procurement of spares for bec feeder breaker as per nit , procurement of spares for bec feeder breaker . , sprocket for drive shaft , part no . 40091220 , m/c 23234050122 , sprocket for tail end shaft , part no . 40061002 , m/c 23234050043 , chain drive head assembly , part no . 40090001 , m/c 23234050181 , return shaft/tail end assembly complete with bearing , bearing casing , cover , tension screw and all accessories , part no . 40060000 , m/c 23234050193 , fixed bearing assy/bearing block complete drive end , crusher roll with bearing , part no . 40041600 , m/c 23234020053 , loose bearing assy/bearing block complete non-drive end , crusher roll with bearing , part no . 40041500 , m/c 23234020041 , tension head bow with bolt/tension bolt fortail end ( take up ) left , part no . 40060200 , m/c 23234050016 , tension head bow with bolt/tension bolt fortail end ( take up ) right , part no . 40060300 , m/c 23234050028