Bolts and other connection fasteners some points A B C grade what it means
The same standard number! Different grades of bolts, their material is not the same! Just their detection method just the same!
Bolts and other fasteners connected due to a wide range of applications, the product level requirements are different, so the bolt product grade is divided into A, B, C three grades. One of the most accurate A, C level of the most inaccurate, B between the two. Class A is used for important applications where assembly accuracy is high and subject to greater impact, vibration or variable loads. Class A for d = 1.6-24mm and l ≤ 10d or l ≤ 150mm bolts. B grade for d> 24mm or l> 10d or l ≥ 150mm bolts, thin rod B grade M3-M20 hexagonal flange bolts, anti-loose performance better. Class C is between M5 and M64.
Grade is not the same, the tolerance range is not the same, A-level tolerance of the smallest, C-class tolerance of the largest
