supply of nitrile bonded rubberised cork gasket for loco transformer conforming is 4253/part ii - 1980 (reaffirmed 1999) : grade : rc 70c very good oil resistance of size id 683mm plus or minus 2mm, od:765mm plus or minus 2mm, thickness 6mm with 18 holes of 14mm dia at equally spaced on 720 pcd , nitrile bonded rubberised cork gasket for loco transformer conforming is 4253/part ii - 1980 (reaffirmed 1999) : grade : rc 70c very good oil resistance of size id 683mm plus or minus 2mm, od:765mm plus or minus 2mm, thickness 6mm with 18 holes of 14mm dia at equally spaced on 720 pcd. item to be procured from 1) m/s.cortica manufacturing (i) ltd., 2) nu-corkproducts pvt., ltd., 3) talbros pvt., ltd., 4) indian cork industries 5) bharat corrub industries llp or from their local agencies only as per rdso tc 076 rev 1 [ warrant y period: 30 months after the date of delivery ] [quantity tolerance (+/-): 1 %age , item category : normal , total po value variation permitted: max 8 lacs ] ]