GB79B 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

-60° to 180° F temperature range

Design fully engages the thread for secure locking

high impact and abrasion

Design fully engages the shaft without marring

Click here for spec sheets: SUCNPFB Spec Sheet

Click here for spec sheets: SUCNPF Spec Sheet

Allows you room to re-bore the ID without damaging the clamp screws

Click here for spec sheets: BUCTFB Spec Sheet

Click here for spec sheet: SBLF Spec Sheet

Tolerates -60° to 180° F

Click here for spec sheet: HUC Spec Sheet

ANGULAR DISPLACEMENT — Single 45° — Double 90°