FAQ · Specifications
Drill Pipe Specs & Standards FAQs
Grades, connections, dimensions and the standards behind drill string tubulars.
What are the common drill pipe grades?
The standard API 5DP grades are E-75, X-95, G-105 and S-135, where the number is the minimum yield strength in thousands of psi. E-75 suits shallow, low-load wells while S-135 is used for deep, high-torque and extended-reach wells.
What is the difference between range 1, 2 and 3 drill pipe?
Range lengths describe the joint length: Range 1 is 18–22 ft, Range 2 is 27–30 ft (the most common), and Range 3 is 38–45 ft. Range 3 reduces the number of connections and speeds up tripping on deeper wells.
What is a tool joint?
A tool joint is the threaded, forged connection welded to each end of a drill pipe tube — a box on one end and a pin on the other — that lets joints be screwed together into a string and carries the make-up torque.
API vs premium connections — what's the difference?
API connections (e.g. NC38, NC50) are standardized single-shoulder threads suitable for most drilling. Premium double-shoulder connections add a secondary torque shoulder for higher torque capacity and better fatigue life in extended-reach and high-torque wells.