Drill Pipe

Drill pipes are accorded with API spec 5DP.The drill pipe undergo a full-length inspection that checks the defects, especially the strict inspections on weldneck/upset region are preformed with our both manual and automatic inspection equipments to ensure the high quality.

And the thread is the most important factor for drill pipes, all threads would be machined with CNC Lathes and inspected with related thread gauges in conformance with API Specification.
Standard sizes for drill pipes

Size	Weight Designation	Wall Thickness		Grade	Outside Diameter		Calculated Plain-End weight		Upset Ends. For Weld-on Tools Joint
Size	Weight Designation	In	Mm	Grade	In	Mm	Lb/ft	Kg/m	Upset Ends. For Weld-on Tools Joint
23/8	6.65	0.280	7.11	E,X,G,S	2.375	60.3	6.27	9.33	EU
27/8	10.40	0.362	9.19	E,X,G,S	2.875	73.0	9.72	14.47	IU / EU
31/2		0.254	6.45	E	3.500	88.9	8.81	13.12	IU / EU
31/2	13.30	0.368	9.35	E,X,G,S	3.500	88.9	12.32	18.34	IU / EU
31/2	15.50	0.449	11.40	E	3.500	88.9	14.64	21.79	IU / EU
31/2	15.50	0.449	11.40	X,G,S	3.500	88.9	14.64	21.79	EU / IEU
4	14.00	0.330	8.38	E,X,G,S	4.000	101.6	12.95	19.27	IU / EU
41/2	13.75	0.271	6.88	E	4.500	114.3	12.95	18.23	IU / EU
41/2	16.60	0.337	8.56	E,X,G,S	4.500	114.3	15.00	22.32	EU / IEU
41/2	20.00	0.430	10.92	E,X,G,S	4.500	114.3	18.71	27.84	EU / IEU
5	16.25	0.296	7.52	X,G,S	5.000	127.0	14.88	22.16	IU
5	19.50	0.362	9.19	E	5.000	127.0	17.95	26.70	IEU
5	19.50	0.362	9.19	X,G,S	5.000	127.0	17.95	26.70	EU / IEU
5	25.60	0.500	12.70	E	5.000	127.0	24.05	35.80	IEU
5	25.60	0.500	12.70	X,G,S	5.000	127.0	24.05	35.80	EU / IEU
51/2	21.90	0.361	9.17	E,X,G,S	5.500	139.7	19.83	29.52	IEU
51/2	24.70	0.415	10.54	E,X,G,S	5.500	139.7	22.56	33.57	IEU
65/8	25.20	0.330	8.38	E,X,G,S	6.625	168.3	22.21	33.04	IEU
65/8	27.70	0.362	9.19	E,X,G,S	6.625	168.3	24.24	36.06	IEU