Ruland indexing plungers are spring-loaded mechanisms designed to lock devices for adjustable positioning. They are commonly used in industrial equipment for positioning and holding, in gym equipment for height adjustments, in machine guard doors to prevent them from being opened accidentally, and much more. Indexing plungers are comprised of a plastic knob, a hardened steel plunger pin, an internal spring, a black oxide steel threaded body, and a black oxide steel lock nut. The components in the precision indexing plunger use the force in the spring to apply pressure allowing the plunger pin to remain nested in a hole or other receptacle. Thus, two or more elements of equipment can be aligned or fixed into a determined relative position. Ruland indexing plungers feature a pull knob that partially encloses the top of the plunger body, allowing less debris to enter the mechanism. Options with lock-out are available for applications where the plunger pin must not protrude continually. Indexing plungers are offered in three inch sizes: 3/8” – 16 TPI, ½” – 13 TPI, and 5/8” – 11 TPI and three metric sizes: M10x1.0, M12X1.5, and M16X1.5.