GD85A Cast Iron Change Gear 3/4"-16 Thread Click here for spec sheet:

Click here for spec sheet: NAPA Spec Sheet

Click here for spec sheet: SAP Spec Sheet

worms and worm gears operating together must have the same diametrical pitch and threads

the SNASTRS has an eccentric locking bearing insert

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

GD85A Cast Iron Change Gear 3/4"-16 Thread Click here for spec sheet:Boston 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