Metrics Series

Generally confirming IS:1364, ISO:4014, DIN 931/933
Thread as per IS:4218, ISO metric6g and property class 10.9 as per IS:1367

Inch Series

Generally conforming to ANSI B 18.2.1 for BS:1083 
Thread UNC 2A as per ANSI B1.1 for BSF BS:84
Mechanical properties grade 8 as SAE J429 for BSF BS:1083

High Strength Structural Bolts

As per IS:3757, property class 10.9
Nuts : IS 6623, Washer : IS 6649