Sandvik 154 115 68 Driver

The driver, part 154 115 68, engages a mating component through its splines or drive faces and turns it, and the load it sees is not smooth because rotation in a rock drill starts, stops and reverses under shock. The contact pattern on the drive faces therefore tells a story, and a driver whose splines are polished only on one flank has been taking torque in one direction while the other side sat idle.

Rounded spline tips, a stepped wear line, or chipped corners on the faces mean the engagement is no longer full, and the remaining contact area carries the same torque on less steel, which accelerates the damage. The mating part is worn by the same process, so it is good practice to inspect both when the driver is changed rather than fit a new one against a worn partner. A driver supplied to the correct reference keeps the spline form and hardness that the original pairing was designed for. Stalroc quotes this Sandvik reference by part number and exports worldwide to mining, quarrying, and drilling contractors.