Parker PEN, PER,PTN,PTR gearheads provide economical servo & stepper motor drive solutions for automation and motion control applications. All Parker planetary gearheads feature fine-hobbed, case hardened, and precision honed gears for maximum reliability. The tapped face PTN and PTR offer an exceptional value with pricing comparable to lower quality spur gears. For applications where space is tight, check out the tapped face right angles for one of the best values in the industry.