Drilling Pipe OD of Drill Pipe: 4 1/2" API 5DP Standard. Length: R2 Drilling PipeFriction Welding Drill Pipe and Joints1. Steel Grade: G105, S135, E75, X952. OD of Drill Pipe: Φ60, Φ73, Φ89, Φ114, Φ127 2 3/8” 2 7/8” 3 1/2” 4 1/2” 5”3.Standard: API 5DP 4. Packing: in Bundles 5. Joint Material: 35CrMo, 4137H Grade G105 Drilling Pipe