supply of standard sprocket b type, , standard sprocket b type, 1-1/2 inch pitch, 19 teeth with pilot bore 55 mm , pcd ≈ 231 mm, od ≈ 262 mm, hub dia 170 mm, hub length 110 mm, two drilled and tapped holes right angles to each other to size m16 shall be done on the boss.one tapped hole shall be on the keyway. teeth should be flame hardened to 40-45 hrc to 0.4 to 0.6 mm depth, material en-24 note: 1. material test certificate and hardness certificate from nabl/government authorized laboratory sho uld follow the supply 2. warranty -12 months from date of supply. [ warranty period: 12 months after the date of delivery ] ]