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 ... & external upset;4)Steel Grades: E-75, X-95, G-105, S-135.5)Hardbanding and Internal coating is available. Drill Pipe