Oil country tubular limited [octl] processes oil country tubular goods required for the oil drilling and exploration industry. Octl`s product range consists of drill pipe, heavy weight drill pipe, drill collars, production tubing, casing, tool joints, couplings, pup joints, nipples, subs, and cross overs. Oil country tubular limited has been assessed and certified by the american petroleum institute quality registrar [apiqr] as being in compliance with iso 9001:2000 quality system. Octl rotary subs include straight od subs, reduced section subs, cross over, bit subs, and kelly saver subs. The rotary subs are available in standard lengths of 36" or 48". Any other length can also be supplied. The following are its salient features:
1. octl rotary subs are made from aisi 4140/ 4145h modified alloy steel
2. fully heat treated to a brinell hardness range of 285 - 341
3. has an izod impact strength of minimum 40 ft-lbs.
4. connections are machined and finished according to api specification 7.
5. thread roots are cold rolled after machining and phosphatized to prevent galling during initial make-up.
6. rotary subs are shipped with pressed steel thread protectors installed.
