Our company manufactures a complete line of rotary subs. Each sub provides a connection between joints of different size or type of drilling, washover, or tubing strings. Cross-over subs may be used in applications when it is necessary to have frequent disconnection points. All DX subs are manufactured from high-alloy, heat treated steel and thread to the customer's specifications. Subs can be ordered pin-to-pin, box-to-box, or box-to-pin and are available in lengths up to 96 inches. Right or Left-hand threads can be provided.
There are A type (same diameter)，B type (different diameter) and C type (levoform).
