API Drill Pipe: 1. API 5D, API SPEC 7 Standard; 2. Steel Grades: E-75, X-95, G-105, S-135; ... Our Drill Pipes for oilfield equipment: 1)Sizes: OD 2 3 ... /8", 2 7/8", 3 1/2", 4", 4 1/2", 5", 5 1/2" ; 2)Standard: API SPEC 5D, API ... SPEC 7;3)Type of end ...