supply of backing ring for upgraded ctrbbacking ring for upgraded ctrb,backing ring for upgraded ctrb, class e 6x11 (narrow jaw) . drawing no:-wd-92089-s- 01, alt. 1, item no. 9 to m/s timken part no. k150050. spec. no.:- ab / rb-40-2016( rev. 2 ) guarante e:- shall be guaranteed for satisfactory performance for a period of 48 months after supply or 36 mo nths after putting in to service, whichever is earlier. (for details please see specn. no. ab/rb-40-2016 , rev. 2) inspection :- i) further all the necessary inspections shall be carried out as per rdso spec. n o. ab / rb-40-2016( rev. 2 ) [ warranty period: 48 months after the date of delivery ] [quantity tolerance (+/-): 5 %age , item category : normal , total po value variation permitt ed: max 8 lacs ] ]