Suitable for drilling medium to deep blast holes in open-pit engineering projects such as mining, quarrying, railway, transportation, water conservancy, building materials, and military applications, performing highly efficient rock drilling operations. Also widely used for anchor bolt support, channel excavation, and sewer engineering drilling operations.

This model is equipped with a dual-motor rotation head and multi-way valve with adjustable rotation speed. The rotational torque can reach 1950N.m, meeting the requirements for 76mm drill rods and 130mm hole diameter. The maximum rotation speed can reach 150 RPM, satisfying some customers' needs for high-speed drilling in soft rock formations. At the same time, the 420B series models come standard with engineering tracks and plunger motors, providing stronger climbing ability and more stable and reliable quality, making this model the highest-configured product among similar models.

This series of drilling rigs is a high-cost-performance DTH drill launched by the drilling machinery company, featuring high configuration, comprehensive functions, and moderate market pricing. The machines have now completed various tests and are in mass production.