bids are invited for 1.the half casing and toothed hub shall be made of steel conforming to 45c8 of is 2004: 1991 ( r2016 ) ‘ carbon steel forging for general engineering purposes – specification ’ and shall be heat treated to a hardness bhn 240-280. ( 02 nos. ) 2.the half casing shall be interchangeable alternatively steel casting of equivalent quality { see is : 2707-1996 ( r2002 ) ‘ carbon steel castings for surface hardening purposes ( fourth revision ) } ’ may also be used for the manufacture of couplings, provided it is specifically agreed to between the supplier and the user ( 06 nos. ) 3.the gear teeth shall be cut by module cutters only. the teeth characteristics including crowning and barrelling shall be as agreed to between the supplier and the user ( 04 nos. ) 4.the toothed hubs and the covers shall be machined all over for balancing. the couplings shall be fitted with suitable grease nipples for lubricating the teeth and grids. suitable seals shall be fitted to prevent leakages of lubricants ( 04 nos. ) total quantity : 16