From old stock. Had some rust and staining and I cleaned it up a bit. Has never been on a machine.Buyer will receive the sprocket shown. 40 Chain Number 1 Strand 20 Teeth Without Hardened Teeth B Sprocket Style DESCRIPTION Maximum bores shown will accommodate standard keyseat and setscrew over keyseat. Slightly larger bores are possible with no keyseat, shallow keyseat, or setscrew at an angle to keyseat. FEATURES Tolerances meet or exceed ANSI standards Manufactured of high carbon steel Precise machining and processes ensure consistent finish and high quality Bores are concentric to pitch line, minimizing run out SPECIFICATIONS MATERIAL Steel OUTSIDE DIA. 3.4600 in PITCH DIAMETER [MIN] 3.200 in CHAIN PITCH 1/2 in HUB DIA. 2.63 in SERIES B BORE STYLE Minimum Bore OUTSIDE DIA. [MIN] 3.4600 in CONSTRUCTION Solid BORE TYPE Reborable NO. OF TEETH 20 KEYWAY No Keyway or Setscrew LENGTH THROUGH BORE 1 in WIDTH ACROSS TEETH 0.28 in HARDENED TEETH Without Hardened Teeth HUB LENGTH THRU 0.716 in PITCH DIAMETER 3.200 in SPROCKET STYLE B CHAIN NO. 40 CALIPER DIAMETER 2.88 in MARTIN NO. 40B20 NO. OF STRANDS ACROSS 1 BORE RANGE [MAX] 1.8800 in INCH/METRIC Inch BORE RANGE [MIN] 5/8 in WEIGHT 1.56 LB EAN OR UPC 697950004877