supply of set of bolt and washer , set of bolt and washer for hhp locomotive compressor mounting as follows : 1) bolt he x head 3/4-10 x 2-3/4 to emd part no. 271774 and dlw part no. 19019117 as per drawing number 27 1774 or latest. qty- 01/set. 2) washer flat 13/16 to emd part no. 8293623 and dlw part no. 1939134 1 as per drawing number 8293623 rev. a or latest. qty- 01/set. 3) washer special 13/16 to emd part no. 8140912 and dlw part no. 19394070 as per drawing number 8140912 rev. fd or latest qty- 01/s et. drawing attached. note: to be procured from past proven supplier to indian railways for this item. test certificate (tc) & a guarantee certificate (gc) is also required from the supplier. ]