DB1260A Bronze Worm Gear 24mm ID They are spring set and

They are spring set and electro-magnetically released

Documentation

Bost-Bronz® bearings are also highly versatile and can be used for production and replacement requirements throughout general industry

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DB1260A Bronze Worm Gear 24mm ID They are spring set andWhen used with Boston Gear worms, Boston Gears worm gears provide effective power transmission in applications requiring high ratio speed reduction in a limited space using right angle (90), non intersecting shafts. They are also the smoothest, quietest form of gearing when properly applied. Boston Gear offers worm gears manufactured from a variety of materials, such as acetal, minlon, bronze, and cast iron to suit your applications requirements.