The coupling materials of each coupling are from large domestic well-known steel mills that have passed API certification. Ensure that the material of each coupling meets the various steel grade indicators specified in the API standard. Produced strictly in accordance with API SPEC 5CT and 5B Specifications of the American Petroleum Institute,
1) The thread processing adopts advanced CNC lathes, and the forming comb is completed. 2) The processed products undergo geometric dimensions, thread inspection (tooth height, taper, close pitch, pitch), casing coupling, non-destructive testing, impact test testing, and mechanical performance testing. 3) Product surface treatment, 4) Product packaging and delivery.