Bent sub is special sub manufactured in 4145H or 4330V or Non-mag P500 series material. This sub has two different sytles. One with adjustable bend ring and one with direct bend in the sub. Adjustable ring can be used to alter the bend from 0 deree to 4 degree. useally oil and gas sector uses 1.5* bend and HDD sector suing 1.7* bend. the positioning of this sub is in between mud motor rotar and the drive shaft. bend sub can be also used in Rock hammer system where the bed can be adjusted to the sonde location and by which drilling in rock with rockmaster hammers can be easily possible.A bend sub is a type of downhole tool used in the oil and gas industry during drilling operations. It is a short, threaded pipe fitting that is designed to bend or deflect the drill string to a specific angle or direction.

Bend subs are typically used when drilling directional wells, where the wellbore needs to be drilled at an angle or in a specific direction. The bend sub is typically placed near the bottom of the drill string and is used to direct the drill bit to the desired angle or direction.

The bend sub is typically made from high-strength materials, such as alloy steel, to withstand the high stresses and pressures of drilling operations. It is designed to bend or deflect the drill string without causing damage to the drill string or other downhole tools.

Bend subs come in various sizes and configurations, depending on the specific requirements of the drilling operation. They can be designed to bend the drill string to a specific angle or direction, or they can be adjustable to allow for changes in the drilling direction during the operation.

Overall, the bend sub plays a critical role in directional drilling operations, as it enables the efficient and accurate drilling of the wellbore in a specific direction or angle, reducing the need for multiple drilling operations and increasing the productivity of the well.