Hexagon Head Bolt To Is 1363 : Part-1 : 2023 %U2013 M16X180Mm %U2013 8.8, Along With Hexagon Nut To Is 1363 : Part-3 : 2018 %U2013 5, Suitable With A Prevailing Torque Nut For Ensurin G Enhanced Locking And Resistance To Loosening Under Vibration And Dynamic Loads For Fitting The Upper And Lower Cup Sleeves In Schaku Coupler Assembly. [ Warranty Period: 30 Months After The Date Of De Livery ] ]