supply of design manufacture and supply of high tensile aar h type tight lock centre buffer coupler head with transition screw coupling and its associated components for fitment on broad gauge passenger coaches of indian railways as per rdso.specn.no. rdso / 2009 / cg-22, rev -01 one coupler set shall consists of the following 1.tight lock coupler head with transition screw coupling and its associated components 1 no rdso approved firm drgs.. 2.balanced draft gear with pivot pin 1 no rdso approved firm drgs.. 3.supporting device for coupler head with m20 fasteners 1 no rdso approved firm drgs.. 4.manual uncoupling device with m12 fasteners 1 no rdso approved firm drgs.. 5.rear carrier plate for draft gear with m16 fasteners 1 no rdso approved firm drgs.. 6.front carrier plate for draft gear with m16 fasteners 1 no rdso approved firm drgs.. special condition : 1. maintenance manual in soft copy and hard copy shall be supplied with item. 2.necessary test certificates as per rdso .specn .no. rdso / 2009 / cg-22 ( rev -01 ) shall be supplied with item. 3. rev.03 or latest revision of specification rdso / 2011 / cg-03 referred in rdso / 2009 / cg-22 ( rev -01 ) shall be followed. 4. tenderer to submit rdso approved drawings at the time of quoting the tender. [ safety item ] [ warranty period: 84 months after the date of delivery ]