20 Tooth 3/4″ Bore 40 Pitch Roller Chain Sprocket 40BS20H-3/4 1-2123-20-C 40 PITCH ANSI ROLLER CHAIN SPROCKET Brand new. ANSI standard 40 pitch roller chain sprocket. Bored to size. One-piece carbon steel forged construction with hardened teeth and black oxide finish. Two set screws. Set screws are located directly over the keyway and 90?? from keyway. Keyway is on center line of tooth. SPECIFICATIONS Pitch 40 Number of Teeth 20 Bore Size 3/4″ Model Number 40BS20H-3/4 Outside Diameter 3.46″ Hub Diameter 2-5/8″ Hub Type B (Hub on one side) Length Through Bore 1″ Keyway Size 3/16″ wide x 3/32″ depth Shpg. 1.33 lbs.