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 26 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 OUTSIDE DIA. [MIN] 4.4200 in CHAIN NO. 40 CONSTRUCTION Solid SPROCKET STYLE B NO. OF STRANDS ACROSS 1 BORE RANGE [MAX] 2 1/4 in CHAIN PITCH 1/2 in NO. OF TEETH 26 BORE STYLE Minimum Bore PITCH DIAMETER 4.150 in BORE RANGE [MIN] 5/8 in KEYWAY No Keyway or Setscrew CALIPER DIAMETER 3.84 in HUB LENGTH THRU 0.716 in SERIES B LENGTH THROUGH BORE 1 in MATERIAL Steel HUB DIA. 3 1/4 in WIDTH ACROSS TEETH 0.28 in PITCH DIAMETER [MIN] 4.150 in HARDENED TEETH Without Hardened Teeth OUTSIDE DIA. 4.4200 in MARTIN NO. 40B26 INCH/METRIC Inch BORE TYPE Reborable WEIGHT 2.58 LB EAN OR UPC 697950005829