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 23 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 BORE RANGE [MIN] 5/8 in NO. OF STRANDS ACROSS 1 BORE RANGE [MAX] 2 in SPROCKET STYLE B CONSTRUCTION Solid MARTIN NO. 40B23 OUTSIDE DIA. [MIN] 3.9400 in MATERIAL Steel PITCH DIAMETER 3.670 in BORE STYLE Minimum Bore PITCH DIAMETER [MIN] 3.670 in LENGTH THROUGH BORE 1 in HUB LENGTH THRU 0.716 in HUB DIA. 3 in NO. OF TEETH 23 HARDENED TEETH Without Hardened Teeth KEYWAY No Keyway or Setscrew OUTSIDE DIA. 3.9400 in CHAIN PITCH 1/2 in INCH/METRIC Inch CHAIN NO. 40 BORE TYPE Reborable CALIPER DIAMETER 3.35 in SERIES B WIDTH ACROSS TEETH 0.28 in WEIGHT 2.13 LB EAN OR UPC 697950005355