RS linear drives are now available with five linear pitch settings and adjustable axial thrust. This permits varying pitch/thrust combinations until optimum settings are achieved. Optimizing pitch and thrust settings results in very smooth linear movement making the drives ideal for metrology applications and other linear motion processes requiring backlash-free, smooth movement. Pitch, or the distance moved per shaft revolution, may be specified at 0.1, 0.2, 0.3, 0.4 or 0.5 times the shaft diameter. Changes to pitch require no re-gearing or adjustment to motor speed, nor do any other components of the linear motion system need to be changed. RS linear drives are available in seven sizes for shaft diameters measuring 10 mm to 60 mm. The larger the drive shaft diameter the more thrust the drive has. The drive shaft is threadless and cannot trap debris which facilitates jam-free operation. Depending on size, the drives achieve linear speeds of up to 5 feet per second over distances of up to 13 feet with axial thrust up to 500 lbs.