supply of transition screw couplingtransition screw coupling,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 ]