Boston Bevel Gears are designed for the transmission of motion and power between two intersecting shafts positioned at a right angle. Bevel Gears are similar to Miter Gears except Bevel Gears are used for 1.5:1 to 6:1 ratios. Straight tooth Bevel Gears are cut with a generated “Coniflex” tooth form providing increased life and quieter operating conditions. Spiral tooth Bevel Gears are better suited for higher speeds and high torque applications. And don’t forget Boston Gear Guaranteed Same Day Shipment program – revolutionary premium free guaranteed same day shipment for in-stock items.Straight/Spiral ToothStraight ToothRatio2:1Product FamilyBevel Gears (Straight & Spiral)Diametrical Pitch8Bore Size1.000Product DescriptionBevel Gear, 8 DP, 20 PA, 2:1 R, 20 Teeth, SteelAltra Master No.30216836MaterialSteel, Hardened TeethMating GearHL156Y-G / 2:1 RatioUPC781711118887Family Id30,016Weight2.001KWY/Setscrew/OtherW/ KWY & SetscrewPitch Diameter2.500Outside Diameter2.800No Of Teeth20Mounting Distance4.000Unit Of MeasureEnglish