are naturally “blunt,” so shape changes from wear are minimal
2. Have strong resistance to chipping
3. Last much longer in highly abrasive rock than conical buttons
4. Deliver more stable impact energy
For these reasons, in both DTH drill bits and top hammer drill bits, hemispherical buttons are almost always preferred for rock that is both highly abrasive and hard.

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