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When used with Boston Gear worms, Boston Gear 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 application requirements. Note: Because the efficiency of a worm gear drive depends on the lead angle and number of starts on the worm, the ratio should be kept low. To run properly, worms and worm gears operating together must have the same diametrical pitch and threads.Mating Worm (Hard)16 DP, Quad ThreadRatio7.5:1Product FamilyWorm GearsDiametrical Pitch16O/P RatingNot RatedProduct DescriptionWorm Gear, 16 DP, 20 PA, 30 Teeth, RH, BronzeAltra Master No.30217613MaterialBronzeBore Size0.313UPC781711135389HandRight HandWeight0.251Flush Face To WM C/L0.156Center Distance1.250Family Id30,065Gear OD2.03Hub Diameter0.750Unit Of MeasureEnglish