TSDS™
THE DEPENDABLE WORKHORSE
The Texas Steel Double Shoulder (TSDS™) connection is built as the dependable workhorse among double shoulder drill pipe connections for operators who want a clear step up from standard API threads without moving into the premium-connection category. Engineered by a drill pipe manufacturer with deep rotary shouldered experience, it's a rugged, reliable upgrade that supports smoother operations and fewer connection-related slowdowns, giving rigs a connection they can count on day after day.
DOUBLE SHOULDER DESIGN
Double shoulder drill pipe connections deliver substantially higher torque capacity than standard API designs because they engage two load-bearing shoulders instead of one, creating a stiffer, more stable torsional path. By distributing torque across both the primary and secondary shoulders, the design reduces thread shear, limits deformation, and maintains structural integrity under heavy cyclic loading, conditions where API threads begin to lose stiffness. This dual-shoulder geometry also improves make-up stability in high torque drill pipe connections.
SAME THREAD FORM, MORE TORQUE CAPACITY
With its reinforced secondary shoulder, TSDS™ reduces thread wear and delivers higher torque while maintaining the same make-up turns and staying compatible with existing standard API threadforms. Operators get more torque with the same turns and threads per inch they expect from standard API designs, the defining benefit of double shoulder drill pipe connections, elevating performance while staying fully interchangeable with existing API connections.
- Fully interchangeable with existing API connections.
- 5 to 6 turns to make-up; same as API connections.
- Two engaged shoulders instead of one.
- More stable make-up.
TSDS™ VS. STANDARD API
| FEATURE | TSDS™ | STANDARD API |
|---|---|---|
| Torque capacity | Higher | Baseline |
| Shoulders engaged | 2 (primary + secondary) | 1 (primary) |
| Make-up turns | 5 to 6 | 5 to 6 |
| Thread form | API-compatible | API |
HIGHER TORQUE AND GREATER STABILITY
For operators, TSDS™ means fewer torque-related slowdowns, more confidence in the string as drilling conditions intensify, and a stronger version of the API connection they already know and trust. That is what high torque drill pipe connections should deliver: the performance of a double shoulder design without a premium-connection price.
GLOBAL SERVICE NETWORK
As a drill pipe manufacturer with global reach, TSC supports your operation with a worldwide network of licensed service and repair centers. Less downtime. Longer pipe life. Lower Cost of ownership. Delivered anywhere you drill.
FIELD INSPECTION RESOURCES
Access TSDS™ field inspection technical documents to maintain peak performance in the field. Box and pin thread drawings, inspection dimensions, and make-up specifications for high torque drill pipe connections, all in one technical hub.
Frequently Asked Questions
What are double shoulder drill pipe connections?
A double shoulder connection uses two load-bearing shoulders instead of the single shoulder found on standard API rotary shouldered threads. The secondary shoulder acts as a torque stop, so the joint carries more torque before the threads reach their limit. TSDS™ brings that geometry to a standard API thread form, which is why double shoulder drill pipe connections are often the first upgrade operators make when API torque limits start holding back the drilling program.
How much more torque does TSDS™ handle than a standard API connection?
Torque capacity depends on tool joint OD, ID, and pipe size, so the gain is expressed per configuration rather than as a single figure. Across common sizes, high torque drill pipe connections built on a double shoulder design carry meaningfully more make-up torque than the equivalent API connection at the same dimensions. Request the TSDS™ torque tables for double shoulder drill pipe connections from your drill pipe manufacturer contact for the exact values on your string.
Is TSDS™ compatible with our existing API threadforms?
Yes. TSDS™ keeps the same thread form, threads per inch, and make-up turns as the standard API connection it is based on, so it runs interchangeably with existing API tool joints in the string. Crews do not need new running procedures and rig floor handling stays the same. That interchangeability is what separates TSDS™ from premium double shoulder drill pipe connections that require dedicated equipment.
When should we upgrade from an API connection to a double shoulder design?
Consider the upgrade when torque demand climbs: extended-reach laterals, high dogleg severity, longer strings, or repeat make-up and break-out cycles that wear threads faster. If your program is regularly bumping against API torque limits or seeing connection-related downtime, high torque drill pipe connections are usually the most cost-effective fix before moving to a full premium connection.
Where can TSDS™ connections be inspected, recut, or repaired?
TSC maintains a worldwide network of licensed service and repair centers qualified to inspect and recut TSDS™ threads to specification. Field inspection drawings, inspection dimensions, and make-up specifications are published in the technical hub so your inspectors can verify double shoulder drill pipe connections on site. Working with a licensed drill pipe manufacturer network keeps repairs within tolerance and protects pipe life.
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DESIGN YOUR TSDS™ SOLUTION
A stronger version of the API connection you already know and trust. Configure your spec or talk to a TSDS™ expert about double shoulder drill pipe connections for your next well.
