API Oil Casing Pipe Coupling
1. Size: 4-1/2''-20''
2. End Type: BTC LTC STC
3. Steel Grade: J55, K55, N80-1, N80-Q, L80-9Cr/13Cr, C95, P110 ;
4. Specification: API Spec5CT& API 5B
5.Dimensions and their tolerances of tubing round-thread as per API spec 5ct & API 5B