Amacoil/Uhing RS linear drives do not offer pitch control. Pitch in an RS rolling ring linear drive is fixed. The RS comes standard with a pitch setting of 0.5 times the shaft diameter. (The model RS4-25, for example, runs on a 25 mm drive shaft and has a fixed pitch setting of 12.5 mm of travel per shaft revolution.) Each RS drive is also available with four other optional pitch settings: 0.1, 0.2, 0.3 and 0.4 times the shaft diameter. Pitch is determined by pitch wedges installed at the factory.