The Hydraulic Cylinder (OEM Part No. 3128319021) is a spare part compatible with S7D, 235 rock bolting rigs, Boltec-MC, Boomer-MD, and S7D-1 underground drilling equipment. Manufactured from durable alloy steel, it is categorized as a hydraulic component used in the hydraulic actuation system at the boom and feed beam movement position. This cylinder converts hydraulic pressure into controlled mechanical movement, providing accurate positioning and powerful operation during drilling and bolting processes. Designed for heavy-duty mining applications, it ensures reliable performance, smooth movement control, and extended service life of underground drilling machinery.