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. rds o/2009/cg-22, rev -01 one coupler set shall consists of the following 1.tight lock coupl er 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 co ndition : 1. maintenance manual in soft copy and hard copy shall be supplied with item. 2.n ecessary test certificates as per rdso.specn.no. rdso/2009/cg-22 (rev -01) shall be suppli ed with item. 3. amd-01 of rev.03 or latest revision of specification rdso/2011/cg-03 refer red in rdso/2009/cg-22, rev -01 or latest shall be followed. 4. tenderer to submit rdso app roved drawings at the time of quoting the tender. 5. packing condition: items are to be packed in two different boxes as given below. i. list of items to be in box-1 1. balanced d raft gear with wedge block assembly & wedge block. 2. rear carrier plate 3. fornt carri er plate 4. fasteners for front and rear carrier plates. ii. list of items to be in box-2 1. c oupler head and associated components. 2. main pivot pin. 3. supporting device for coupl er head. 4. fasteners for supporting device. 5. manual coupling device 6. fasteners for m anual uncoupling device. 7. split pins for carrier plate. 8. balance items, if any.. instructions for packing of fasteners. 1. box-1: item-4 2. box-2, item-4,6 & 7/ each to be pa cked a