All sizes and configurations
Command Tubular manufactures drill stem substitutes to API Spec 7-1 subs in the size range 2 7/8” large OD thru 14” large OD, 110,000 KSI – 130,000 KSI
Our subs are supplied in the following standard configurations:
- Straight OD
- Reduced section, bottleneck
- Swivel sub
- Lift sub
Upon request, any of the following subs can be supplied in any OD/ID and configuration:
- Crossover sub
- Bit sub c/w float recess/ baffle plate recess
- Saver sub
- Top drive sub
- Circulating sub
- Casing Running Subs
- Special application subs
The Highest Quality
The highest quality and traceable 4145-H heat treated alloy steel bars are used to ensure optimum mechanical properties per API or NS-1. Upon request, as necessary, higher alloy steel with higher mechanical properties is available for increased wear resistance / torsional strength.
All subs have unique serialization permanently marked with traceability to all manufacturers’ certified data meeting the specification requested.
All API numbered, other common standard connections and Command Tubular proprietary CET™ and CDS™ double shouldered are machined on the latest CNC lathes. The threads of rotary shouldered, casing, tubing, line pipe and ACME connections are verified using all required precision gauges including working rings and plugs certified to API or proprietary master gauges.
Threads can be cold rolled per NS-1 requirements. Phosphating of threads and seals is the standard anti-corrosion / anti-galling method used that minimizes galling on initial makeup.
When requested, threads of rotary shouldered connections can be made up and broken to a specified percent of the maximum make up torque for a specified number of cycles (typically 3). This ensures optimum running performance without galling, particularly at the critical initial trip.
Note: Drawings and product data tables are available on request.