WITSML - Tubular Connection Component Schema Internal diameter of object. Outside diameter of the body of the item. Length of the item. Thread type from API RP7G, 5CT. Thread size. Yield stress of steel - worn stress. Torque yield stress. Where connected. For bending stiffness ratio. Leak pressure rating. Make up torque. A container element that can contain custom or user defined data elements. Unique identifier for the connection.