YI 2472 Brass Internal Spur Gear 0.4375" ID But why settle for a

But why settle for a knock-off when you can have the original - from Boston Gear

KWY/Setscrew/Other: 1/8"Bore= #2-56 setscrew

Boston Gear change gears are used primarily on machine tools to provide different cutting speeds while using a constant speed input

and internal gears

the SNASHA has an eccentric locking bearing insert

YI 2472 Brass Internal Spur Gear 0.4375" ID But why settle for aBoston Gears internal gears are spur gears turned "inside out." In other words, the teeth are cut into the inside diameter while the outside diameter is kept smooth. This design allows for the driving pinion to rotate internal to the gear, which, in turn, allows for clean operation. Intended for light duty applications, these gears are available only in brass. When choosing a mating spur gear, always remember that the difference in the number of teeth