High-Precision Drill Stem Subs from China Suppliers - API 7-1 Compliant Factory with OD 2 7/8 to 14
Product Application
Drill stem subs serve as critical components in drilling operations, acting as connectors between drill pipes and drill collars. Each sub features a drill pipe connection on one end and a drill collar connection on the other, enabling seamless integration of drilling equipment.
Crossover subs, a specialized type of sub, are designed to adapt to different connector types or sizes and connections.
The sub that connects the drill bit to the last drill collar is the bit sub.
Types of Sub
There is a wide range of subs available to meet the specific needs of modern drilling operations:
- Straight Crossover Sub (Box/Pin, Box/Box, Pin/Pin)
- Crossover Sub with Float Bore (Box/Pin, Box/Box, Pin/Box)
- Bit Sub (Box/Box)
- Top Drive Saver Sub (Pin/Pin)
- Kelly Saver Sub without rubber protector (Box/Pin)
- Kelly Saver Sub with a stretched on rubber protector (Box/Pin)
- Lift Sub (18 deg taper or squa
- Lift Plug (None/Pin)
Product Features
Premium Materials
We utilize only the highest quality, fully traceable 4145-H heat-treated alloy steel bars, ensuring superior mechanical properties in strict accordance with API and NS-1 standards. For applications demanding enhanced wear resistance and torsional strength.
Precision Threading
Threads are cold rolled to ensure a perfect fit and maximum strength. Standard phosphating of threads and seals providesexceptional anti-corrosion and anti-galling protection, minimizing the risk of galling during initial makeup.
Customized Solutions
We offer customized drawings and detailed product data tables upon request, enabling our clients to make informed decisions and select the perfect subs for their specific needs.
Frequently Asked Questions
Q:
What is the primary function of drill stem subs?
A:
Drill stem subs act as critical connectors between drill pipes and drill collars in drilling operations, enabling seamless equipment integration.
Q:
What is a crossover sub used for?
A:
A crossover sub is a specialized component designed to adapt to different connector types, sizes, and connections within the drill string.
Q:
Which sub connects the drill bit to the drill collar?
A:
The bit sub is specifically used to connect the drill bit to the last drill collar in the assembly.
Q:
What quality standards do your materials meet?
A:
We utilize fully traceable 4145-H heat-treated alloy steel bars that strictly comply with API and NS-1 standards for superior mechanical properties.
Q:
How do you protect the threads from corrosion and galling?
A:
Threads are cold rolled and undergo standard phosphating on both threads and seals to provide exceptional anti-corrosion and anti-galling protection.