Bolts, screws and studs with specified property classes — coarse thread and fine pitch thread

The IS 1367 Grade 8.8 specification covers carbon steel bolts and studs ranging from M-6 to M-39 diameter. We use high carbon steel material and high alloy steel raw materials to achieve the required properties in this standard. There are three popular grades in this standard, 8.8 , 10.9 and 12.9 which denote material hardness strength and their respective mechanical properties. Refer to the Mechanical Properties Chart for the subtle Strength differences within each grade.

8.8		Hex bolts, screws, stud bolts, double ended studs, full thread rods, full threaded studs
10.9		Hex bolts, screws, stud bolts, double ended studs, Stud for foundation, wind energy bolts, Fasteners for wind turbines
12.9		Socket head cap screws, Allen bolts