Supply Of Hexagon Head Bolt To Is 1363 : Part-1 : 2023 - M16x180mm -8.8, Along With Hexagon Nut To Is 1363 : Part-3 : 2018 - 5, Suitable With A Prevailing Torque Nut For Ensuring Enhanced Locking And Resistance To Loosening Under Vibration And Dynamic Loads For Fitting The Upper And Lower Cup Sleeves In Schaku Coupler Assembly..