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 19 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 STYLE Minimum Bore NO. OF STRANDS ACROSS 1 INCH/METRIC Inch CONSTRUCTION Solid BORE RANGE [MIN] 5/8 in OUTSIDE DIA. [MIN] 3.3000 in HUB DIA. 2 1/2 in HARDENED TEETH Without Hardened Teeth CALIPER DIAMETER 2.72 in NO. OF TEETH 19 MATERIAL Steel HUB LENGTH THRU 0.716 in BORE RANGE [MAX] 1 3/4 in BORE TYPE Reborable PITCH DIAMETER [MIN] 3.040 in SERIES B WIDTH ACROSS TEETH 0.28 in CHAIN PITCH 1/2 in PITCH DIAMETER 3.040 in KEYWAY No Keyway or Setscrew OUTSIDE DIA. 3.3000 in LENGTH THROUGH BORE 1 in SPROCKET STYLE B MARTIN NO. 40B19 CHAIN NO. 40 WEIGHT 1.43 LB EAN OR UPC 697950004648