Martin Sprocket & Gear Martin S820BS 1 1/8UPC: 697950440132 | UNSPSC: 31171707 | GTIN:Gears > Spur GearsMartin Stock Spur Gear, Bored-to-Size External Tooth, 1-1/8 in Bore Dia, 2-3/4 in Outside Dia, 20 Teeth, 8 Diametral Pitch, 2-1/2 in, 1-1/4 in Face Width, Type B, 2-1/8 in Hub Dia, 3/4 in Hub Projection, 2 in Overall Length, 14.5 deg Pressure Angle, 1/4 x 1/8 in Keyway, SteelSpecs:Hub Projection: 3/4 inHub Type: Type BPressure Angle: 14.5 degDiametral Pitch: 8Pitch Diameter: 2-1/2 inNumber of Teeth: 20Keyway Size: 1/4 x 1/8 inFace Width: 1-1/4 inHub Diameter: 2-1/8 inBore Diameter: 1-1/8 inOutside Diameter: 2-3/4 inMaterial: SteelOverall Length: 2 inType: Bored-to-Size External ToothPackaging:Weight: 1.86 lb