GD40B Cast Iron Change GearBoston Gear change gears are used primarily on machine tools to provide different cutting speeds while using a constant speed input. All Boston Gear change gears are manufactured with a double key to accept the compound steel bushings that connect two gears together, allowing them to spin on an intermediate shaft. The change gears we stock range from 20 tooth through 128 tooth gears, in one tooth increments, depending upon the diametrical pitch, for a

They are spring set and electro-magnetically released

All Stainless Steel

Pressure Angle: 20 Degrees

the ratio should be kept low

Many are available with or without hubs

Click here for spec sheets: SNATF Spec Sheet

Bronze Bearing Type

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

Includes 2 set screws

Ideal for space constrained areas

full-depth system gears

Click here for spec sheet: SBF Spec Sheet