supply of manufacturing and supply of i) bolt and nut of size 25 x 300 mm to rdso drg no. t-11525 ,ii) bolt and nut of size 25 x 340 mm to rdso drg no. t-11529 , manufacturing and supply of bolt and nut of size 25 x 300 mm to rdso drg no. t-11525 (alt . 2) as per irs specification no.t.23-2021 (track bolts and nuts) along with one spring washer as per is: 30 63 -1994 (reaffirmed year: 2021) and one plain washer as per is: 2016 - 1967 (reaffirmed year: 2021) [ warranty period: 30 months after the date of delivery ] ] , manufacturing and supply of bolt and nut of size 25 x 340 mm to rdso drg no. t-11529 (alt . 2) as per irs specification no.t.23-2021 (track bolts and nuts) along with one spring washer as per is: 30 63 -1994 (reaffirmed year: 2021) and one plain washer as per is: 2016 - 1967 (reaffirmed year: 2021) [ warranty period: 30 months after the date of delivery ] ]