T38 Coupling Sleeve Description
T38 Coupling Sleeve is a critical connection component used in Top Hammer Rock Drilling systems, designed to join T38 drill rods efficiently and securely.
This middle stop coupling sleeve ensures accurate rod alignment, stable energy transmission, and reduced thread wear during high-impact drilling operations.
Manufactured from 22CrNi3Mo alloy steel and advanced 20-hours heat-treatment, the T38 coupling sleeve offers excellent resistance to wear, fatigue, and deformation, even under severe drilling conditions such as mining, quarrying, tunneling, and construction drilling.
With standard R38 / T38 threads, this coupling sleeve is fully compatible with most international top hammer drilling tools and drill rigs.
Key Features
Standard T38 / R38 Thread
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Compatible with most top hammer rock drilling systems worldwide
Middle Stop Design
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Ensures precise rod positioning and balanced stress distribution
High-Strength Alloy Steel
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22CrNi3Mo:Excellent toughness and impact resistance
Precision Machining
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Accurate thread profile for tight connection and easy make-up
Optimized Heat Treatment
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20 hours in total:Improved wear resistance and extended service life
Stable Energy Transmission
Minimizes power loss between drill rods
Specification
| Type | Length (mm / inch) | Diameter (mm / inch) | Thread Type | Product Code | Weight (kg) |
|---|---|---|---|---|---|
| Middle Stop T38 | 170 / 6 11/16 | 55 / 2 5/32 | R38 | 302-5517-5656 | 1.8 |
| Middle Stop T38 | 190 / 7 1/2 | 55 / 2 5/32 | T38 | 302-5519-7676 | 2.0 |
| Reduction T38 to R32 | 170 / 6 3/4 | 55 / 2 5/32 | R32 / R38 | 303-5517-5456 | 1.7 |
| Reduction T38 to R32 | 190 / 7 1/2 | 55 / 2 5/32 | R32 / T38 | 303-5519-5476 | 2.0 |
Applicantions of T38 Coupling Sleeve
The T38 Coupling Sleeve is widely used in:
Mining drilling operations
Quarry and aggregate production
Tunnel and underground excavation
Construction and foundation drilling
Bench drilling and production drilling
Suitable for Top Hammer Rock Drilling Tools, especially when connecting T38 drill rods in medium to hard rock formations.
Maintenance & Usage Recommendations
To maximize the service life of your T38 Coupling Sleeve, we recommend:
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Clean threads regularly to prevent dust and rock debris accumulation
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Apply proper thread grease before installation
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Avoid over-tightening to reduce thread stress
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Inspect threads periodically for wear or deformation
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Replace coupling sleeves when excessive thread wear is detected
Proper maintenance can significantly improve drilling efficiency and reduce total operating costs.
Packaging & Marking
All Rock Drill Couplings are packed in export-standard wooden cases.
Shock-resistant
Moisture-proof
Suitable for long-distance sea transportation
Ensures products arrive safely at the customer’s site
Custom marking or stamping services available(100*100mm)
Related Production About T38
FAQ
A coupling sleeve is used to connect two drill rods in a top hammer rock drilling system.
It ensures stable energy transfer from the drill to the rock while maintaining accurate alignment of the drill rods during drilling operations.
T38 Coupling Sleeve is a middle stop coupling sleeve designed specifically for T38 thread drill rods.
It is widely used in mining, quarrying, tunneling, and construction drilling where top hammer drilling tools are applied.
A middle stop coupling sleeve has an internal shoulder in the center of the sleeve.
This design ensures:
Equal engagement of both drill rods
Better stress distribution
Reduced thread wear
Improved drilling stability
Yes.
T38 and R38 refer to the same thread specification in top hammer drilling tools.
They are often used interchangeably in the rock drilling industry.
Common sizes include:
Length: 170 mm (6 11/16 inch)
Length: 190 mm (7 1/2 inch)
Outer Diameter: 55 mm (2 5/32 inch)
Thread: T38 / R38
To select the correct coupling sleeve, consider:
Drill rod thread type (T38, R32, T45, etc.)
Required sleeve length
Drilling conditions and rock hardness
Compatibility with your top hammer drill rig
To extend coupling sleeve life:
Clean threads before connection
Apply thread grease regularly
Avoid cross-threading
Do not over-tighten
Replace worn sleeves in time
Yes.
Coupling Sleeve T38 can be customized in terms of:
Length
Material grade
Heat treatment
OEM branding
Customization is suitable for bulk orders and OEM supply.
Yes.
Coupling Sleeve T38 is manufactured according to international drilling standards and is compatible with most global top hammer rock drilling tool brands.