tender for m.s. black hexagon head bolt with thread m 10, nominal length 25 mm. and property class 4.8,conforming to is: 1363(part 1):2002/iso 4016:1999 (fourth revision) with hexagon nut with thread m10 andproperty class 5,conforming to is:1363 (part iii):2002/iso 4034:1999 (fourth revision).