supply of supply of bush (part finished) for middle coupling rod.supply of bush (part finished) for middle coupling rod.,bush (part finished) for middle coupling rod of x-class locomotive conforming to drawing no. go c/x/bu-12-00005.(item no -1 only), (1)the material should comply with is 1458/1965 cl iv, as per the details speci fication in the enclosed reference drawing, (2)supplier should provide product material test certificate issued by na bl accredited lab along with each supply, (3) each item should have one integral test piece and is to be parted in p resence of railway inspection authority and handed over for inspection before machining. [ warranty period: 30 months after the date of delivery ] ] => limited