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 34 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 HUB LENGTH THRU 0.716 in BORE RANGE [MAX] 2 1/4 in BORE TYPE Reborable HUB DIA. 3 1/4 in SERIES B CHAIN PITCH 1/2 in BORE RANGE [MIN] 5/8 in INCH/METRIC Inch LENGTH THROUGH BORE 1 in NO. OF STRANDS ACROSS 1 OUTSIDE DIA. [MIN] 5.7000 in CALIPER DIAMETER 5.11 in OUTSIDE DIA. 5.7000 in CHAIN NO. 40 NO. OF TEETH 34 HARDENED TEETH Without Hardened Teeth MARTIN NO. 40B34 CONSTRUCTION Welded MATERIAL Steel PITCH DIAMETER [MIN] 5.420 in SPROCKET STYLE B WIDTH ACROSS TEETH 0.28 in KEYWAY No Keyway or Setscrew PITCH DIAMETER 5.420 in WEIGHT 3.3 LB EAN OR UPC 697950006253