EN ISO 10424-2:2007, published by CEN and identical to ISO 10424-2:2007, defines requirements for threading and gauging of rotary shouldered thread connections used in the petroleum and natural gas industries. The standard addresses dimensional requirements for threads and thread gauges, gauging practice, gauge specifications, and the instruments and methods for inspection of rotary shouldered connections intended primarily for drill‑string components.
Key points:
- Applies to preferred rotary shouldered connection designs: NC (number) style, REG (regular) style, and FH (full hole) style.
- Provides traceability to an internationally supported system of gauges and calibration.
- Uses both SI and USC units; products manufactured to either system are considered equivalent and interchangeable.
Key topics and technical requirements
EN ISO 10424-2 covers the core technical areas required for consistent, safe, and interchangeable rotary shouldered connections:
- Thread profile and dimensional requirements - definitions of mating thread geometry and acceptable manufacturing forms.
- Gauging practice and gauge specifications - design, contact points, and relationships among master, regional, and working gauges.
- Inspection instruments and methods - recommended procedures for measuring thread height, taper, lead and stand‑off.
- Gauge calibration and certification - calibration systems, acceptance criteria and certification processes to ensure gauge traceability and accuracy.
- Optional product features and finishing - stress‑relief features, surface treatments, benchmarks and cold working where agreed between parties.
- Annexes and informative guidance such as care/use of master gauges, recommended gauging practice, USC/SI conversion tables and API gauge relationships.
Practical applications and users
This standard is practical for organizations and professionals involved in the design, manufacture, inspection and operation of drill‑string components:
- Manufacturers of drill collars, subs, and other rotary drilling components - use the standard to ensure thread interchangeability and quality control.
- Inspection and calibration laboratories - follow gauging, measurement methods and ISO/IEC 17025 competence requirements for gauge calibration.
- Oilfield operators and drilling contractors - use the standard to specify connection acceptance criteria and compatibility.
- Quality assurance, procurement and R&D teams - adapt supplementary specifications for special tolerances, testing, qualification and finishing.
Related standards
- ISO 10424-1 - Rotary drill stem elements
- ISO 11961 - Steel drill pipe
- ISO/IEC 17025 - Competence of testing and calibration laboratories
- API Spec 7 - Specification for rotary drill stem elements (informative foundation for ISO 10424-2)
EN ISO 10424-2:2007 is essential for ensuring reliable, interchangeable rotary shouldered connections through standardized threading, gauging, inspection and calibration practices in petroleum and natural gas drilling operations.