single coil spring washer conforming to rdso drawing no t 10773 with latest alterations if any as on date of closin g of this e tender this is a safety item specification single coil spring washers shall conform to irs specification irs t 42 2020 re vision 01 with latest corrigendum if any as on closing of this e tender warranty period 30 months after the date of delivery single coil spring washer conforming to rdso drawing no t 10773 with latest alterations if any as on date of