What is the meaning of 12.9 in 'steel grade 12.9'? - Quora
Steel Structures Design - The grades of bolt in common use, a- Ordinary bolts Grades 4.6, 4.8, 5.6, 5.8, and 6.8 and includes foundation bolts, are made from mild steel. b- Heat
Table 2 from Tensile Behaviour of Galvanised Grade 8.8 Bolt Assemblies in Fire | Semantic Scholar
Grade 8.8 Bolts and High Tensile Class 8.8 Hex Nuts/ Studs/ Threaded Rod
Mechanical Properties of Steel Bolts with Different Diameters after Exposure to High Temperatures | Journal of Materials in Civil Engineering | Vol 31, No 10